A low band gap co-polymer of dithienogermole and 2,1,3-benzothiadiazole by Suzuki polycondensation and its application in transistor and photovoltaic cells

Zhuping Fei, Jong Soo Kym, Jeremy Smith, Ester Buchaca Domingo, Thomas D. Anthopoulos, Natalie Stingelin, Scott E. Watkins, Ji Seon Kim*, Martin Heeney

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

We report the preparation of a 4,4′-bis(2-ethylhexyl)dithieno[3,2-b: 2′,3′-d]germole monomer and its polymerisation with 2,1,3-benzothiadiazole. Unlike the analogous dithienosilole, the dithienogermole is sufficiently stable under basic conditions to enable Suzuki polycondensation. The resulting high molecular weight polymer exhibits a high propensity to order in the solid state and demonstrates charge carrier mobilities up to 0.11 cm2 V-1 s-1 in field effect transistors. A PGeBTBT based BHJ solar cell device achieved a PCE of 4.5% with a high Jsc of 18.6 mA cm-2.

Original languageEnglish (US)
Pages (from-to)16257-16263
Number of pages7
JournalJournal of Materials Chemistry
Volume21
Issue number40
DOIs
StatePublished - Oct 28 2011

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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