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Simulation and optimization of CH3NH3SnI3 based inverted perovskite solar cell with NiO as Hole transport material
摘要： A planar perovskite solar cell (PSC) with p-i-n inverted structure is modeled and simulated using SCAPS software to determine the power output characteristics under illumination. The inverted structure is NiO/CH3NH3SnI3/PCBM where NiO is the hole transport layer (HTL), CH3NH3SnI3 is the perovskite absorber layer and PCBM is the electron transport layer (ETL). Simulation efforts are focused on thickness of three layers, defect density of interfaces, density of states, and metal work function effect on power conversion ef?ciency (PCE) of solar cell. For optimum parameters of all three layers, ef?ciency of 22.95% has been achieved. From the simulations, an alternate lead free inverted perovskite solar cell is introduced.
关键词： Electron transport material,Transparent conducting oxide,Inverted perovskite solar cell,Hole transport material,Device simulation,Defect density
更新于2025-09-23 15:19:57
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Bifunctional Ultrathin PCBM Enables Passivated Trap States and Cascaded Energy Level toward Efficient Inverted Perovskite Solar Cells
摘要： Inverted perovskite solar cells (PSCs) with C60 framework are known for their common drawback of low power conversion efficiency (PCE) < 20% because of non-radiative recombination and inefficient charge transport at their perovskite interfaces. Here, we report an ultra-thin [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as a cap layer on perovskite films to overcome this issue. Such a functional cap layer efficiently passivates trap states and establishes a gradient energy level alignment onto perovskite, facilitating the efficient charge transfer and extraction. The as-fabricated inverted PSCs capped with such ultra-thin PCBM exhibit a record PCE of 20.07%. After the storage under N2 atmosphere for more than 500 hours, the PCE of PSCs retains over 85% of its initial level. Our work provides an effective method to upgrade inverted PSCs with the C60 framework with improved efficiency and stability.
关键词： Defect passivation,Cascaded energy level,Interface Engineering,Inverted Perovskite solar cell,Ultra-thin PCBM,High efficiency
更新于2025-09-19 17:13:59
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Effects of interfacial energy level alignment on carrier dynamics and photovoltaic performance of inverted perovskite solar cells
摘要： Metal doping is an efficient method for optimizing NiOx as hole transport material in the inverted perovskite solar cells, which can contribute to the optimization of the interfacial energy level alignment, while the underlying influencing mechanism on the charge carrier dynamics and device performance needs to be further elucidated. In this work, NiOx films with modulated energy levels are obtained via Li doping and examined by ultraviolet photoelectron spectrometer. The effects of the energy level alignment of NiOx on the carrier transfer and recombination dynamics are elucidated by transient photovoltage/photocurrent and transient fluorescence dynamics. The Li doping can significantly shift the valence band of NiOx downward, and the 4% Li content endows NiOx with the optimal energy level matching with perovskite and the best charge separation/transfer ability, which can be confirmed through the photoluminescence results. The corresponding device possesses superior photovoltaic parameters with the champion power conversion efficiency of 17.34%, 37% higher than device based on pure NiOx. The results highlight that proper metal doping can optimize the energy level of the hole transport material to well match the perovskite, thus efficiently promoting charge separation and inhibiting charge recombination, which leads to the enhancement of the device performances.
关键词： Li-doped NiOx,Inverted perovskite solar cell,Charge transport/recombination dynamics,Energy level alignment
更新于2025-09-19 17:13:59
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A Selfa??Assembled Small Moleculea??Based Hole Transporting Material for Inverted Perovskite Solar Cells
摘要： Hybrid organic-inorganic perovskite solar cells have recently emerged as one of the most promising low-cost photovoltaic technologies. The remarkable progress of perovskite photovoltaics is closely related to interfacial engineering and development of charge selective interlayers. Herein we present the synthesis and characterization of a fused azapolyheteroaromatic small molecule, namely anthradi-7-azaindole (ADAI), with outstanding performance as hole transporting layer in perovskite solar cells with inverted architecture. Its molecular arrangement, induced by hydrogen bond-directed self-assembly, favors a suitable morphology of layer, reducing recombination as revealed by light intensity dependence, photoluminescence and electroluminescence studies.
关键词： inverted perovskite solar cell,self-assembled conjugated molecule,undoped hole transport layer
更新于2025-09-16 10:30:52
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Fluorinated fulleropyrrolidine as universal electron transport material for organic-inorganic and all-inorganic perovskite solar cells
摘要： [6,6]-Phenyl-C61-butyric acid methylester (PC61BM) has been widely used as electron transport material (ETM) for both organic-inorganic hybrid and all inorganic perovskite solar cells (PeSCs) with inverted structure. However, PC61BM still remains to be improved due to its low electrical conductivity and inferior passivation effect towards perovskite. In this work, we synthesize two perfluorophenyl-substituted fulleropyrrolidines, 2-(perfluorophenyl)-5-phenyl-C60-fulleropyrrolidine (FP-i) and 2,5-bis-(perfluorophenyl)-C60-fulleropyrrolidine (FP-ii) via a modified 1,3-dipolar cycloaddition reaction. FP-i and FP-ii are introduced into inverted PeSCs based on organic-inorganic hybrid and all inorganic perovskites (CH3NH3PbCl3-xIx and CsPbI2Br) as ETMs. The PeSCs based on FP-i and FP-ii display good photovoltaic performance and device stability, which are superior or comparable to those with PC61BM. The mechanism studies reveal that FP-i and FP-ii possess higher electrical conductivity, more significant passivation capacity and enhanced hydrophobicity but slightly lower low unoccupied molecular orbital (LUMO) levels. These results suggest that FP-i and FP-ii are universal ETMs for both organic-inorganic hybrid and all inorganic PeSCs, which are better or comparable to conventional ETM of PC61BM.
关键词： Inverted perovskite solar cell,Fullerene derivative,Passivation effect,Device stability,Electron transporting layer
更新于2025-09-16 10:30:52
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Enhanced Efficiencies of Perovskite Solar Cells by Incorporating Silver Nanowires into the Hole Transport Layer
摘要： In this study, we incorporated silver nanowires (AgNWs) into poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) as a hole transport layer (HTL) for inverted perovskite solar cells (PVSCs). The e?ect of AgNW incorporation on the perovskite crystallization, charge transfer, and power conversion e?ciency (PCE) of PVSCs were analyzed and discussed. Compared with neat PEDOT:PSS HTL, incorporation of few AgNWs into PEDOT:PSS can signi?cantly enhance the PCE by 25%. However, the AgNW incorporation may result in performance overestimation due to the lateral charge transfer. The corrosion of AgNWs with a perovskite layer was discussed. Too much AgNW incorporation may lead to defects on the interface between the HTL and the perovskite layer. An extra PEDOT:PSS layer over the pristine PEDOT:PSS-AgNW layer can prevent AgNWs from corrosion by iodide ions.
关键词： PEDOT:PSS,inverted perovskite solar cell,hole transport layer,silver nanowire
更新于2025-09-11 14:15:04