Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 49, Pages 17724-17730Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201907331
Keywords
all-inorganic perovskite solar cells; dopant-free; passivation; hole-transporting materials; polysquaraines
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Funding
- Natural Science Foundation of China [21704030, 21975085, 21761132001, 51803060, 51573057]
- Ministry of Science and Technology [2017YF0206600]
- Science and Technology Program of Guangdong Province, China [2018A030313045]
- Science and Technology Program of Guangzhou, China [201607020010, 2017A050503002]
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Development of high-performance dopant-free hole-transporting materials (HTMs) with comprehensive passivation effects is highly desirable for all-inorganic perovskite solar cells (PVSCs). Squaraines (SQs) could be a candidate for dopant-free HTMs as they are natural passivators for perovskites. One major limitation of SQs is their relatively low hole mobility. Herein we demonstrate that polymerizing SQs into pseudo two dimensional (2D) p-pi conjugated polymers could overcome this problem. By rationally using N,N-diarylanilinosquaraines as the comonomers, the resulting polysquaraine HTMs not only exhibit suitable energy levels and efficient passivation effects, but also achieve very high hole mobility close to 0.01 cm(-2) V-1 s(-1). Thus as dopant-free HTMs for alpha-CsPbI2Br-based all-inorganic PVSCs, the best PCE reached is 15.5 %, outperforming those of the doped-Spiro-OMeTAD (14.4 %) based control devices and among the best for all-inorganic PVSCs.
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