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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.
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