New conjugated copolymers based on benzo[1,2-b; 3,4-b′]dithiophene and derivatives of benzo[g]quinoxaline for bulk heterojunction solar cells

Po I. Lee, Steve Lien-Chung Hsu, Jung Feng Lee, Hung Yi Chuang, Piyun Lin

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A series of new low-band gap copolymers based on dioctyloxybenzo[1,2-b;3,4- b′] dithiophene and bis(2-thienyl)-2,3-diphenylbenzo[g]quinoxaline monomers have been synthesized via a Stille reaction. The effect of different functional groups attached to bis(2-thienyl)-2,3-diphenylbenzo[g]quinoxaline was investigated and compared with their optical, electrochemical, hole mobility, and photovoltaic properties. Polymer solar cell (PSC) devices of the copolymers were fabricated with a configuration of ITO/ PEDOT: PSS/copolymers: PCBM (1:4 wt ratio)/Ca/Al. The best performance of the PSC device was obtained by using PbttpmobQ as the active layer. A power conversion efficiency of 1.42% with an open-circuit voltage of 0.8 V, a short-circuit current (JSC) of 5.73 mA cm -2, and a fill factor of 30.9% was achieved under the illumination of AM 1.5, 100 mW cm-2.

Original languageEnglish
Pages (from-to)662-670
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume49
Issue number3
DOIs
Publication statusPublished - 2011 Feb 1

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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