Key points are not available for this paper at this time.
A dopant–free polymeric hole transport material (HTM), RCP, based on benzo1,2-b:4,5:b′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.
Kim et al. (2016) studied this question.