Synthesis and photovoltaic properties of a low‐band‐gap polymer consisting of alternating thiophene and benzothiadiazole derivatives for bulk‐heterojunction and dye‐sensitized solar cells |
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| Authors: | Won Suk Shin Sung Chul Kim Seung‐Joon Lee Han‐Su Jeon Mi‐Kyoung Kim B Vijaya Kumar Naidu Sung‐Ho Jin Jin‐Kook Lee Jae Wook Lee Yeong‐Soon Gal |
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| Institution: | 1. Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University, Busan 609‐735, Korea;2. Sung‐Ho Jin, Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University, Busan 609‐735, Korea;3. Jae Wook Lee, Department of Chemistry, Dong‐A University, Busan 604‐714, Korea;4. Department of Polymer Science and Engineering, Pusan National University, Busan 609‐735, Korea;5. Department of Chemistry, Dong‐A University, Busan 604‐714, Korea;6. Polymer Chemistry Lab, Kyungil University, Hayang 712‐701, Korea |
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| Abstract: | We synthesized a novel low‐band‐gap, conjugated polymer, poly4,7‐bis(3′,3′‐diheptyl‐3,4‐propylenedioxythienyl)‐2,1,3‐benzothiadiazole] poly(heptyl4‐PTBT)], consisting of alternating electron‐rich, diheptyl‐substituted propylene dioxythiophene and electron‐deficient 2,1,3‐benzothiadiazole units, and its photovoltaic properties were investigated. A thin film of poly(heptyl4‐PTBT) exhibited an optical band gap of 1.55 eV. A bulk‐heterojunction solar cell with indium tin oxide/poly(3,4‐ethylenedioxythiophene)/poly(heptyl4‐PTBT): methanofullerene 6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) (1:4)/LiF/Al was fabricated with poly(heptyl4‐PTBT) as an electron donor and PCBM as an electron acceptor and showed an open‐circuit voltage, short‐circuit current density, and power conversion efficiency of 0.37 V, 3.15 mA/cm2, and 0.35% under air mass 1.5 (AM1.5G) illumination (100 mW/cm2), respectively. A solid‐state, dye‐sensitized solar cell with a SnO2:F/TiO2/N3 dye/poly(heptyl4‐PTBT)/Pt device was fabricated with poly(heptyl4‐PTBT) as a hole‐transport material. This device exhibited a high power conversion efficiency of 3.1%, which is the highest power conversion efficiency value with hole‐transport materials in dye‐sensitized solar cells to date. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 1394–1402, 2007 |
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| Keywords: | blends charge transport conducting polymers conjugated polymers electrochemistry fullerenes |
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