Journal
ADVANCED SUSTAINABLE SYSTEMS
Volume 5, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsu.202100244
Keywords
charge transfer dynamics; hole-transport material; interfacial modification; Pb-S bond; perovskite solar cells; stability
Funding
- Natural Science Foundation of China [21805151]
- Natural Science Foundation of Shandong Province, China [ZR2018MB024]
- Young Taishan Scholars [201909120]
- Finnish Cultural Foundation [00210670]
- Jane and Aatos Erkko foundation (project ASPIRE)
- Australian government through the Australian Research Council (ARC) under the Centre of Excellence scheme [CE170100026]
- NCI National Facility for computing resources
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The study introduces a novel sulfonated phenothiazine-based hole-transport material TAS, which enhances the open-circuit voltage and performance of perovskite solar cells through Pb-S bond functionalization, as well as improving stability.
The integration of a functional group into dopant-free hole-transport materials (HTMs) to modify the perovskite|HTM interface has become a promising strategy for high-performance and stable perovskite solar cells (PSCs). In this work, a sulfonated phenothiazine-based HTM is reported, namely TAS, which consists of a butterfly structure with a readily synthesized N, N- bis[4- (methylthio) phenyl] aniline side functional group. The interaction between TAS and perovskite via Pb-S bond induces a dipole moment that deepens the valence band of perovskite and thereby leads to enhanced open-circuit voltage in corresponding n-i-p PSCs. More importantly, the functionalization of perovskite surface via Pb-S bond promotes the hole extraction reaction while suppressing the interfacial non-radiative recombination, contributing to a 20-50% performance improvement compared to less- (4- (methylthio) - N- [4- (methylthio) phenyl] aniline, DAS) or non-interacting (N,N-bis(4-methoxyphenyl)aniline, TAO) counterparts. Consequently, TAS-based PSCs exhibit superior device stability with a high PCE retention (>90% of the initial value) after 125 days of storage in the air.
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