Two novel donor–acceptor–donor (D–A–D) type dopant-free hole transport materials (HTMs), named BDD-T and BTT-T, were developed and applied in perovskite solar cells. An impressive power conversion efficiency (PCE) of 20.9% was acquired, which is one of the highest PCEs for D–A–D type dopant-free HTMs.
X. Yin, J. Song, L. Hu, Y. Jin, L. Lu, Z. Su and Z. Li, Chem. Commun., 2022, 58, 7940 DOI: 10.1039/D2CC02346F
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