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无机双钙钛矿太阳能电池材料Cs2AgBiBr6在电子束辐照下的降解行为研究

冯远皓，柯小行*，隋曼龄*
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2020年 第39卷 第1期: 1000-6281（2020）01-001-08     下载地址：

无机双钙钛矿太阳能电池材料Cs2AgBiBr6在电子束辐照下的降解行为研究

冯远皓，柯小行*，隋曼龄*

（北京工业大学固体微结构与性能研究所，北京 100124)

摘要  Cs2AgBiBr6是一种新型的无机无铅双钙钛矿材料，具备环境友好、高稳定性等特点，并在光伏、光电等领域具有良好的应用前景。透射电子显微镜作为一种常用的材料表征手段，能够直观地分析材料的微观结构及其演变规律。然而Cs2AgBiBr6在利用透射电子显微镜进行表征时，极易受到电子束辐照破坏，且其降解机制尚不明确。本文研究了单晶Cs2AgBiBr6在透射电子显微镜下受电子束辐照后的影响，通过高分辨像和选取电子衍射分析其结构演变。分析结果表明：单晶Cs2AgBiBr6表面因辐照分解效应导致原子丢失的同时，最先发生微小的晶格调整，生成初始的降解产物之一为Cs3Bi2Br9相；在持续的电子束辐照下，单晶Cs2AgBiBr6的降解产物为Cs3Bi2Br9，BiBr3，CsAgBr2和AgBr，并提出了电子束辐照下可能发生了两种分解反应方式复合降解机制。本文为在透射电子显微镜下研究Cs2AgBiBr6材料提供了电子束辐照的相对安全剂量，对于深入研究以Cs2AgBiBr6为代表的无机无铅卤素双钙钛矿材料的结构特性具有指导意义。

关键词  无机钙钛矿太阳能电池材料；Cs2AgBiBr6；透射电镜；辐照损伤

中图分类号：TB34；TG914.4；TG115.21+5.3 文献标识码：A   doi:10.3969/j.issn.1000-6281.2020.01.001

 

Effect of electron irradiation on inorganic double perovskite solar cell material Cs2AgBiBr6

FENG Yuan-hao，KE Xiao-xing*，SUI Man-ling*

(Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China)

Abstract Cs2AgBiBr6as a novel lead-free inorganic double perovskite material featured by environment-friendly and high stability, which is one of the most promising candidates in the research for photovoltaic and photoelectric applications. Transmission electron microscopy (TEM) is one of the most straightforward characterization methods in the study of materials microstructures and their evolution. However, Cs2AgBiBr6 is extremely beam-sensitive and rapidly damaged by electron beam irradiation when characterized by electron microscopy. Therefore, TEM study of Cs2AgBiBr6is rarely reported and its degradation mechanism remains unclear. In this paper, the effect of electron beam irradiation on single crystal Cs2AgBiBr6was studied by TEM. The degradation of Cs2AgBiBr6 and its structural evolution were analyzed by high resolution TEM (HRTEM) and electron diffraction. The results showed that the atoms desorption at Cs2AgBiBr6 surface caused by radiolysis was first accommodated by slight lattice adjustment, resulting in an initial decomposition product of Cs3Bi2Br9. Further irradiation by electron beam led to the continuous degradation, the degradation products wereidentifiedof Cs3Bi2Br9, BiBr3, CsAgBr2 and AgBrphases. This study proposed that the decomposition path of Cs2AgBiBr6 under electron beam irradiation may combine twodegradation pathways predicted by the theory. Meanwhile, our study provided a relatively “safe” dose rate of imaging Cs2AgBiBr6, and may help the community in studying halide double perovskite materials by using TEM.

Keywords inorganic double perovskite solar cell material；Cs2AgBiBr6；transmissionelectron microscopy；irradiation damage

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