Accelerated Degradation Due to Weakened Adhesion from Li-TFSI Additives in Perovskite Solar Cells

Title
Accelerated Degradation Due to Weakened Adhesion from Li-TFSI Additives in Perovskite Solar Cells
Authors
손해정이인화윤재훈김택수
Keywords
solar cell; stability; perovskite solar cell; moisture; adhesion; additive; decomposition mechanism
Issue Date
2017-03
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 9, NO 8-7035
Abstract
Reliable integration of organometallic halide perovskite in photovoltaic devices is critically limited by its low stability in humid environments. Furthermore, additives to increase the mobility in the hole transport material (HTM) have deliquescence and hygroscopic properties, which attract water molecules and result in accelerated degradation of the perovskite devices. In this study, a double cantilever beam (DCB) test is used to investigate the effects of additives in the HTM layer on the perovskite layer through neatly delaminating the interface between the perovskite and HTM layers. Using the DCB test, the bottom surface of the HTM layers is directly observed, and it is found that the additives are accumulated at the bottom along the thickness (i.e., through-plane direction) of the films. It is also found that the additives significantly decrease the adhesion at the interface between the perovskite and HTM layers by more than 60% through hardening the HTM films. Finally, the adhesion-based degradation mechanism of perovskite devices according to the existence of additives is proposed for humid environments.
URI
http://pubs.kist.re.kr/handle/201004/66276
ISSN
1944-8244
Appears in Collections:
KIST Publication > Article
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