An Interlocking Fibrillar Polymer Layer for Mechanical Stability of Perovskite Solar Cells

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Atmospheric and mechanical stability of perovskite solar cells (PSCs) must be guaranteed for successful commercialization. A fibrillar polymer, poly[N-9 '-heptadecanyl-2,7-carbazole-alt-5,5-(4 ',7 '-di-2-thienyl-2 ',1 ',3 '-benzothiadiazole)] (PCDTBT), is reported as an efficient hole transfer layer (HTL) which significantly improves air and mechanical stability of perovskite solar cells (PSCs). PCDTBT fibrils formed at the grain boundaries of perovskite layer induce the highest fracture energies in the PSCs, which provide extrinsic reinforcement and shielding for enhanced mechanical and chemical stability. Debonding energy increases by 30% for the PSCs with PCDTBT fibrils, which fractures at 2.66 J m(-2), compared to the devices without PCDTBT fibrils at 2.09 J m(-2); more importantly, the threshold debonding driving force of the PCDTBT fibril-based devices is greatly improved by twofold under ambient conditions.
Publisher
WILEY
Issue Date
2020-12
Language
English
Article Type
Article
Citation

ADVANCED MATERIALS INTERFACES, v.7, no.23

ISSN
2196-7350
DOI
10.1002/admi.202001425
URI
http://hdl.handle.net/10203/279449
Appears in Collection
ME-Journal Papers(저널논문)EE-Journal Papers(저널논문)
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