A cyclometalating organic ligand with an Iridium center toward dramatically improved photovoltaic performance in organic solar cells

Qingjing Wu; Yang Cheng; Zhongyuan Xue; Xuyu Gao; Menghan Wang; Wenbo Yuan; Sven Huettner; Shigang Wan; Xudong Cao; Youtian Tao; Wei Huang

doi:10.1039/C9CC00173E

A cyclometalating organic ligand with an Iridium center toward dramatically improved photovoltaic performance in organic solar cells†

Qingjing Wu,‡^a Yang Cheng,‡^a Zhongyuan Xue,‡^a Xuyu Gao,^a Menghan Wang,^a Wenbo Yuan,^a Sven Huettner,^b Shigang Wan,^a Xudong Cao,^ab Youtian Tao

*^a and Wei Huang^ac

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* Corresponding authors

^a Key Lab for Flexible Electronics and Institute of Advanced Materials, Nanjing Tech University, 30 South Puzhu Road, Nanjing, P. R. China
E-mail: iamyttao@njtech.edu.cn

^b Macromolecular Chemistry I, Universität Bayreuth, 30 Universitätsstr, Bayreuth 95447, Germany

^c Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi’an 710072, People's Republic of China

Abstract

Organometallic compounds as photoactive materials are relatively new in organic solar cells. Upon cyclometalation, the octahedral heteroleptic Ir complex TBzIr exhibits significantly enhanced optical-absorption and improved film-morphology compared to the planar organic 2-(5′′-hexyl-[2,2′:5′,2′′-terthiophen]-5-yl)benzo[d]thiazole (TBz) ligand. Thus, a dramatically improved power conversion efficiency (PCE) from ∼0 to 3.81% is attained when combined with PC₇₁BM.

Chemical Communications

A cyclometalating organic ligand with an Iridium center toward dramatically improved photovoltaic performance in organic solar cells†

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A cyclometalating organic ligand with an Iridium center toward dramatically improved photovoltaic performance in organic solar cells

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