Dopant-free polymeric hole transport materials for highly efficient and stable perovskite solar cells

Abstract

A dopant–free polymeric hole transport material (HTM), <bold>RCP</bold>, based on benzo[1,2-<italic>b</italic>:4,5:<italic>b</italic>′]dithiophene and 2,1,3-benzothiadiazole exhibited a high efficiency of 17.3% in a perovskite solar cell and maintained its initial efficiency for over 1400 hours.