Ladder-type high gap conjugated polymers based on indacenodithieno[3,2-b]thiophene and bithiazole for organic photovoltaics

Asfaw Negash, Zewdneh Genene, Raghavendran Thiruvallur Eachambadi, Pieter Verstappen, Niko Van den Brande, Jurgen Kesters, Jan D'Haen, Ergang Wang, Koen Vandewal, Wouter Maes, Jean Manca, Wendimagegn Mammo, Shimelis Admassie

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Two push-pull type conjugated polymers - PIDTT−BTz and PIDTT−DTBTz, based on the ladder-type donor unit indacenodithieno[3,2-b]thiophene (IDTT) and bithiazole (BTz) as acceptor component - are designed and synthesized for photovoltaic applications. The polymers exhibit relatively high optical gaps of ~2.0 eV with strong absorption in the range of 400–600 nm, rendering them of particular interest for the harvesting of indoor light and/or multijunction devices. Electrochemical investigations indicate a lower highest occupied molecular orbital energy level (−5.44 eV) for PIDTT−BTz as compared to PIDTT−DTBTz (−5.36 eV), enabling to achieve a higher open-circuit voltage. Under solar illumination, the best power conversion efficiency (5.1%) is achieved for the combination PIDTT−DTBTz:PC71BM (compared to 4.6% for PIDTT−BTz:PC71BM).
Original languageEnglish
Pages (from-to)211-217
Number of pages7
JournalOrganic Electronics
Volume74
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • Bithiazole
  • High gap polymers
  • Indacenodithieno[3,2-b]thiophene
  • Indoor photovoltaics
  • Organic solar cells

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