期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 30, 页码 33751-33758出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c08322
关键词
perovskite solar cell; hole-transport material; p-type dopant; organic salt; stability; LiTFSI-free
资金
- Swedish Energy Agency
- Swedish Research Council [SNIC 2018/7-57, SNIC 2018/7-62]
- China Scholarship Council (CSC)
Despite the ubiquity and importance of organic hole-transport materials in photovoltaic devices, their intrinsic low conductivity remains a drawback. Thus, chemical doping is an indispensable solution to this drawback and is essentially always required. The most widely used p-type dopant, FK209, is a cobalt coordination complex. By reducing Co(III) to Co(II), Spiro-OMeTAD becomes partially oxidized, and the film conductivity is initially increased. In order to further increase the conductivity, the hygroscopic co-dopant LiTFSI is typically needed. However, lithium salts are normally quite hygroscopic, and thus, water absorption has been suggested as a significant reason for perovskite degradation and therefore limited device stability. In this work, we report a LiTFSI-free doping process by applying organic salts in relatively high amounts. The film conductivity and morphology have been studied at different doping amounts. The resulting solar cell devices show comparable power conversion efficiencies to those based on conventional LiTFSI-doped Spiro-OMeTAD but show considerably better long-term device stability in an ambient atmosphere.
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