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A Soluble High Molecular Weight Copolymer of Benzo[1,2-b:4,5-b′]dithiophene and Benzoxadiazole for Efficient Organic Photovoltaics

✍ Scribed by Wanyi Nie; Christopher M. MacNeill; Yuan Li; Ronald E. Noftle; David L. Carroll; Robert. C. Coffin

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 380 KB
Volume: 32
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.201100161

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✦ Synopsis

Abstract

The synthesis and characterization of a soluble high molecular weight copolymer based on 4,8‐bis(1‐pentylhexyloxy)benzo[1,2‐b:4,5‐b′]dithiophene and 2,1,3‐benzoxadiazole is presented. High efficiency organic photovoltaic (OPV) devices comprised of this polymer and phenyl‐C~71~‐butyric acid methyl ester (PC~71~BM) were fabricated by additive processing with 1‐chloronapthalene (CN). When the active layer is cast from pristine chlorobenzene (CB), power conversion efficiencies (PCEs) average 1.41%. Our best condition—using 2% chloronapthalene as a solvent additive in CB—results in an average PCE of 5.65%, with a champion efficiency of 6.05%. magnified image

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Synthesis and Photovoltaic Properties of Conjugated Copolymers with Benzo[1,2-b:4,5-b′]dithiophene and Bis(thiophene)phthalimide Units

✍ Guobing Zhang; Yingying Fu; Qing Zhang; Zhiyuan Xie 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 297 KB

## Abstract Two new donor/acceptor copolymers PBDTPhBT1 and PBDTPhBT2 with alternating benzodithiophene (BDT) and bisthiophene‐phthalimide (PhBT) units were synthesized by Stille coupling reaction. The copolymers showed identical optical bandgaps of 1.98 eV. The HOMO energy levels are −5.35 and −5.