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钙钛矿/银电极界面降解和离子迁移的原位研究
李 雄1, 丁红鹤1, 李贵航1, 王 岩1, 方志敏2, 杨上峰2, 鞠焕鑫1, 朱俊发*1
1.中国科学技术大学国家同步辐射实验室,合肥 230029;2.中国科学技术大学材料科学与工程系,合肥微尺度物质科学国家研究中心,中国科学院能量转换材料重点实验室,量子信息与量子物理协同创新中心,合肥 230026
摘要:
本文对CH3NH3PbI3钙钛矿层与Ag电极之间的界面降解和离子迁移过程进行了全面地研究. 利用原位光电子能谱检测手段,发现了Ag电极会诱导钙钛矿层的降解,导致PbI2和AgI物种的形成以及Pb2+离子在界面处还原成金属Pb物种. I 3d谱峰强度的反常增强为碘离子从CH3NH3PbI3下表面迁移到Ag电极提供了直接的实验证据. 此外,Ag电极和钙钛矿层接触会在CH3NH3PbI3/Ag界面处诱导0.3 eV的界面偶极,这可能进一步促进碘离子扩散迁移,导致钙钛矿层的分解和Ag电极的侵蚀.
关键词:  钙钛矿太阳能电池,界面降解,离子迁移,光电子能谱
DOI:10.1063/1674-0068/cjcp1808189
分类号:
基金项目:
In situ Investigations of Interfacial Degradation and Ion Migration at CH3NH3PbI3 Perovskite/Ag Interfaces
Xiong Li1, Hong-he Ding1, Gui-hang Li1, Yan Wang1, Zhi-min Fang2, Shang-feng Yang2, Huan-xin Ju1, Jun-fa Zhu*1
1.National Synchrotron Radiation Laboratory and Department of Chemical Physics, University of Science and Technology of China, Hefei 230029, China;2.Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Department of Materials Science and Engineering, Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:
Interfacial properties between perovskite layers and metal electrodes play a crucial role in the device performance and the long-term stability of perovskite solar cells. Here, we report a comprehensive study of the interfacial degradation and ion migration at the interface between CH3NH3PbI3 perovskite layer and Ag electrode. Using in situ photoemission spectroscopy measurements, we found that the Ag electrode could induce the degradation of perovskite layers, leading to the formation of PbI2 and AgI species and the reduction of Pb2+ ions to metallic Pb species at the interface. The unconventional enhancement of the intensities of I 3d spectra provides direct experimental evidences for the migration of iodide ions from CH3NH3PbI3 subsurface to Ag electrode. Moreover, the contact of Ag electrode and perovskite layers induces an interfacial dipole of 0.3 eV at CH3NH3PbI3/Ag interfaces, which may further facilitate iodide ion di usion, resulting in the decomposition of perovskite layers and the corrosion of Ag electrode.
Key words:  Perovskite solar cells, Interfacial degradation, Ions migration, Photoemission spectroscopy
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