六氯锡酸铵促进钙钛矿太阳能电池界面电子转移及其飞秒瞬态吸收光谱研究  

Accelerated Interfacial Electron Transfer in Perovskite Solar Cell by Ammonium Hexachlorostannate Modification and fs-TAS Investigation

作　　者：刘纪舟 艾陈斌 胡晨睿 程蓓[1] 张建军 Jizhou Liu;Chenbin Ai;Chenrui Hu;Bei Cheng;Jianjun Zhang(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Laboratory of Solar Fuel,Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430078,China)

机构地区：[1]武汉理工大学,材料复合新技术国家重点实验室,武汉430070 [2]中国地质大学(武汉),材料与化学学院太阳燃料实验室,武汉430078

出　　处：《物理化学学报》2024年第11期25-26,共2页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(52073223,22278324,52202375);湖北省自然科学基金(2022CFA001)资助。

摘　　要：有机-无机卤化物钙钛矿太阳能电池(PSCs)因其优异的光伏性能(PCE)和简单的制备工艺而受到广泛关注。然而,界面处的电荷复合是制约PSCs光电转换效率进一步提高的关键因素。本文基于旋涂镀膜法利用室温合成的六氯锡酸铵(AH)晶体对钙钛矿薄膜(PSK)和电子传输层之间的界面进行修饰。AH是一种无机锡基钙钛矿材料,可以钝化PSK中的缺陷,建立更好的晶格匹配,从而提高PSK的质量和结晶度。开尔文探针力显微镜结果证实,AH促进了光生电子的定向迁移。飞秒瞬态吸收光谱结果验证了AH有效缩短了电子抽取寿命,促进了界面电子转移。基于AH改性的优点,AH基PSCs具有更高的PCE和更小的迟滞效应。Organic-inorganic halide perovskite solar cells(PSCs)have received widespread attention due to their outstanding photovoltaic performance and straightforward preparation process.However,charge recombination at the interface is a crucial factor limiting further enhancement of the power conversion efficiency(PCE)of the PSCs.In this study,we report the interfacial modification between the electron transport layer and the perovskite film(PSK)using ammonium hexachlorostannate(AH)crystals synthesized via the room temperature spin-coating method.AH as an inorganic tin-based perovskite material,can passivate defects in the PSK and establish a better lattice match,thereby enhancing the quality and crystallinity of the PSK.Kelvin probe force microscopy results confirm that AH promotes the directional migration of photogenerated electrons.Femtosecond transient absorption spectroscopy results verify that AH effectively shortens the lifetime of electron extraction and facilitates interfacial electron transfer.Based on the benefits of AH modification,AHbased PSCs exhibit higher PCE and reduced hysteresis effect.

关 键 词：界面修饰 晶格匹配 飞秒瞬态吸收光谱 电子转移动力学 电子动力学 

分 类 号：O649[理学—物理化学]