Zn(II) and Cu(II) tetrakis(diarylamine)phthalocyanines as hole-transporting materials for perovskite solar cells

Finding new hole-transporting materials (HTMs) suitable for replacing the state-of-the-art spiro-OMe-TAD is still challenging. In this work, newly synthesized diarylamine-substituted metal phthalocyanines (MPcs, M 1/4 Zn(II) or Cu(II)) functionalized with either linear or branched alkoxy chains are evaluated as HTMs in perovskite solar cells. Both the nature of the alkoxy chains and that of the coordinated metal species were found to influence the functional properties of the new MPcs. In particular, devices based on a ZnPc featuring four n-butoxy side chains exhibited the highest power conversion efficiencies (PCEs). A PCE of 20.00% was reached for triple cation perovskite devices, and a PCE up to 20.18% could be achieved for double cation devices. (C) 2022 The Authors. Published by Elsevier Ltd.

Automated summary

Finding new hole-transporting materials to replace spiro-OMe-TAD remains challenging. In this study, newly synthesized metal phthalocyanines functionalized with alkoxyl chains were evaluated as HTMs in perovskite solar cells. The nature of the alkoxyl chains and coordinated metal species were found to affect the functional properties of the new materials. ZnPc with four n-butoxy side chains demonstrated the highest power conversion efficiency.