Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Characterization of Thiophene-Based Copolymers Containing Urethane and Alkyl Functional Side Chains for Hybrid Bulk Heterojunction Photovoltaic Cell Applications

  • Im, Min-Joung (Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University) ;
  • Kim, Chul-Hyun (Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University) ;
  • Song, Myung-Kwan (Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University) ;
  • Park, Jin-Su (Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University) ;
  • Lee, Jae-Wook (Department of Chemistry, Dong-A University) ;
  • Gal, Yeong-Soon (Polymer Chemistry Lab., Kyungil University) ;
  • Lee, Jun-Hee (Department of Advanced Materials Engineering, Dong-A University) ;
  • Jin, Sung-Ho (Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University)
  • Received : 2010.06.22
  • Accepted : 2010.12.06
  • Published : 2011.02.20
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Abstract

The following noble series of statistical copolymers, poly[(2-(3-thienyl)ethanol n-butoxycarbonylmethylurethane)-co-3-hexylthiophene] (PURET-co-P3HT), were synthesized by the chemical dehydrogenation method using anhydrous $FeCl_3$. The structure and electro-optical properties of these copolymers were characterized using $^1H$-NMR, UV-visible spectroscopy, elemental analysis, GPC, DSC, TGA, photoluminescence (PL), and cyclic voltammetry (CV). The statistical copolymers, PURET-co-P3HT (1:0, 2:1, 1:1, 1:2, 1:3), were soluble in common organic solvents and easily spin coated onto indium-tin oxide (ITO) coated glass substrates. Hybrid bulk heterojunction photovoltaic cells with an ITO/G-PEDOT/PURET-co-P3HT:PCBM:Ag nanowires/$TiO_x$/Al configuration were fabricated, and the photovoltaic cells using PURET-co-P3HT (1:2) showed the best photovoltaic performance compared with those using PURET-co-P3HT (1:0, 2:1, 1:1, 1:3). The optimal hybrid bulk heterojunction photovoltaic cell exhibits a power conversion efficiency (PCE) of 1.58% ($V_{oc}$ = 0.82 V, $J_{sc}$ = 5.58, FF = 0.35) with PURET-co-P3HT (1:2) measured by using an AM 1.5 G irradiation (100 mW/$cm^2$) on an Oriel Xenon solar simulator (Oriel 300 W).

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