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Largea??area Luminescent Downshifting Layer containing Eu3+ Complex for Crystalline Silicon Solar Cells
摘要： The spectral mismatch between the distribution of sunlight (AM1.5G) and crystalline silicon (c-Si) solar cells is one of the most limiting factors for the conversion efficiency of photovoltaic (PV) devices. As an effective solution, luminescent down-shifting (LDS) technique is an important way to improve the short-wavelength response of a solar cell by shifting high-energy photons to the visible range. Herein, large-area (17×17 cm2) luminescent thin film consisting of ternary europium (Eu3+) complex and polyvinyl alcohol (PVA) was successfully constructed through solution casting method, and further developed as an effective LDS layer to improve the photoelectric conversion efficiency of c-Si solar cells with large active area (235 cm2). The self-standing LDS layer is both flexible, transparent and easily attachable to the surface of solar cell module. Compared with the uncoated c-Si solar cell, one coated with LDS layer displayed an enhancement of ~15% in external quantum efficiency (EQE) due to the highly luminescent quantum yield of Eu3+ complex doped inside the layer. These results demonstrate that large area luminescent film embedding Eu3+ complex is a versatile and effective strategy to improve the conversion efficiency of large size PV devices, giving rise to great potential applications as LDS materials.
关键词： Eu3+ complex,luminescent down-shifting,photoelectric conversion efficiency,crystalline silicon solar cells,large-area luminescent film
更新于2025-09-23 15:19:57
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Theoretical and experimental investigations on the bulk photovoltaic effect in lead-free perovskites MASnI <sub/>3</sub> and FASnI <sub/>3</sub>
摘要： Perovskite solar cells based on the lead free hybrid organic–inorganic CH3NH3SnI3 (MASnI3) and CH4N2SnI3 (FASnI3) perovskites were fabricated, and the photoelectric conversion e?ciency (PCE) was assessed. FASnI3's PCE was higher than MASnI3's e?ciency. To study the di?erent photovoltaic properties, we calculated their structural, electronic, and optical properties using density functional theory via the Perdew–Burke–Ernzerhof and spin–orbit coupling (PBE-SOC) methods. The results show that FASnI3 exhibits an appropriate band gap, substantial stability, marked optical properties, and signi?cant hole and electron conductive behavior compared with MASnI3. The interaction of organic cations (FA+) with the inorganic framework of FASnI3 was stronger than that with MASnI3, so they a?ected the band length and band angle distribution, causing the structure of the FASnI3 and MASnI3 to change. The calculations also demonstrated that energy splitting was evident in FASnI3 due to the spin–orbit coupling e?ect, however, it was moderate in MASnI3, which was caused by the H bond e?ect. This research not only furthers the understanding of these functional materials, but also can assist the development of highly e?cient and stable non-lead perovskite solar cells.
关键词： MASnI3,Perovskite solar cells,spin–orbit coupling,lead-free,density functional theory,photoelectric conversion efficiency,FASnI3
更新于2025-09-23 15:19:57
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Commercially Available Jeffamine Additives for pa??ia??n Perovskite Solar Cells
摘要： Commercially available Jeffamines (polyetheramine) with average molecular weights of defects in the grain boundaries of perovskite through the coordination bonding between the nitrogen atom and the uncoordinated lead ion of perovskite. We fabricated p–i–n PSC devices end-capping on the polyether backbone; and propylene oxide (PO) and ethylene oxide (EO) The results indicated that the embedding of Jeffamine additives effectively passivates the Jeffamine)/PC61BM/BCP/Ag. We observed the interaction between the Jeffamine and with the structure of glass/indium tin oxide (ITO)/NiOx/CH3NH3PbI3 (with and without functionality were explored as additives for application in MAPbI3perovskite solar cells (PSCs). 2000 and 3000 g mol–1; one (M2005), two (D2000), and three (T3000) primary amino groups films were studied. The interaction between the additive and perovskite reinforced the 16.8%relative to the control device. Furthermore, the mechanical properties of the perovskite enabled the construction of high-performance p–i–n PSCs. For the Jeffamine-D2000-derived device, we observed an increase in the power conversion efficiency from 14.5% to perovskites. This interaction led to increased lifetimes of the carriers of perovskite, which Keywords: Additive, Defect Passivation, Coordination bonds, Perovskite solar cell, flexibility of the thin film, which may pave the way for stretchable optoelectronics. Photoelectric conversion efficiency
关键词： Photoelectric conversion efficiency,Additive,Coordination bonds,Perovskite solar cell,Defect Passivation
更新于2025-09-19 17:13:59
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The influence of the pyramidal texture uniformity and process optimization on monocrystalline silicon solar cells
摘要： To improve the photoelectric conversion efficiency of monocrystalline silicon solar cells, the influence of the pyramidal texture uniformity on the defects in the monocrystalline silicon cells was analyzed by simulation, and the uniformity of the pyramidal texture was quantitatively characterized with the uniformity coefficient. The texturing process parameters were optimized by fitting and optimizing the uniformity coefficient. In the experiments herein, four groups of textured monocrystalline silicon wafers were obtained by treating them with a 1.2% sodium hydroxide (NaOH) solution for four different times. The uniformity coefficient of each monocrystalline silicon wafer group was obtained. By fitting the uniformity coefficient, we obtained the texturing process parameters corresponding to the maximum uniformity coefficient. The experimental results show that the optimized monocrystalline silicon cell achieved a pyramidal texture with a maximum uniformity coefficient. In addition, the reflectivity of the monocrystalline silicon cell reached a minimum value, and the photoelectric conversion efficiency reached a maximum value. The uniformity coefficient can not only effectively quantify the uniformity of the pyramidal texture but also effectively optimize the texturing process parameters to improve the photoelectric conversion efficiency of monocrystalline silicon cells.
关键词： pyramidal texture uniformity,texturing process optimization,uniformity coefficient,photoelectric conversion efficiency,monocrystalline silicon solar cells
更新于2025-09-19 17:13:59
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A downshifting Eu3+ doped glass embedded with concave pyramid microstructure to improve the efficiency of silicon solar cell
摘要： The average photoelectric conversion efficiency (PCE) of a bare mono crystalline silicon solar cell is 14.71(±0.03)% under AM1.5. It decreases to 14.20(±0.005)% when covering an un-doped flat glass on the solar cell, and it goes down to 14.10(±0.005)% by using a 5 wt% Eu3+ doped glass. The absorptions of the Eu3+ doped CPM glass one-to-one match the excitation spectrum at 362, 381, 393, 400, 413 and 464 nm, which are related to the transitions of 7F0→(5D4, 5G2, 5L6, 5D3), 7F1→5D3, and 7F0→5D2, respectively. In addition, a concave pyramid microstructure (CPM) is embedded in the glass surface to increase light transmittance. The average PCE increases to 14.61(±0.07)% when a 5 wt% Eu3+ doped CPM glass covers on the silicon solar cell. Comparing to the un-doped flat glass, a net increase of the PCE is 0.41%, where the 0.16% increment of PCE is from the lighting trapping of the CPM structure, and the downshifting of near ultraviolet (NUV) light by Eu3+ ion donates the other 0.25% increment. It confirms that the as-prepared Eu3+ doped CPM glass has a good downshifting and antireflection function.
关键词： solar cell,photoelectric conversion efficiency,Eu3+ doped glass,rare earths,concave pyramid microstructure
更新于2025-09-12 10:27:22
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Preparation of novel lead-free Ag-doped glass frit for polycrystalline silicon solar cells by sol-gel method
摘要： A novel Ag-doped glass frit is prepared by the sol-gel method. Nitrogen adsorption-desorption isotherms indicate that the frit has a large BET surface area and a small particle size which promotes front contact metallization. When the glass frit is used for the front contact electrode of polycrystalline silicon solar cells (pc-Si solar cells), it exhibits excellent wettability and etching results on the SiNx layer and the Si substrate. The pc-Si solar cells with the as-prepared frit has a better photoelectric conversion efficiency (18.2%) and is 0.8% higher than the solar cells using the conventional frit, which is due to the frit will produce a lot of Ag nanocrystals at the interface of the glass layer, promoting the formation of excellent ohmic contact between the Ag electrode and n-Si layer, and reducing the contact resistance of solar cells.
关键词： Ag-doped glass frit,polycrystalline silicon solar cells,photoelectric conversion efficiency,sol-gel method
更新于2025-09-12 10:27:22
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Interfacial charge transfer between CsPbBr <sub/>3</sub> quantum dots and ITO nanoparticles revealed by single-dot photoluminescence spectroscopy
摘要： The interfacial charge transfer between single CsPbBr3 perovskite quantum dots (QDs) and indium tin oxide (ITO) is investigated by single-dot photoluminescence spectroscopy. It is found that when the Fermi level of single perovskite QDs aligns with that of ITO nanoparticles, the QD surface cannot be charged by the ITO through interfacial electron transfer. Therefore, the QD/ITO system with Fermi level alignments can exclude exciton nonradiative recombination processes involving the additional surface electrons, such as the exciton Auger recombination and the valence band hole transfer processes. Hence the photovoltaic devices based on perovskite QD/ITO system with the Fermi level alignments have the improved photoelectric conversion efficiency.
关键词： Fermi level alignments,single-dot photoluminescence spectroscopy,photoelectric conversion efficiency,interfacial charge transfer,CsPbBr3 quantum dots,ITO nanoparticles
更新于2025-09-11 14:15:04