The effect of defects in tin-based perovskites and their photovoltaic devices
The effect of defects in tin-based perovskites and their photovoltaic devices
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DOI：
10.1016/j.mtphys.2021.100513
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发表时间：
2021-09-10
影响因子：
11.5
通讯作者：
Wang, M.
中科院分区：
文献类型：
--
作者：
Cao, H.;Zhang, Z.;Wang, M.
锡基钙钛矿太阳能电池具有禁带宽度小、载流子迁移率高、无毒等优点，具有很大的发展潜力。随着对这些无铅钙钛矿的兴趣不断增加，Sn（II）氧化成Sn（IV）已被揭示为对其光伏性能最关键的问题之一。在此，Sn（II）氧化和相关的缺陷的来源和影响已审查沿着与抑制方法。与铅基钙钛矿中的这些缺陷相比，Sn空位由于其低形成能而在锡基钙钛矿晶格中占主导地位。基本上容易的Sn（II）氧化可归因于Sn（II）/Sn（IV）电对的固有低标准氧化还原电位（0.15V vs. SHE）。因此，锡氧化及其相应的缺陷行为严重影响器件的光伏性能，包括输出光电压和功率转换效率。本文综述了抑制锡氧化的方法，如卤化锡补偿、还原剂、成分和形貌优化以及封装等。并对进一步抑制锡氧化过程以提高锡基钙钛矿太阳能电池性能提出了展望。(C)2021爱思唯尔有限公司版权所有。
Tin-based perovskite solar cells have exhibited great potential for their small bandgap, high carrier mobility, and non-toxic property. With an ever-increasing interest in putting on these lead-free perovskites, the oxidation of Sn(II) to Sn(IV) has been revealed as one of the most crucial issues on their photovoltaic performance. Herein, the sources and impact of Sn(II) oxidation and the correlated defects have been reviewed along with the suppression approaches. Compared to these defects in lead-based perovskites, the Sn vacancy dominants tin-based perovskite lattice due to their low formation energy. The essentially easy Sn(II) oxidation can be attributed to the intrinsically low standard redox potential of Sn(II)/Sn(IV) couple (0.15 V vs. SHE). Consequently, tin oxidation and its corresponding defective behavior seriously affect the device photovoltaic performance including output photovoltage and power conversion efficiency. We summarize these methods to suppress tin oxidation, such as tin halide compensation, reducing agents, composition and morphology optimization, and encapsulation. We further propose the prospective possible explorations for further restraining the tin oxidation process to improve the performances of tin-based perovskite solar cells. (C) 2021 Elsevier Ltd. All rights reserved.