Title: Donor-Acceptor Random Copolymers Based on a Ladder-Type Nonacyclic Unit: Synthesis, Characterization, and Photovoltaic Applications
Authors: Chen, Chiu-Hsiang
Cheng, Yen-Ju
Chang, Chih-Yu
Hsu, Chain-Shu
Department of Applied Chemistry
Issue Date: 8-Nov-2011
Abstract: We have developed a ladder-type multifused thienyl-phenylene-thienylene-phenylene-thienyl (TPTPT) unit where each thiophene ring is covalently fastened with the adjacent benzene rings by a carbon bridge, forming four cyclopentadiene rings embedded in a nonacyclic structure. This rigid and coplanar TPTPT building block was copolymerized with electron-deficient acceptors, dibromobenzothiadiazole (BT) or dibromodithienyldiketopyrrolopyrrole (DPP), via Stille polymerization. By varying the feed ratio of the monomers, a new series of random copolymers PTPTPTBT11, PTPTPTBT12, PTPTPTDPP11, PTPTPTDPP12, and PTPTPTDPP13 with tunable optical and electronic properties were prepared. The PTPTPTDPP12/PC(71)BM (1:4, w/w) based device exhibited the highest short circuit current (J(sc)) of 10.78 mA/cm(2) with a good power conversion efficiency (PCE) of 4.3% due to the much boarder absorption ability and the highest hole mobility of PTPTPTDPP12. The devices based on PTPTPTDPP13, PTPTPTDPP11, PTPTPTBT12, and PTPTPTBT11 polymers also displayed promising efficiencies of 4.1%, 3.6%, 3.1%, and 2.8%, respectively. Most importantly, PTPTPTDPP12 has been demonstrated as a superior low-band-gap material for polymer solar cell with inverted architecture, achieving a high PCE of 5.1%.
URI: http://dx.doi.org/10.1021/ma201824g
ISSN: 0024-9297
DOI: 10.1021/ma201824g
Volume: 44
Issue: 21
Begin Page: 8415
End Page: 8424
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