Observation of Nanoscale Morphological and Structural Degradation in Perovskite Solar Cells by in Situ TEM

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• 作者：Bin Yang ; Ondrej Dyck ; Wenmei Ming ; Mao-Hua Du ; Sanjib Das ; Christopher M. Rouleau ; Gerd Duscher ; David B. Geohegan ; Kai Xiao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：November 30, 2016
• 年：2016
• 卷：8
• 期：47
• 页码：32333-32340
• 全文大小：517K
• ISSN：1944-8252

文摘

High-resolution in situ transmission electron microscopy (TEM) and electron energy loss spectroscopy were applied to systematically investigate morphological and structural degradation behaviors in perovskite films during different environmental exposure treatments. In situ TEM experiment indicates that vacuum itself is not likely to cause degradation in perovskites. In addition, these materials were found to degrade significantly when they were heated to ∼50–60 °C (i.e., a solar cell’s field operating temperature) under illumination. This observation thus conveys a critically important message that the instability of perovskite solar cells at such a low temperature may limit their real field commercial applications. It was further unveiled that oxygen most likely attacks the CHb>3b>NHb>3b>⁺ organic moiety rather than the PbIb>6b> component of perovskites during ambient air exposure at room temperature. This finding grants a deeper understanding of the perovskite degradation mechanism and suggests a way to prevent degradation of perovskites by tailoring the organic moiety component.