Organic Salts as p-Type Dopants for Efficient LiTFSI-Free Perovskite Solar Cells.

ABSTRACT: 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 b

SUBMITTER: Zhang W 

PROVIDER: S-EPMC7467566 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature