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Efficient organic solar cells based on a new a??Y-seriesa?? non-fullerene acceptor with an asymmetric electron-deficient-core
摘要： Herein, a new “Y-series” non-fullerene acceptor, Y21, bearing an asymmetric electron-deficient-core (DA’D) and fluorinated dicyanomethylene derivatives as flanking groups, was designed and synthesized for organic solar cell applications. Rather than being perfectly C2 symmetric manner of the traditional “Y-series” acceptor, Y21 possesses an electron-withdrawing unit (A’) shifted from the center of DA’D, turning into an asymmetric molecular geometry. Photovoltaic devices based on PM6:Y21 can realize a high Jsc of 24.9 mA cm-2, and a PCE of 15.4 %. Our work demonstrates a new way to tune the photoelectronic property of the “Y-series” NFAs.
关键词： non-fullerene acceptor,Y-series,asymmetric electron-deficient-core,organic solar cells,photovoltaic performance
更新于2025-09-19 17:13:59
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Highly Efficient CsPbBr3 Planar Perovskite Solar Cells via Additive Engineering with NH4SCN
摘要： Improving stability is a major aspect of the commercial application of perovskite solar cells (PSCs). The all inorganic CsPbBr3 perovskite material has been proven to have excellent stability. However, the CsPbBr3 film has a small range of light absorption and a serious charge recombination at the interface or inside the device, so that the power conversion efficiency is still lower than that of the organic-inorganic hybrid one. Here, we successfully fabricate high quality CsPbBr3 film via additive engineering with NH4SCN. By incorporating NH4+ and pseudo-halide ion SCN? into precursor solution, a smooth and dense CsPbBr3 film with good crystallinity and low trap state density can be obtained. At the same time, the results of a series of photoluminescence and electrochemical analyses including electrical impedance spectroscopy, space-charge limited current method, Mott-Schottky data, and so on, reveal that the NH4SCN additive can greatly reduce trap state density of the CsPbBr3 film, and also effectively inhibit interface recombination and promote charge transport in the CsPbBr3 planar PSC. Finally, the CsPbBr3 planar PSC prepared with molar ratio of 1.5 % NH4SCN achieves a champion efficiency of 8.47 %, higher than the pure one (7.12 %).
关键词： Additive engineer,Planar perovskite solar cells,CsPbBr3,Photovoltaic performance,NH4SCN
更新于2025-09-19 17:13:59
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Photovoltaic performance of one axis multiple-position sun-tracked PV panels
摘要： In this article, the photovoltaic performance of one-axis multiple-positions sun-tracked photovoltaic panels (MP-PV) is investigated based on solar geometry and dependence of photovoltaic conversion efficiency on the incident angle (IA) of solar rays on PV panels. For such PV system, the azimuth angle (AZA) of PV panels is daily adjusted several times (M) from eastward in the morning to westward in the afternoon by rotating PV panels about inclined north-south axis (INSA) to ensure the projected incident angle (PIA) of solar rays on the plane perpendicular to INSA is always less than the specified angle θa. Results show that, the annual electricity generation (AEG) of MP-PV increases with the increase of M, but such increase is not noticeable when M>5. For MP-PV with the tilt-angle (β) of INSA being yearly fixed (1T-MP-PV), the optimal θa of 3P-,5P- and 7P-PV for maximizing AEG are respectively 24o, 15o and 11.5o, and their AEGs are respectively about 92%, 94% and 95% of that from similar 2-axis tracked PV panels (2A-PV). Whereas for MP-PV with the β being yearly adjusted four times at three tilts (3T-MP-PV), the optimal θa of 3P-, 5P- and 7P-PV are respectively about 22.5o, 14.5o and 11o, and the Pa are respectively about 96%, 98% and 99% of that of similar 2A-PV systems.
关键词： photovoltaic conversion efficiency,azimuth angle,annual electricity generation,solar geometry,sun-tracked PV panels,incident angle,photovoltaic performance
更新于2025-09-16 10:30:52
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Highly stable and efficient planar perovskite solar cells using ternary metal oxide electron transport layers
摘要： In planar perovskite solar cells, the electron transport layer (ETL) plays a vital role in effective extraction and transportation of photogenerated electrons from the perovskite layer to the cathode. Ternary metal oxides exhibit excellent potentials as ETLs since their electrical and optical properties are attunable through simple compositional adjustments. In this paper, we demonstrate the use of solution-processed zinc oxide (ZnO) and zinc tin oxide (ZTO) films as highly efficient ETLs for perovskite solar cells. We observe poor compatibility between ZnO and perovskite which impedes device reproducibility, stability, and performance unlike ZTO ETL devices. Furthermore, we modify the ZTO/perovskite interface by introducing a thin passivating SnO2 interlayer. The Zn1Sn1Ox/SnO2 ETL device demonstrates paramount power conversion efficiency (PCE) of 19.01% with corresponding short circuit current density (Jsc), open circuit voltage (Voc), and fill factor (FF) values of 21.93 mA cm?2, 1.10 V, and 78.82%. Moreover, the Zn1Sn1Ox/SnO2 ETL device displays superior stability, maintaining 90% of its initial PCE after 90 days in the absence of encapsulation at relative humidity of 30–40%. Enhancement in charge extraction, favourable energy alignment, and reduction in recombination sites greatly contribute to the optimal performance, stability, and reproducibility of the Zn1Sn1Ox/SnO2 ETL device.
关键词： Photovoltaic performance,Zinc tin oxide,Electron transport layer,Perovskite solar cells,Long-term stability
更新于2025-09-16 10:30:52
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Solution processed CuSCN/perylene hole extraction layer for highly efficient and stable organic solar cells
摘要： In this work, we report a solution processed hole extraction layer (HEL) for highly efficient organic solar cells (OSCs), which is formed by CuSCN and perylene. It shows that the introduction of perylene helps to polish the interface between HEL and active layers, leading to efficient charge transport and collection, diminished recombination loss, and thereby improving the photovoltaic performance. In poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b; 4,5-b]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)]:[6,6]-phenyl C71-butyric acid methyl ester (PTB7-Th:PC71BM) based OSCs, over 9% enhancement of power conversion efficiency (PCE) is obtained in the cells using bilayer CuSCN/perylene as HEL compared with that of the reference cell using pure CuSCN as HEL. The advantage of bilayer CuSCN/perylene HEL is also confirmed in nonfullerene system. An improved PCE is also obtained after application of perylene in nonfullerene system based cell. Furthermore, superior air stability has been observed in CuSCN and CuSCN/perylene HEL based cells. The use of a bilayer CuSCN/perylene HEL proves a potential approach to obtain efficient and stable OSCs.
关键词： Hole extraction layer,Photovoltaic performance,CuSCN,Perylene,Organic solar cells
更新于2025-09-16 10:30:52
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Enhanced performance of tin-based perovskite solar cells induced by an ammonium hypophosphite additive
摘要： As a promising lead-free perovskite candidate, tin-based halide perovskites such as FASnI3 have attracted extensive attention recently in photovoltaic applications. However, the relatively low e?ciency and poor long-term stability of tin-based perovskite solar cells hinder their practical applications. Here, ammonium hypophosphite is introduced into the FASnI3 perovskite precursor to suppress the oxidation of Sn2+ and assist the growth of perovskite grains, leading to improved perovskite ?lm quality and reduced defect density, and consequently, the device e?ciency and open circuit voltage are substantially improved. More importantly, the solar cells exhibit pronounced enhancement of the long-term stability. This work provides a facile approach for improving the performance of tin-based perovskite solar cells by introducing ammonium hypophosphite as an antioxidant agent in the precursor solution.
关键词： ammonium hypophosphite,tin-based perovskite,solar cells,photovoltaic performance,antioxidant
更新于2025-09-16 10:30:52
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Introducing an identical benzodithiophene donor unit for polymer donors and small-molecule acceptors to unveil the relationship between the molecular structure and photovoltaic performance of non-fullerene organic solar cells
摘要： The side-chain conjugation strategy is adopted in the synthesis of heptacyclic non-fullerene electron acceptors, ITIC2, ITIC-S, and ITIC-SF, for application in organic solar cells (OSCs). The new ITIC-SF molecule features a BDT-SF building block which is the electron-donating component in the widely used donor PBDB-T-SF. Compared with ITIC-S without fluorine substituents, fluorination weakens the crystallinity of ITIC-SF, while the intermolecular interaction between the PBDB-T-SF donor and ITIC-SF acceptor, containing the same BDT-SF building block, results in the increased crystallinity of the corresponding blend films. The OSC based on PBDB-T-SF:ITIC-SF exhibits a champion power conversion efficiency (PCE) of 12.1%, higher than the PCE of 10.1% for the device based on PBDB-T-SF:ITIC2 and the PCE of 11.6% for the device based on PBDB-T-SF:ITIC-S. The better photovoltaic performance of the OSC based on PBDB-T-SF:ITIC-SF is benefitted from the weaker bimolecular recombination and more efficient charge transfer and extraction of the device. The structure–property relationship of the non-fullerene acceptors revealed in this work will play an important role in instructing the molecular structure design of high performance photovoltaic materials for the development of OSCs.
关键词： organic solar cells,non-fullerene acceptors,side-chain conjugation,photovoltaic performance,fluorination
更新于2025-09-16 10:30:52
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Performance evaluation of 12?kW <sub/>P</sub> rooftop grid-connected photovoltaic plant installed under net metering in Delhi, India
摘要： This paper presents the performance analysis of 12 kWP rooftop grid-connected photovoltaic (PV) plant installed under net metering Regulation of State Electricity Regulatory Commission in Delhi, India. The analysis is based on the evaluation of various performance parameters such as monthly average reference, array and final yield of PV plant. The highest values of monthly average reference, array and final yield of 4.67, 4.15, and 4.06 h/d, respectively, were recorded for the duration of the analysis. The total annual energy generation for the place is 1147 kWh/kWp. This computes to 13.1% annual average utilisation capacity of the plant. Additionally, the performance ratio of Delhi is observed to be the highest (between 85 and 93%) among other existing PV plant locations.
关键词： solar energy,net metering,Photovoltaic,performance ratio
更新于2025-09-16 10:30:52
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Numerical analysis of the effect of MoS2 interface layers on copper-zinc-tin-sulfur thin film solar cells
摘要： MoS2 interface layers are often present in high-temperature sulfurized Cu2ZnSnS4 (CZTS) solar cells, but their effects remain poorly characterized. In this study, the effect of MoS2 on CZTS solar cells was analyzed in simulation. Meanwhile, the quantum confinement effects of MoS2, that is, the varied band gap of MoS2 with the thickness of MoS2 have been considered. When the thickness of MoS2 was varied, the performances of CZTS solar cells were improved by the p-type and n-type MoS2 with suitable thickness due to the reduction of band gap, decreasing height of barrier of p-CZTS/MoS2. The barrier was always observed at the MoS2/Mo interface. When the holes recombination velocity of MoS2/Mo interface was changed, the photovoltaic properties of CZTS solar cells were improved by the suitable recombination velocity of MoS2/Mo interface. The simulated results about the effect of MoS2 thickness were consistent with the reported experiment results.
关键词： MoS2,Cu2ZnSnS4 solar cell,Photovoltaic performance,Simulation
更新于2025-09-16 10:30:52
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Influence of active layer thickness on photovoltaic performance of PTB7:PC70BM bulk heterojunction solar cell
摘要： In this paper, we studied the effect of active layer thickness on the photovoltaic performance of inverted bulk heterojunction (BHJ) organic solar cell (OSC). The capacitance-voltage (C–V), dark current-voltage (I–V) and impedance spectroscopy (IS) analysis were carried out to explain the active layer thickness dependence on the photovoltaic performance. The OSC with an active layer thickness of 150 nm achieved the best power conversion efficiency (PCE) of 5.87%, while the OSC of 200 nm active layer thickness yielded the worst PCE. Reduction in the fill factor (FF) was the main reason for the reduction in the PCE at large active layer thickness. The dark I–V analysis revealed large defect density for the OSC with active layer thickness of 200 nm, which raised the charge recombination and leakage current and consequently reduced the FF. IS analysis predicted that the charge transport became the serious limitations for the OSC with 200 nm thick active layer, which can be attributed to the weakening of electric field as well as creation of field-free regions. It mainly caused a drastic drop in the fill factor by reducing the charge collection efficiency, consequently deteriorated the photovoltaic performance.
关键词： Charge recombination,Bulk heterojunction solar cell,Ideality factor,Photovoltaic performance,Charge transport resistance,Leakage current
更新于2025-09-16 10:30:52