화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.26, No.6, 500-505, June, 2018
DOI10.1007/s13233-018-6074-4  Export Citation
Impact of Topology of Alkoxy Side Chain in Alkoxyphenylthiophene Subsituted Benzodithiophene Based 2D Conjugated Low Bandgap Polymers on Photophysical and Photovoltaic Properties
Kakaraparthi Kranthiraja, Ho-Yeol Park, Kumarasamy Gunasekar, Won-Tae Park1, Yong-Young Noh1, Yeong-Soon Gal2, Jong Hun Moon3, †, Jin Yong Lee3, †, and Sung-Ho Jin†
  • Department of Chemistry Education, Graduate Department of Chemical Materials and Institute for Plastic Information and Energy Materials, Pusan National University, Busan 46241, Korea
  • 1Department of Energy and Materials Engineering, Dongguk University, 26 Pil-dong, 3 ga, Jung-gu, Seoul 04620, Korea
  • 2Department of Fire Safety, Kyungil University, Gyeongsan, 712-701, Korea
  • 3Department of Chemistry, Sungkyunkwan University, Suwon, Gyeonggi 16419, Korea
E-mail:, ,
We report a new series of low band gap (LBG) polymers (P1-P4), in which para or meta- alkoxyphenylthiophene (APTh) substituted benzodithiophene and 2,5-ethylhexyl-3,6-bis(5-bromothiophen-2-yl)pyrrolo[3,4-c]-pyrrole-1,4-dione or 2-ethylhexyl-4,6-dibromo-3-fluorothieno[3,4-b]thiophene-2-carboxylate are key repeating units. All the polymers showed broad absorption profiles over 900 nm with reduced optical band gaps (E g opt ). Interestingly, the straightforward modification (exchanging the topology of alkoxy side chain on phenyl group of APTh in donor unit) brought considerable changes in photophysical and photovoltaic properties of new polymers. In particular, meta-substituted polymers (P2, P4) showed reduced E g opt (1.26, 1.41 eV), deep highest occupied molecular orbitals (HOMOs) (-5.23, -5.28 eV) than para-substituted polymers P1, P3 (E g opt =1.33, 1.44 eV; HOMOs=-5.19, -5.20 eV). Furthermore, the optimized P2 and P4 based devices delivered an enhanced power conversion efficiency (PCE) of 4.39 and 4.33%, with open-circuit voltage (V oc ) of 0.71 and 0.79 V, respectively, which are higher than P1 (PCE of 2.95 with V oc of 0.65) and P3 (PCE of 2.33% with V oc of 0.69 V) based devices.
Keywords:low band gap polymers;polymer solar cells;polymer filed effect transistors;topology
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