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Title
Solution-processed bulk-heterojunction organic solar cells employing Ir complexes as electron donors
Article in journal
Authors
Hongyu Zhen, Qiong Hou, Kan Li, Zaifei Ma, Simone Fabiano, Feng Gao, Fengling Zhang
Publication Year
2014
Source
Journal of Materials Chemistry A, 2014, (2)31, 12390-12396
Link to Source (DOI)
10.1039/c4ta01526f
Abstract
<p>To explore enhancing photocurrent in organic solar cells (OSCs) via harvesting triplet excitons, two novel bicycloiridium complexes (R-1 and R-2) are designed and synthesized. Conventional bulk-heterojunction triplet OSCs are solution processed using R-1 or R-2 as sole electron donors and phenyl-C-71-butyric acid methyl ester (PC71BM) as the electron acceptor. A decent short circuit current (J(sc)) of 6.5 mA cm(-2) is achieved though the overlap between the absorption spectrum (with similar to 550 nm absorption onset) of R-2 and the solar flux is relatively small. With an open circuit voltage of 0.74 V and a fill factor of 0.42, an encouraging power conversion efficiency of 2.0% is achieved in the OSCs based on R-2 and PC71BM without any processing additives and post-treatments. Our preliminary result demonstrates the possibility of utilizing Ir complexes as sole electron donors in OSCs, which extends available soluble small molecules for OSCs.</p>