物理化学学报 >> 2024, Vol. 40 >> Issue (11): 2402006.doi: 10.3866/PKU.WHXB202402006

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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

刘纪舟1, 艾陈斌2, 胡晨睿2, 程蓓1, 张建军2,*()   

  1. 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
  • 收稿日期:2024-02-05 修回日期:2024-02-28 录用日期:2024-02-28 发布日期:2024-03-04
  • 通讯作者: Email: zhangjianjun@cug.edu.cn (张建军)
  • 基金资助:
    国家自然科学基金(52073223); 国家自然科学基金(22278324); 国家自然科学基金(52202375); 湖北省自然科学基金(2022CFA001)

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

Jizhou Liu1, Chenbin Ai2, Chenrui Hu2, Bei Cheng1, Jianjun Zhang2,*()   

  1. 1 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
    2 Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China
  • Received:2024-02-05 Revised:2024-02-28 Accepted:2024-02-28 Published:2024-03-04
  • Contact: Email: zhangjianjun@cug.edu.cn (Jianjun Zhang)
  • Supported by:
    the National Natural Science Foundation of China(52073223); the National Natural Science Foundation of China(22278324); the National Natural Science Foundation of China(52202375); Natural Science Foundation of Hubei Province of China(2022CFA001)

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说明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修饰的PSCs具有更高的PCE和更小的迟滞效应。

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

Abstract:

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, AH-based PSCs exhibit higher PCE and reduced hysteresis effect.

Key words: Interface modification, Lattice matching, Femtosecond transient absorption spectra, Electron transfer kinetics, Electron dynamics