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Interface passivation treatment by halogenated low-dimensional perovskites for high-performance and stable perovskite photovoltaics
摘要： The voltage loss which is mainly caused by the nonradiative recombination at the interface has played a serious negative effect on the photovoltaic performance of perovskite solar cells (PSCs). Herein, we firstly designed four halogenated layers by the way of employing different benzylammonium-based aromatic cations for high-performance devices. The introduction of halogen functional groups can not only enhance the hydrophobicity but also optimize the photovoltaic characteristics of LDP which play an important role on passivation effect of the interface between perovskite and hole transport materials (HTM) layer. The films with halogenated LDP passivation layers displayed suppressed nonradiative recombination and reduced trap density, leading to significantly reduced voltage loss. As a result, the optimal devices with 4-bromobenzylammonium-based LDP layer achieved the power conversion efficiency (PCE) as high as 21.13% with an enhanced open-circuit voltage (Voc) of 1.14 V. Under the hydrophobic and buffer action of the halogenated LDP layer, the modified devices showed outstanding long-term stability when exposed to moisture, heat and continuous UV irradiation. This work proves the enhanced passivation effect of LDP layer by regulating the chemical property of introduced organic cations for high-performance and stable perovskite photovoltaics.
关键词： Low-dimensional perovskite,Perovskite solar cells,Halogenated cations,Passivation effect,Photovoltaic performance
更新于2025-09-23 15:21:01
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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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High-performance and moisture-stable perovskite solar cells with a 2D modified layer <i>via</i> introducing a high dipole moment cation
摘要： Recently, perovskite solar cells (PSCs) have represented a significant breakthrough due to their excellent photoelectric properties. However, short lifetime and poor moisture stability make it difficult for PSCs to achieve further application. Here, we have introduced a fluorinated ammonium salt (2,2,2-trifluoro-ethylamine hydroiodide, FEAI) with a high dipole moment to grow a 2D modified layer ((FEA)2PbI4) at the interface of perovskite/HTL. Due to the electronegativity of FEA+, the 2D modified layer brings about an effective passivation effect, leading to reduced interface defect sites and suppressed nonradiative recombination. Moreover, the remarkable hydrophobicity of the 2D modified layer can provide protection of 3D perovskite from moisture erosion but not at the expense of efficiency. As a result, based on (FAPbI3)0.85(MAPbBr3)0.15, the FEAI-modified PSCs showed a high power conversion efficiency (PCE) of 19.24%, with an open-circuit voltage (Voc) of 1.08 V, a short circuit current density (Jsc) of 22.65 mA cm?2 and a fill factor (FF) of 78%. After aging under a relative humidity of 50 ± 5% for 60 days, the modified PSCs retain 88% of their initial PCE. Our work provides a valuable strategy to prepare a 2D perovskite modified layer with a high dipole moment cation for high-performance PSCs with superior moisture stability.
关键词： 2D modified layer,moisture stability,perovskite solar cells,passivation effect,high dipole moment cation
更新于2025-09-12 10:27:22