Solar energy is one of the most demanding renewable sources of electricity. Electricity production using photovoltaic technology not only helps meet the growing demand for energy, but also contributes to mitigating global climate change by reducing dependence on fossil fuels. The level of competitiveness of innovative next-generation solar cells is increasing due to the efforts of researchers and scientists related to the development of new materials, particularly nanomaterials and nanotechnology.
It is noted that the solar cell market is dominated by monocrystalline silicon cells due to their high efficiency. About two decades ago, the efficiency of crystalline silicon photovoltaic cells reached the 25% threshold at the laboratory scale. Despite technological advances since then, peak efficiency has now increased very slightly to 26.6%. As the efficiency of crystalline silicon technology approaches the saturation curve, researchers around the world are exploring alternative materials and manufacturing processes to further increase this efficiency. Polycrystalline and amorphous thin film silicon cells are seen as a serious competitor to monocrystalline silicon cells. However, their disadvantage is their disordered nature which results in low efficiency.
In this paper is a comprehensive overview of various PV technologies that are currently available or will be available in the near future on a commercial scale. A comparative analysis in terms of efficiency and the technological processes used is presented. Over the past few decades, many new materials have emerged that provide an efficient source of power generation to meet future demands while being cost-effective. This paper is a comprehensive study covering the generations of photovoltaic cells and the properties that characterize these cells. Photovoltaic cell materials of different generations have been compared based on their fabrication methods, properties, and photoelectric conversion efficiency.
First-generation solar cells are conventional and based on silicon wafers. The second generation of solar cells involves thin film technologies. The third generation of solar cells includes new technologies, including solar cells made of organic materials, cells made of perovskites, dye-sensitized cells, quantum dot cells, or multi-junction cells. With advances in technology, the drawbacks of previous generations have been eliminated in fourth-generation graphene-based solar cells. The popularity of photovoltaics depends on three aspects—cost, raw material availability, and efficiency. Third-generation solar cells are the latest and most promising technology in photovoltaics. Research on these is still in progress. This review pays special attention to the new generation of solar cells: multi-junction cells and photovoltaic cells with an additional intermediate band.
Recent advances in multi-junction solar cells based on n-type silicon and functional nanomaterials such as graphene offer a promising alternative to low-cost, high-efficiency cells. Currently, multi-junction cells, which benefit from advances enabled by nanotechnology, are breaking efficiency records. They are still quite expensive and represent a complex system, but there are simpler alternatives that may eventually provide a path to the competitiveness of the highest efficiency devices. Another significant advance is being made in the generation of additional energy levels in the band structure of silicon. In both cases, more research evidence, policies, and technology are needed to make them accessible. Therefore, it remains crucial to develop silicon-based technologies. The use of these new solar cell architectures would provide a new direction toward achieving commercial goals. Multi-junction based solar cells and new photovoltaic cells with an additional intermediate energy level are expected to provide extremely high efficiency. The research in this case focuses on a low-cost manufacturing process. Therefore, commercialization of these cells requires further work and exploration.
Nanotechnology and newly developed multifunctional nanomaterials can help overcome current performance barriers and significantly improve solar energy generation and conversion through photovoltaic techniques. Many physical phenomena have been identified at the nanoscale that can improve solar energy generation and conversion. However, the challenges associated with these technologies continue to be an issue when they are incorporated into PV manufacturing. Thanks to initial successes in recent years, nanomaterials are one of the most promising energy technologies of the future and are expected to significantly reform the future energy market. Carbon nanoparticles and their allotropic forms, such as graphene, are expected to offer high efficiency compared to conventional silicon cells in the near future and thus contribute to new prospects for the solar energy market.
This research was funded by the Lublin University of Technology, grant number FD-20/EE-2/708.
P.W. proposed a study on photovoltaic cell generations and current research directions for their development and guided the work. J.P. conducted a literature review and wrote the paper. J.P. and P.W. described further prospects and research directions and outlined conclusions based on the collected literature. P.W. reviewed and edited the work. All authors have read and agreed to the published version of the manuscript.
Informed consent statement, data availability statement, conflicts of interest.
The authors declare no conflict of interest.
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BMC Chemistry volume 18 , Article number: 110 ( 2024 ) Cite this article
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Dye-sensitized solar cells (DSSCs) are an excellent alternative solar cell technology that is cost-effective and environmentally friendly. The geometry, reactivity descriptors, light-harvesting efficiency, molecular radii, diffusion coefficient, and excited oxidation state potential of the proposed complex were investigated. The calculations in this study were performed using DFT/TDDFT method with B3LYP functional employed on the Gaussian 09 software package. The calculations were used the 6–311 + + G(d, p) basis set for the C, H, N, O, Cl atoms and the LANL2DZ basis set for the Re atom, with the B3LYP functional.. The balance of hole and electron in this complex has increased the efficiency and lifetime of DSSCs for photovoltaic cell applications. The investigated compound shows that the addition of the TPA substituent marginally changes the geometric structures of the 2, 2′-bipyridine ligand in the T 1 state. As EDsubstituents were added to the compound, the energy gap widened and moved from E LUMO (− 2.904 eV) (substituted TPA) to E LUMO (− 3.122 eV) (unsubstituted). In the studying of solvent affects; when the polarity of the solvent decreases, red shifts appears in the lowest energy an absorption and emission band. Good light-harvesting efficiency, molecular radii, diffusion coefficient, excited state oxidation potential, emission quantum yield, and DSSC reorganization energy, the complex is well suited for use as an emitter in dye-sensitized solar cells. Among the investigated complexes mentioned in literature, the proposed complex was a suitable candidate for phosphorescent DSSC.
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The core of dye-sensitized solar cells based on solar radiation is the concept of charge distribution at the point of interaction of two materials with different electron movement processes [ 1 ]. Unlike a standard semiconductor that performs both functions, the device constitutes a stage at which the transport of light absorption and charge carrier transport can be isolated [ 2 ]. As a result, DSSCs provide a more practical and financially viable alternative to current p–n junction solar systems. In addition to solid-state devices, dye-sensitized solar cells (DSSCs) are an excellent alternative solar cell technology with cost-effective and environmentally friendly properties [ 3 ]. In a conventional DSSC, light is trapped by a sensitizer (dye) grafted onto the surface of a thin TiO 2 semiconductor film. Charge separation at the sensitizer-TiO 2 interface is caused by the photoinduced movement of electrons from the dye to the conduction band (CB) of the semiconductor. The charge collectors serve to transport the created electron–hole pair to the external circuit. A redox pair structure (often a natural compound such as an iodide/triiodide pair) regenerates the colored particle while it is regenerated by electrons at the counter terminal.
Regardless, in order to work on DSSC exhibition, it is important to explore creative materials such as host materials [ 4 , 5 ]. Since the presence of metal complexes exhibits a strong SOC that significantly accelerates the single-to-triplet intercalation (ISC), we used a third series of d 6 -mediated metal complexes with suitable organic ligands. The creation of highly efficient optical compounds requires the use of organic ligands that allow various electronic transitions between unique energy levels associated with metal atoms [ 6 , 7 , 8 ]. The bidentate heteroaromatic \(\widehat{\text{NN}}\) ligand complexes with d 6 3rd row transition metal ions such as Re(I), Ru(II), and Os(II) exhibit remarkable photophysical properties. Rhenium-containing complexes with 2,2′-bipyridine typically exhibit robust, enduring iridescence. 2,2′-bipyridine is a bidentate ligand with strong interaction for the Re(I). It is easy to change it by adding different groups of substituents at different places. To change the energy level of the 2, 2′-bipyridine ligand and to construct highly efficient DSSCs, it is advantageous to use electron-donating groups such as the TPA substituent [ 9 , 10 ]. The low luminescence efficiency and intrinsic quantum efficiency, on the other hand, are produced by unequal charge carrier for electrons and openings in the discharge layer of the DSSC system. Because these unsubstituted compounds have good electron transfer abilities but poor hole transfers properties [ 11 ]. The authors attempted to solve the problem of low light harvesting efficiency, intrinsic quantum efficiency, and luminescence performance of unsubstituted complexes inside the DSSC gadget by means of a theoretical treatment of the electronic structure design and photophysical characteristics of TPA-substituted of proposed complex.
The geometries of the singlet ground state (S 0 ) and the lowest-lying excited triplet state (T 1 ) of the investigated compound were optimized in the gas phase using the DFT technique [ 12 ]. In addition to the 6–311 + + G(d, p) basis set for C, H, N, O and Cl atoms, the B3LYP exchange correlation functional [ 13 ] can also accurately evaluate the LANL2DZ basis set with double ζ quality for the Re atom. LANL2DZ for Re and 6–311 + + G(d, p) for the premise set of different molecules are also remembered for a complementary contribution within the Gaussian arrangement of the calculation [ 14 ]. Vibration frequency was conducted to ensure that the improved structures were undoubtedly stable structures. Accordingly, they are the smallest points on the potential energy surface with no imaginary frequency for any design. Using the optimal structures, the energy level and contour plot of the HOMO and LUMO of the studied complex were obtained.
Charged state calculations were investigated using the TDDFT approach with respect to a simplified construction of the investigated complex with indistinguishable functional and basis sets [ 15 , 16 ]. The absorption and emission spectra of the complex were estimated using the TDDFT method on the optimized S 0 and T 1 structures. GAMESS software was used to model the absorption spectra of the studied compound to obtain the best spectra. PCM is used in the TDDFT calculation to account for the impact of the solute around the particle. Electron density plots for FMO were generated using Gaussian software. The involvement of positive and negative ions in the production of “electron holes” is key to their use as DSSC materials. Subsequently, the + ve and −ve energy states of the unbiased atom were compared to calculate ionization potentials (IPs), electron affinities (EAs) and reorganization energies. Descriptors of complex reactivity, light harvesting efficiency, molecular radii, diffusion coefficient and excited oxidation potential were calculated using HOMO and LUMO energies. All calculations were performed using the software application Gaussian 09 [ 17 ].
Stable geometries of complex.
The explored complex chemical structure and optimized ground state geometry were demonstrated (Fig. 1 ). Table 1 accumulates exploratory qualities for complex in view of crystallographic information from the previous reported [ 18 ], as well as the examined complex's chosen bond lengths and bond angles in the optimal ground state (S 0 ) and lowest lying triplet state (T 1 ). The geometry is formed by the substituted TPA on the bidentate ligand, CO, and Cl atom around the Re(I) atom. The constancy of the complex's ideal geometries was verified using frequency analyses that reveal that there is no imaginary frequency for any configuration. Figure 1 shows that this complexes via TPA have a similar face octahedral coordination with the bidentate ligand, CO, and Cl around the Re atom. Complexes display normal Re(I) tricarbonyl diamine complex properties in terms of bond lengths and bond angles, as shown in Table 1 .
Complex chemical structure ( A ) and optimized geometry ( B )
Calculated the experimental values obtained from the crystallographic data published in the literature [ 18 ] are in good agreement. It provides strong evidence for the correctness of the theoretical approach. Small differences are observed due to the effects that the theoretical calculations do not take into account in the tightly closed and chemical environment. The study found that EWG caused a red shift in the lowest energy absorption and emission bands, while EDG caused a blue shift, finding can serve as a benchmark to compare the effects of the TPA ligand in this complex [ 19 ]. Although the close-packed lattice gives practical results, the theoretical calculations are valid for the gas phase. Substitution of TPA on the 2,2′-bipyridine ligand results in a small modification of the bond, as seen in Table 1 . For the investigated compounds, the typical angle of approximately 90° between the three CO ligands in fac-Re(CO) 3+ is unity.
In each complex, the axial Re-C bond distance is shorter than the equatorial Re-C bond distance. This is due to the axial CO opposite the Cl atom having a distinct ligand to metal back bonding capacity. The complex's estimated geometrical parameters for the T 1 included in Table 1 and reveals geometric structures of the 2, 2′-bipyridine ligand in the T 1 state are minimally affected by the addition of a TPA substituent. However, there are significant changes in the bond lengths and bond angles of the complex in the T 1 and S 0 states. The bond lengths of Re–N and Re–Cl are particularly shortened, whereas those of Re-C are lengthened. While Re(I) interactions with three CO ligands are weaker in the T 1 state, those with the 2, 2′-bipyridine ligand are greater. As a result, the 2, 2′-bipyridine ligand has a stronger effect on the FMOs of these complexes in the T 1 state. The varied strengths of Re(I) and TPA-2,2′-bipyridine ligands or CO ligands will result in different electron transition characteristics.
Experimental results were taken from the literature [ 18 ]. The calculated optimal parameters suggest an octahedral coordination.
The frontal molecular orbital (FMO) properties of DSSC materials have a substantial effect on their energized states and electronic changes. FMOs, especially HOMOs and LUMOs, are related to the optical properties of the complexes. Contour plots of the HOMO (H) and LUMO (L) energy levels in the complex, as well as the principal FMO energy levels, are shown in Fig. 2 . As can be seen, the studied complex's HOMOs are predominantly made up of the d(Re), p(Cl), and orbitals of CO ligands, while the LUMOs are primarily made up of the TPA-2, 2′-bipyridine ligand’s π* anti-bonding orbitals. The addition of TPA substituent groups to the 2, 2′-bipyridine ligand had no effect on the FMO compositions. When EDG groups (TPA) are introduced, the HOMOs rarely change (Fig. 2 ). When different substituent bunches is joined to the 2, 2′-bipyridine ligand, the energy levels LUMOs vary significantly. The introduction of EDGs (-TPA) increases E LUMO . As electron-donor substituent groups are added, the energy gap of the molecule widens, moving from E LUMO (− 2.904 eV) (substituted by TPA) to E LUMO (− 3.122 eV) (unsubstituted). Contour plot of HOMO and LUMO of studied complexes was shown in Fig. 2 .
Contour plot of HOMO ( A ) and LUMO ( B ) of studied complexes
Furthermore, the quantum chemical parameters HOMO and LUMO are essential for predicting the reactivity of the substance under investigation. Descriptors of chemical reactivity that are important are studied using them, such as ionization potentials (IP), electron affinity (EA), electronegativity (EN), chemical hardness (η), chemical potential (μ), chemical softness (S), electrophilicity index (ω), electron accepting capability (ω + ), electron donating capability (ω − ), Nucleophilicity index (N), additional electronic charge (N max ), and optical softness (σ o ) are some of the terms used to describe the properties of a material [ 20 , 21 ]. The energy of the HOMOs and LUMOs with all global reactivity descriptors of the studied complex was determined using the DFT technique at the B3LYP/6–311G + + (d, p) basis set and is shown in Table 2 .
According to the data, Egap is 2.756 eV, the smallest energy gap among the complexes analyzed in the literature. As a result, a soft molecule has low gap energy, is more polarizable, has high chemical reactivity, and has a low level of kinetic stability. The attachment of TPA to the studied complex has given it a high IP (5.661 eV) and a high electron donating capability (ω − ), which is 8.965 eV, as indicated in Table 2 .
The complex's absorption characteristics have been established using the idealized ground state geometry. To identify the absorption spectra of the complex under study, PCM in CH 2 Cl 2 medium was used in conjunction with the theoretical methods. Table 3 gathers experimental values for complex transition behavior, relevant energies/wavelengths, oscillator strength, dominating orbital excitations with configuration interaction (CI) coefficients, and their assignments from the literature [ 18 ]. Figure 3 depicts the corresponding simulated UV–Visible absorption spectra of the examined chemical using the GAMESS software. UV–Visible absorption spectrum of the studied complex is shown below (Fig. 3 ). Combining MLCT, XLCT, and LLCT, the H-3 to L and H to L + 2 excitations are assigned to the studied complex’s absorption band. The compounds under examination have a reduced energy absorption band of 400 nm. When EDG TPA substituents are added to the 2, 2′-bipyridine ligand (shorter wavelength), the absorption band moves to the blue.
The simulated UV–Vis absorption spectra of the investigated compound
To produce the emission spectra of the complex under study, the TDDFT/B3LYP techniques with PCM in CH 2 Cl 2 medium were applied, beginning with the optimized T 1 structures. Table 4 shows the energy/wavelength relationships, dominating transitions with higher CI coefficients, and their assignments. In Phosphorescence, the addition of the -TPA group to complex may result in a corresponding blue shift. Furthermore, the investigated compound emits light in the visible spectrum. As a result, when a stronger EDG was added to the R positions of the 2, 2′-bipyridine ligand, the spectrum of the lowest energy emission band was blue-shifted. The contour plots of excited state HOMO and LUMO of the complex are depicted (Fig. 4 ).
The contour plots of excited state HOMO ( A ) and LUMO ( B ) of complex
The links between the incoming photon conversion efficiency (IPCE), charge collecting efficiency (c), electron injection efficiency (Φ inj ), and light harvesting efficiency (LHE) have been demonstrated using Eqs. ( 1 ) and ( 2 ) [ 22 ].
where f is the oscillator strength that corresponds to the maximum absorption wavelength (λ max ) in the visible or near-IR range. The absorption wavelengths were plotted against the absorptivity coefficient and oscillator strength ( f ) data to validate the transition strengths. In contrast to epsilon ('molar absorptivity,' which is determined by the molecular weight of the molecule, oscillator strengths provide a more accurate representation of the transition probability for each particular molecule. Electronic transitions in a molecule between ground states and first excited singlet states are expected to be strong because f values represent the degree of the transition strength and likelihood [ 23 ].
E ox Complex , where E is the absorption energy corresponding to the complex's maximum absorption in the visible or near-IR region, and it provides the ground state oxidation potential of the complex. A considerable percentage of the energy released by the excited oxidation state of complex (E ox complex *) [ 22 ] into the TiO 2 Conduction band is thought to come from a diffusion process [ 24 ].
As a result, the diffusion coefficient can be calculated using the Stokes' equation as shown in Eq. ( 4 ). r complex is the molecular radius of the dye (Eq. 5 ), K B is the Boltzmann constant in J/K, T is the lowest temperature in Kelvin (specified at 298.15 K), and is the viscosity of the medium [ 22 ].
Suppan's equation assumes that molecular radii (r dye ) are equal to the dyes’ respective Onsager cavity radii, a, which are calculated from the molecular volume according to Eq. ( 5 ).
where M is the molecular weight of the complex, ρ is the density of the gas (at STP), and N A is the Avogadro’s number. Generally, studied complex photophysicochemical and photovoltaic characteristics were depicted in Table 5 .
The polarity of various solvents varies. Different solvents produce varied excitation energies due to their polarity [ 25 ]. The PCM technique is used to evaluate solvent effects as shown in Table 6 for the complex under consideration. For complex, red shifts have been detected with decreasing solvent polarity in the lowest energy absorption and emission bands, while blue shifts observed in rising solvent polarity. When compared to the experimental technique, changes in solvents are straightforward in theoretical calculations. This is one more benefit of theoretical computations.
They impact how well DSSCs perform. IP and EA are regularly used to evaluate the energy hindrance for the infusion of openings and electrons from the anode into producing materials [ 26 , 27 ]. Vertical and adiabatically stimulated excitations are referred to as EA (v) and EA (a), respectively (a). The electron transport revamping energy (electron), opening vehicle rearrangement energy (opening), and contrast between the electron and opening per complex were resolved involving the DFT procedure in this work and are displayed in Table 7 . Vertical and adiabatically stimulated excitations are referred to as EA (v) and EA (a), respectively (a). The electron transport redesign energy (electron), opening vehicle rearrangement energy (opening), and contrast between the electron and opening per complex were resolved involving the DFT procedure in this work and are shown in Table 7 . However, as demonstrated, the studied complex has a fairly small difference between electrons and holes when compared to an unsubstituted complex, which can improve charge transfer balance and further improve DSSC material efficiency. As a result, the examined chemical is better suitable for use as an emitter in DSSCs.
The conflict between radiative decay rate constant (K r ) and non-radiative decay rate constant (K nr ) might alter the emission quantum yield (Φ) [ 13 ].
where, τ em is the emission decay time. The large K r (Eq. 7 ) and tiny K nr (Eq. 8 ) are required by the preceding formula to improve the value of emission quantum yield (Φ) (Eq. 6 ). The K r and K nr can expressed as:
where α and β are constants, S 1 is the electric dipole moment of transition from S 0 to S 1 . The energy gap between S 1 and T 1 states is denoted by E S1-T1 , the energy of the lowest triplet excited states for phosphorescence is denoted by E T1 , and n, h, and \({\varepsilon }_{0}\) are the refractive index, plank's constant, and permittivity in a vacuum, respectively. As a result of the foregoing formulas, the variation of Φ can be determined qualitatively. According to the preceding equation, when E T1 increases, K r increases and K nr decreases. Table 8 summarizes the associated data. The table shows that complex has the highest E T1 (1.581 eV), which may raise the value of Φ. The SOC effects are mostly explained by the energy difference between the S 1 and T 1 states (E S1-T1 ) [ 28 , 29 ]. The S 1 and T 1 ISC play a significant role in the phosphorescent process [ 30 ]. As ΔE S1-T1 grows the ISC rate decreases exponentially. The minimum E S1-T1 will improve an ISC rate and transition moment, perhaps increasing Kr. Table 8 shows that the studied complex has the high E T1 (1.581 eV), the small value of ΔE S1-T1 (1.174 eV), and large μ S1 (6.3D) As a result, it may have a higher emission quantum yield than other complexes. Among the examined complexes, the developed complex may be a viable choice for phosphorescent materials.
In this study, the geometry, reactivity descriptors, light harvesting efficiency, molecular radii, diffusion coefficient, and excited oxidation potential of fac -[Re(I)(CO) 3 (Cl)(TPA-2, 2′-bipyridine)] were investigated using DFT and TDDFT. S 0 and T 1 state geometries, FMOs, reactivity descriptors, absorption and phosphorescence spectra, solvent effect, electronic affinity, ionization potential, reorganization energy, light harvesting efficiency, molecular radii, diffusion coefficient, excited oxidation potential, and emission quantum yield of the complex under investigation were specifically investigated. The addition of TPA groups to the 2, 2′-bipyridine ligand greatly modifies the electronic structures and photophysical properties such as absorption and emission spectra, charge infusion and move capacities, and emission quantum yield, according to the calculated results. The lowest-energy absorption and emission bands of this complex redden when the solvent polarity decreases, according to the solvent effect on absorption and emission spectra. Based on the results of EA, IP, and reorganization energy, we may also conclude that this complex can be used as an electron transporting material. The chosen photovoltaic properties of the complexes, such as light harvesting efficiency, molecular radii, diffusion coefficient, and excited oxidation potential, indicate the preferred complex in the use of solar cells. Furthermore, the investigated complex has the smallest electron-to-hole disparity of the complexes, which improves the device performance of DSSCs even further. The compound under investigation could have a higher quantum yield. As a result, complex is a preferable choice for usage as an emitter in DSSCs. Finally, theoretical study can afford suitable details for the intention and synthesis of novel, high-efficiency DSSC materials. Because of the TPA, a chemical that transmits holes, this combination has extraordinary light properties.
The data sets used and analyzed during the current study are available from the corresponding author on reasonable request. We have presented all data in the form of Tables and Figures in the manuscript.
Density functional theory
Dye-sensitized solar cells
Electron affinity
Electron donating group
Electronegativity
Electron withdrawing group
Frontier molecular orbitals
Highest occupied molecular orbital
Ionization potential
Los Alamos national laboratory 2 Double zeta
Ligand to ligand charge transfer
Lowest unoccupied molecular orbital
Molecular electrostatic potential
Metal to ligand charge transfer
Nucleophilicity index
Polarizable continuum model
Time-dependent density functional theory
Triphenylamine
Ultraviolet
Halide to ligand charge transfer
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Department of Chemistry, College of Natural and Computational Science, Dambi Dollo University, P. O. Box. 260, Dambi Dollo, Oromia, Ethiopia
Dereje Fedasa Tegegn, Habtamu Zewude Belachew & Shuma Fayera Wirtu
Department of Electrical/Electronics and Computer Engineering, Afe Babalola University, Ado-Ekiti, Nigeria
Ayodeji Olalekan Salau
Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Chennai, Tamil Nadu, India
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Dereje Fedasa has contributed the information collection, methodology, visualization, investigation concept and layout, drafting of the manuscript and Habtamu Zewude and Shuma Fayera has contributed in essential revision of the manuscript for essential highbrow. Ayodeji Olalekan Salau has contributed in the methodology, visualization, investigation, and writing-reviewing and editing.
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Tegegn, D.F., Belachew, H.Z., Wirtu, S.F. et al. Geometry, reactivity descriptors, light harvesting efficiency, molecular radii, diffusion coefficient, and oxidation potential of RE(I)(CO) 3 Cl(TPA-2, 2′-bipyridine) in DSSC application: DFT/TDDFT study. BMC Chemistry 18 , 110 (2024). https://doi.org/10.1186/s13065-024-01218-y
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New recycling method makes solar cells even more environmentally friendly, all the major elements in a solar panel can be reclaimed using less energy..
John Timmer - Jun 4, 2024 9:02 pm UTC
For years, the arguments against renewable power focused on its high costs. But as the price of wind and solar plunged, the arguments shifted. Suddenly, concerns about the waste left behind when solar panels hit end-of-life became so common that researchers at the US's National Renewable Energy Lab felt compelled to publish a commentary in Nature Physics debunking them.
Part of the misinformation is pure nonsense. The primary ingredients of most panels are silicon, aluminum, and silver, none of which is a major environmental threat. Solar panels also have a useful lifespan of decades, and the vast majority of those in existence are less than 10 years old, so waste hasn't even become much of a problem yet. And, even once these panels age out, recycling techniques are available.
Perhaps the only realistic concern is that existing recycling technologies rely on nitric acid and can produce some toxic waste. But a group of researchers from Wuhan University have figured out an alternative means of recycling that avoids the production of toxic waste and is more energy-efficient as a bonus.
As mentioned above, waste from solar panels really isn't a problem yet. The paper's authors describing the new recycling technique note that, at the end of 2020, 18 percent of the solar cells in use had been manufactured that same year, and the pace of manufacturing has accelerated dramatically since. And panels tend not to fail so much as slowly drop in efficiency to the point where installing a new panel makes economic sense.
That said, the number of cells ready for recycling will grow dramatically within a few decades, and there are expected to be 80 million tonnes of panels ready for recycling each year by 2050. So, methods for doing so have already been devised. Most of the value in the solar panels comes in the form of silver used for wiring and the high-purity silicon of the cells. But there's also an aluminum frame and backing, a glass cover with anti-reflective coating, and solder connecting some of the wiring.
Current techniques dissolve the silver in nitric acid and use other acids to handle a silicon nitride layer in the panel, as well as some of the minor materials, like solder. These techniques result in chemicals that are difficult to recycle or dispose of.
The new work, rather than focusing on completely dissolving the materials used in constructing the panel, relies on a brief chemical treatment that largely severs the connections among the individual layers. While this results in some chemical byproducts, most of the material ends up intact and in a relatively pure form.
The process starts with physically removing the aluminum frame and glass cover, both of which can be melted and reused for manufacturing. This leaves the cells, which the researchers disassemble using a molten mixture of sodium and potassium hydroxide, which undergoes chemical reactions with most of the components it comes in contact with. This acts as an etching process, reacting away the material right at the cell's surface.
The researchers tried various conditions, ranging from spraying on the NaOH/KOH mixture to soaking the cells in it and a variety of temperatures. They settled on a two-second dip in the etching mixture, followed by a short (one to two minutes) period at 200° C. Longer treatments and elevated temperatures tended to result in some of the layers of material reacting away completely; the shorter exposure allowed these layers to separate while remaining largely intact.
Channel ars technica.
Solar manufacturers are pushing the limits of solar efficiency. CNET explains what you need to pay attention to if you're shopping for residential solar panels.
A major solar panel manufacturer says its latest cell technology can turn nearly a third of the solar energy that hits it into electricity. That would mean this cell is more efficient than the best residential solar panel on the market .
But if you're shopping for solar panels for your home, you probably shouldn't be concerned about it.
JinkoSolar's perovskite tandem solar cell set a new efficiency record for its specific type of cell, the company announced last week.
Can solar panels save you money?
Interested in understanding the impact solar can have on your home? Enter some basic information below, and we’ll instantly provide a free estimate of your energy savings.
The efficiency rating of 33.24% for an n-type TOPCon-based perovskite tandem cell seems miles ahead of the efficiency rating CNET reported on a few weeks ago when Maxeon announced its new most efficient solar panel , the Maxeon 7, recording just under 25%.
Experts say, however, that the two technologies aren't the same and shouldn't be compared. "Test results on new cells cannot be compared to the real-world efficiency of a currently available commercial panel, especially when they use very different technologies," said Chuck Kutscher , lead author of Accelerating the US Clean Energy Transformation and contributing author to the 2020 Zero Carbon Action Plan by the United Nations Sustainable Development Solutions Network.
Kutscher, who also spent four decades as a renewable-energy researcher at the National Renewable Energy Laboratory , or NREL, said "the Jinko efficiency rating is just for an individual tandem cell consisting of two different cell designs." The Maxeon 7's 24.9% efficiency rating, he said, is for the entire panel with over 100 monocrystalline silicon solar cells wired together.
The Jinko tandem panel is made up of a perovskite layer, which lies on top of the monocrystalline silicon layer . It works by absorbing one part of the solar spectrum from the top layer while the monocrystalline silicon layer absorbs another part of the solar spectrum, said Kutscher.
"Stacking two different cells that collect different portions of the solar wavelength spectrum is a long-recognized way to boost efficiency, but it comes at a higher cost, and so the tandem design of this Jinko cell makes it more expensive than a single cell design typical of residential panels," said Kutscher.
Perovskite cells like the one used in the Jinko Tandem Solar Cell don't have the proven experience in the field and haven't yet demonstrated the long-term durability of silicon cells, said Kutscher.
This is a close-up look at a high-performance solar cell made from a monocrystalline silicon wafer. The contact grid is made from busbars (large strip) and fingers (small strips). When light hits it, it releases electrons, which are converted into an electrical current. A grid of wires collects the electrons. This is what a residential rooftop solar panel looks like.
The bottom line is, efficiency records for individual solar cells are broken all the time. Kutscher says it's the efficiency, durability and cost of an entire solar panel that matter for residential installations. "It's always encouraging to see new efficiency records set for different types of solar cells, but it can take a while for new cells to make it into successful commercial products, and they may never make that transition."
Jinko does make a few different residential solar panels that are available for rooftops now. All have decently high efficiency ratings just above 22%. CNET found the warranties to be mediocre, however.
For more information of which solar panel is the best or which panel is the most efficient , CNET ranks and scores them for you based on criteria such as efficiency, temperature coefficient, wattage and warranty.
The Maxeon 7 , the current reigning most efficient residential solar panel , is expected to be available in the US in the third quarter of 2024, Maxeon said in a press release .
Article updated on June 10, 2024 at 9:00 AM PDT
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The synthesis of zinc oxide nanoparticles (ZnO NPs) through the use of plant extracts is a remarkably simple, cost-effective, efficient, and environmentally friendly approach. In recent years, there has been a surge in the exploration of eco-friendly methods for synthesizing ZnO NPs, with researchers addressing the potential of extracts derived from various plant components, including leaves, stems, roots, and fruits. This comprehensive review aims to encapsulate and delve into the extensive research surrounding the green synthesis of ZnO NPs, emphasizing their diverse antimicrobial applications while encompassing the latest advancements documented in the literature. Furthermore, this review meticulously examines the sizes and morphological characteristics of the synthesized nanoparticles, offering valuable insights into their structural properties. Finally, a thorough exploration of the potential interaction mechanisms between ZnO NPs and bacterial cell walls was conducted, elucidating how such interactions may induce cell death and highlighting the consequential antimicrobial activity exhibited by these nanoparticles.
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D. C. Bouttier-Figueroa acknowledges the postdoctoral position at the Universidad de Sonora.
D. C. Bouttier-Figueroa acknowledges the grant from CONAHCYT.
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D. C. Bouttier-Figueroa & R. E. Robles-Zepeda
Departamento de Investigación en Física, CONAHCYT, Universidad de Sonora, 83000, Hermosillo, Sonora, Mexico
M. Cortez-Valadez
Departamento de Investigación en Física, Universidad de Sonora, 83000, Hermosillo, Sonora, Mexico
M. Flores-Acosta
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DD.C.B.F and M.F.A. wrote the main manuscript text. M.F.A. and R.E.R.Z. reviewed the manuscript.
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Bouttier-Figueroa, D.C., Cortez-Valadez, M., Flores-Acosta, M. et al. Green Synthesis of Zinc Oxide Nanoparticles Using Plant Extracts and Their Antimicrobial Activity. BioNanoSci. (2024). https://doi.org/10.1007/s12668-024-01471-4
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DOI : https://doi.org/10.1007/s12668-024-01471-4
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