Effect of backbone structures on photovoltaic properties in naphthodithiophene‐based copolymers |
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Authors: | Chinna Bathula Sachin Badgujar Chang Eun Song In‐Nam Kang Shinuk Cho Jong‐Cheol Lee Won Suk Shin Sang‐Jin Moon Sang Kyu Lee |
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Institution: | 1. Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), , Daejeon, 305‐600 Korea;2. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, , Daejeon, 305–701 Korea;3. Department of Chemistry, The Catholic University of Korea, , Bucheon, Gyeonggi‐do, Korea;4. Department of Physics and EHSRC, University of Ulsan, , Ulsan, Korea |
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Abstract: | A “zigzag” naphthodithiophene‐based copolymer, poly4,9‐bis(2‐ethylhexyloxy)naphtho1,2‐b:5,6‐b′]dithiophene‐2,7‐diyl‐alt‐1,3‐(5‐heptadecan‐9‐yl)‐4H‐thieno3,4‐c]pyrrole‐4,6‐dione] (P1) is synthesized and its properties are compared to “linear” naphthodithiophene‐based copolymer, poly4,9‐bis(2‐ethylhexyloxy)naphtho2,3‐b:6,7‐d′]dithiophene‐2,7‐diyl‐alt‐1,3‐(5‐heptadecan‐9‐yl)‐4H‐thieno3,4‐c]pyrrole‐4,6‐dione] (P2). The field‐effect carrier mobilities and the optical, electrochemical, and photovoltaic properties of the copolymers are systematically investigated. The results suggest that the backbone of the copolymer structure significantly influences the band gap, electronic energy levels, carrier mobilities, and photovoltaic properties of the resultant thin films. In this work, the zigzag naphtho1,2‐b:5,6‐b′]dithiophene‐based copolymer displays a good hole mobility and a high open‐circuit voltage; however, polymer solar cells in which the linear naphtho2,3‐b;6,7‐d′]dithiophene‐based copolymer is used as the electron donor material perform better than the cells prepared using the zigzag naphtho1,2‐b:5,6‐b′]dithiophene‐based copolymer. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52, 305–312 |
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Keywords: | conducting polymers naphthodithiophene‐based copolymers conjugated polymers thin films polymer solar cells |
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