期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 5, 页码 5289-5297出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19036
关键词
electron transport materials; hydrophobic polymer; fluoro and amino side chains; perovskite solar cells; conjugated polymers
资金
- National Natural Science Foundation of China [21634004, 21490573, 91633301, 51803060, 21 761132001]
- Science and Technology Program of Guangzhou, China [20 1607020010]
- Foundation of Guangzhou Science and Technology Project [20170702 0019]
- Peacock Team Project funding from the Shenzhen Science and Technology Innovation Committee [KQTD2015033110182370]
We report here novel bifunctionalized electron transport materials (ETMs) that can improve the efficiency and stability of perovskite solar cells (PVSCs) simultaneously. By functionalizing n-type conjugated polymers with fluoro and amino side chains, PN, PN-F25%, and PN-F50% with varied contents of fluoro and amino side chains are prepared. It is found that the amino side chains in ETMs efficiently improve the interface contact and electron collection of PVSCs, with improved power conversion efficiency from 14.0% for PC61BM-based devices to more than 17% for PN- and PN-F25%-based devices. Moreover, the fluoro side chains endow these polymers with excellent hydrophobic properties, which largely enhance their water-resistance capabilities. ETMs with the increased content of fluoro side chains can substantially improve the water resistance of perovskite layers, with a significant improvement in the stability of PVSCs. Our results indicate that the fluoro-and amino-bifunctionalized strategy is a promising method to design ETMs for high-performance and stable PVSCs.
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