화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.28, No.10, 903-909, September, 2020
DOI10.1007/s13233-020-8124-y  Export Citation
Synthesis and Characterization of Benzotriazole-Based Polymer Donors with Good Planarity for Organic Photovoltaics
Suha Lee, Jong-Woon Ha, Hea Jung Park, and Do-Hoon Hwang†
  • Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Korea
E-mail:
Two benzotriazole-based polymer donors, poly[4-(5-(2,5-bis((2-hexyldecyl]oxy]-4-(thiophene-2-yl]-phenyl]thiophene-2-yl]-5,6-difluoro-2-octyl-2H-benzo [d][1,2,3]triazole] (PPBTA-2HD) and poly[4-(5-(2,5-bis((2-hexyltridecyl]oxy]-4-(thiophene-2-yl]-phenyl]thiophene-2-yl]-5,6-difluoro-2-octyl-2H-benzo[d][1,2,3] triazole] (PPBTA-5HD), were synthesized, and their physical, optical, and electrochemical properties were characterized. The backbones of two polymers contain fluorine in the benzotriazole and alkoxy substituents in the phenylene units, resulting in molecular planarity by exploiting S…O and S…F noncovalent interactions. PPBTA-2HD and PPBTA-5HD were used as electron donors and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM] as an electron acceptor in the active layer of the bulk-hetero-junction solar cells. PPBTA-5HD exhibited better device performance than PPBTA-2HD, with a power conversion efficiency of 2.82% and a short-circuit current of 6.52 mA/cm2. Analysis of the microstructural film morphologies of two polymers by 2D-grazing incident X-ray diffraction revealed that PPBTA-5HD had higher crystallinity than PPBTA-2HD, leading to better device performance.
Keywords:D-A copolymer;benzotriazole;linear alkyl spacer;organic photovoltaics
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