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
Indacenodithieno[3,2-b]thiophene
Bithiazole
Author
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
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. 74 211-217Subject Categories
Other Physics Topics
Other Electrical Engineering, Electronic Engineering, Information Engineering
Condensed Matter Physics
DOI
10.1016/j.orgel.2019.07.010