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Synthesis and Photovoltaic Properties of Conjugated Polymers Having Push-pull Structure according to the Type of Side-chain in the N-Substituted Phenothiazine

Push-pull 구조의 공액 고분자 합성 및 Phenothiazine의 질소 원자에 치환된 Side-chain에 따른 유기박막태양전지로의 특성 연구

  • Seong, Ki-Ho (Department of Industrial Chemistry, Sangmyung University) ;
  • Yun, Dae-Hee (Department of Industrial Chemistry, Sangmyung University) ;
  • Woo, Je-Wan (Department of Industrial Chemistry, Sangmyung University)
  • Received : 2014.09.22
  • Accepted : 2014.10.22
  • Published : 2014.12.10

Abstract

In this study, a new series of conjugated polymer 3-(5-(5,6-bis(octyloxy)-7-(thiophen-2-yl)benzo[c][1,2,5]thiadiazol-4-yl)thiophen-2-yl)-10-(4-(octyloxy)phenyl)-10H-phenothiazine (P1) and 3-(5-(5,6-bis(octyloxy)-7-(thiophen-2-yl)benzo[c][1,2,5]thiadiazol-4-yl)thiophen-2-yl)-10-(4-((2-ethylhexyl)oxy)phenyl)-10H-phenothiazine (P2) were synthesised and organic photovoltaics (OPVs) properties were characterized. The push-pull structure polymer consisted of phenothiazine derivative as an electron donor and benzothiadiazole derivative as an electron acceptor. The aliphatic chain substituted aromatic ring was substituted at the position of N in phenothiazine for the electron-rich and improved solubility. Excellent thermal stabilities of P1 and P2 were confirmed by measured Td values as 321.9 and $323.7^{\circ}C$, respectively and the degrees of polymerization were 4,911 (P1) and 5,294 (P2). The maximum absorption wavelength of P1 and P2 were 549 and 566 nm, respectively. The device was fabricated and the OPVs property was measured. As a result, the power efficiency of conversion for P1 and P2 were 0.96 and 0.90%, respectively.

Keywords

Phenothiazine;Benzothiadiazole;Push-pull structure;Side-chain effect;Conjugated polymer

Acknowledgement

Supported by : 상명대학교

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