Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 47, Pages 32333-32340Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b11341
Keywords
perovskite solar cell; organometallic halide perovskite; degradation; transmission electron microscopy; electron energy loss spectroscopy
Funding
- Sustainable Energy and Education Research Center (SEERC)
- Tennessee Solar Conversion and Storage using Outreach, Research and Education (TN-SCORE)
- Department of Energy, Basic Energy Sciences (DOE-BES)
- Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
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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 similar to 50-60 degrees 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 CH3NH3+ organic moiety rather than the PbI6 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.
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