Fine tuning of HOMO energy levels for low-band-gap photovoltaic copolymers containing cyclopentadithienopyrrole and bithiazole units

Dhalnjaya Patra, Duryodhan Sahu, Harihara Padhy, Dhanjay Kekuda, Chih Wei Chu, Kung Hwa Wei, Hong Cheu Lin

Research output: Contribution to journalArticle

11 Citations (Scopus)


Five conjugated LBG polymers P1-P5 consisting of a DTP unit as an electron donor and various bithiazole units as electron acceptors are designed and synthesized for photovoltaic applications. The effects of the electron-deficient bithiazole derivatives on the thermal, optical, electrochemical, and photovoltaic properties are investigated. The molecular structures are confirmed and characterized. The resulting polymers have high thermal stabilities and broad absorption bands with low optical bandgaps. The hole and electron mobilities are calculated. PSC devices are fabricated utilizing the polymers as electron donors and PCBM as an electron acceptor. The PSC device with an active layer of P4:PCBM (1:1 by weight) exhibits the best power-conversion efficiency.

Original languageEnglish
Pages (from-to)1960-1970
Number of pages11
JournalMacromolecular Chemistry and Physics
Issue number18
Publication statusPublished - 15-09-2011


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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