| CPC H10K 85/111 (2023.02) [H10K 30/86 (2023.02); H10K 71/12 (2023.02); H10K 77/10 (2023.02); H10K 30/50 (2023.02); H10K 30/85 (2023.02)] | 18 Claims |

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1. A hole-transporting material for a perovskite solar cell comprising poly(bis(4-phenyl) (2,4,6-trimethylphenyl) amine) and at least one pyridine, wherein the at least one pyridine is covalently linked to the poly(bis(4-phenyl) (2,4,6-trimethylphenyl) amine).
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