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.


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, Ergang Wang Group

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

2050-7534 (ISSN)

Vol. 7 11 3375-3384

Subject Categories

Polymer Chemistry

Materials Chemistry

Other Chemistry Topics



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