Benzooxadiazole-based donor/acceptor copolymers imparting bulk-heterojunction solar cells with high open-circuit voltages

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• 作者：Jian-Ming Jiang ; Po-An Yang ; Shang-Che Lan ; Chia-Ming Yu ; Kung-Hwa Wei ; ^{khwei@mail.nctu.edu.tw}
• 关键词：Polymer solar cell ; Suzuki coupling ; Donor/acceptor conjugated polymers
• 刊名：Polymer
• 出版年：2013
• 出版时间：8 January, 2013
• 年：2013
• 卷：54
• 期：1
• 页码：155-161
• 全文大小：1103 K

文摘

In this study we used Suzuki cross-coupling to synthesize three new donor/acceptor copolymers¡ªPFTBO, PAFTBO, and PCTBO¡ªfeaturing soluble alkoxy-modified 2,1,3-benzooxadiazole (BO) moieties as acceptor units and electron-rich building blocks¡ªdialkyl fluorene (F), alkylidene fluorene (AF), and carbazole (C), respectively¡ªas donor units. These polymers, which we characterized using gel permeation chromatography, thermogravimetric analysis, NMR spectroscopy, UV-Vis absorption spectroscopy, and electrochemical cyclic voltammetry, exhibited good solubility, low-lying energy levels for their highest occupied molecular orbitals, excellent thermal stability, and air stability. Using these polymers, we fabricated bulk-heterojunction solar cell devices having the structure indium tin oxide/poly(3,4-ethylenedioxythiophene):polystyrenesulfonate/polymer:[6,6]-phenyl-C₆₁-butyric acid methyl ester (PC₆₁BM) (1:1, w/w)/Ca/Al. Under AM 1.5G illumination (100?mW?cm^?2), the solar cell incorporating PFTBO exhibited a high value of V_oc of 1.04?V and that based on PCTBO provided a power conversion efficiency of 4.1 % without the need for any post treatment.