Ladder-type high gap conjugated polymers based on indacenodithieno[3,2-b]thiophene and bithiazole for organic photovoltaics
Journal article, 2019

© 2019 Elsevier B.V. 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).

Organic solar cells

Indoor photovoltaics

High gap polymers




Asfaw Negash

Addis Ababa University

Universiteit Hasselt

Zewdneh Genene

Ambo University

Addis Ababa University

Raghavendran Thiruvallur Eachambadi

Universiteit Hasselt

Pieter Verstappen

Universiteit Hasselt

Niko Van Den Brande

Vrije Universiteit Brussel (VUB)

Jurgen Kesters

Universiteit Hasselt

Jan D'haen

Universiteit Hasselt

Ergang Wang

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Ergang Wang Group

K. Vandewal

International Medical Equipment Collaborative

Universiteit Hasselt

Wouter Maes

International Medical Equipment Collaborative

Universiteit Hasselt

Jean Manca

Universiteit Hasselt

W. Mammo

Addis Ababa University

Shimelis Admassie

Addis Ababa University

Organic Electronics: physics, materials, applications

1566-1199 (ISSN)

Vol. 74 211-217

Subject Categories

Other Physics Topics

Other Electrical Engineering, Electronic Engineering, Information Engineering

Condensed Matter Physics



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