Triplet Homoleptic Iridium(III) Complex as a Potential Donor Material for Organic Solar Cells

Tianjian Yang, Bingzhe Wang, Yinming He, Aihua Zhou, Zhichao Yao, Guichuan Xing, Youtian Tao

科研成果: 期刊稿件文章同行评审

10 引用 (Scopus)

摘要

Triplet photovoltaic materials have been rarely investigated in organic solar cells (OSCs) because the role and mechanism of triplet excitons are still unclear. Cyclometalated heavy metal complexes with triplet features are expected to increase exciton diffusion lengths and improve exciton dissociation in OSCs, while the power conversion efficiencies (PCEs) of their bulk-heterojunction (BHJ) OSCs are still limited to <4%. We herein report an octahedral homoleptic tris-Ir(III) complex TBz3Ir as a donor material for BHJ OSCs with a PCE of over 11%. In comparison with the planar organic TBz ligand and heteroleptic TBzIr, TBz3Ir demonstrates the highest PCE and best device stability in both fullerene- and non-fullerene-based devices, owing to the long triplet lifetime, enhanced optical absorption, increased charge transport, and improved film morphology. From transient absorption, triplet excitons were deduced to participate in the photoelectric conversion process. In particular, the more significant 3D structure of TBz3Ir induces an unusual film morphology in TBz3Ir:Y6 blends, showing obviously large domain sizes suitable for triplet excitons. Thus, a high PCE of 11.35% with a high circuit current density of 24.17 mA cm-2 and a fill factor of 0.63 is achieved for small-molecular Ir complex-based BHJ OSCs.

源语言英语
页(从-至)5920-5930
页数11
期刊Inorganic Chemistry
62
15
DOI
出版状态已出版 - 17 4月 2023

指纹

探究 'Triplet Homoleptic Iridium(III) Complex as a Potential Donor Material for Organic Solar Cells' 的科研主题。它们共同构成独一无二的指纹。

引用此