Diketopyrrolopyrrole-based terpolymers with tunable broad band absorption for fullerene and fullerene-free polymer solar cells
Journal article, 2019
A series of random terpolymers with donor-acceptor-donor-acceptor molecular configuration, comprising fluorinated benzotriazole (FTAZ) and thienothiophene-capped diketopyrrolopyrrole (TTDPP) as the first and second electron-accepting moieties and thienyl-substituted benzodithiophene (BDTT) as the electron-donating unit, are designed for polymer solar cells. By tuning the ratio of TTDPP and FTAZ, the optoelectronic properties of the terpolymers are systematically varied. All materials exhibit a broad absorption window spanning from 300 to 900 nm, illustrating the success of the terpolymer approach. Fullerene-based polymer solar cells fabricated from the terpolymer with the highest content of TTDPP afford a power conversion efficiency of 5.7%, with a short-circuit current density of 15.2 mA cm -2 . On the other hand, solar cell devices composed of the terpolymer with the lowest content of TTDPP and the narrow gap non-fullerene acceptor IEICO-4F exhibit a higher efficiency of 6.3%, with an enhanced short-circuit current density of 17.5 mA cm -2 , as a result of a better complementarity in the absorption of the donor and acceptor materials and well-balanced charge carrier mobilities. This efficiency represents the best value for fullerene-free polymer solar cells based on DPP-containing polymers to date.
Author
Asfaw Negash
Addis Ababa University
Universiteit Hasselt
Zewdneh Genene
Addis Ababa University
Ambo University
Raghavendran Thiruvallur Eachambadi
Universiteit Hasselt
Jurgen Kesters
Universiteit Hasselt
Niko Van Den Brande
Vrije Universiteit Brussel (VUB)
Jan D'haen
Universiteit Hasselt
Huguette Penxten
Universiteit Hasselt
Birhan A. Abdulahi
Addis Ababa University
Ergang Wang
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
K. Vandewal
Universiteit Hasselt
Wouter Maes
Universiteit Hasselt
W. Mammo
Addis Ababa University
Jean Manca
Universiteit Hasselt
Shimelis Admassie
Addis Ababa University
Journal of Materials Chemistry C
20507526 (ISSN) 20507534 (eISSN)
Vol. 7 11 3375-3384Subject Categories
Polymer Chemistry
Materials Chemistry
Other Chemistry Topics
DOI
10.1039/c8tc06407e