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Low-Temperature-Processed Monolayer Inverse Opal SnO2 Scaffold for Efficient Perovskite Solar Cells
Small ( IF 13.3 ) Pub Date : 2022-10-30 , DOI: 10.1002/smll.202205097
Wenjia Li 1 , Bei Cheng 1 , Peng Xiao 2 , Tao Chen 2 , Jianjun Zhang 3 , Jiaguo Yu 1, 3
Affiliation  

Organic–inorganic halide perovskite solar cells (PSCs) have attracted tremendous attention in the photovoltaic field due to their excellent optical properties and simple fabrication process. However, the recombination of photogenerated electron–hole pairs at the interface severely affects the power conversion efficiency (PCE) of the PSCs. Herein, a monolayer of inverse opal SnO2 (IO-SnO2) is synthesized via a template-assisted method and used as a scaffold for perovskite layer (PSK). The porous IO-SnO2 scaffold increases the contact area and shortens the transport distance between the electron transport layer (ETL) and PSK. Ultraviolet photoelectron spectroscopy and Kelvin probe force microscopy results indicate that the built-in electric field is enhanced with IO-SnO2 scaffold, strengthening the driving force for charge separation. Femtosecond transient absorption spectroscopy measurements reveal that the IO-SnO2 scaffold facilitates interfacial electron transfer from PSK to ETL. Based on the above superiorities, the IO-SnO2-based PSCs exhibit boosted PCE and device stability compared with the pristine PSCs. This work provides insights into the development of novel scaffold layers for high-performance PSCs.

中文翻译:

用于高效钙钛矿太阳能电池的低温处理单层反蛋白石 SnO2 支架

有机-无机卤化物钙钛矿太阳能电池(PSC)由于其优异的光学性能和简单的制造工艺而在光伏领域引起了极大的关注。然而,界面处光生电子-空穴对的复合严重影响 PSC 的功率转换效率 (PCE)。在此,通过模板辅助方法合成单层反蛋白石 SnO 2 (IO-SnO 2 ),并将其用作钙钛矿层 (PSK) 的支架。多孔IO-SnO 2支架增加了接触面积并缩短了电子传输层(ETL)和PSK之间的传输距离。紫外光电子能谱和开尔文探针力显微镜结果表明,IO-SnO 2支架增强了内置电场,增强了电荷分离的驱动力。飞秒瞬态吸收光谱测量表明,IO-SnO 2支架促进了从 PSK 到 ETL 的界面电子转移。基于上述优势,与原始 PSC 相比,基于IO-SnO 2的 PSC 表现出更高的 PCE 和器件稳定性。这项工作为开发用于高性能 PSC 的新型支架层提供了见解。
更新日期:2022-10-30
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