Diketopyrrolopyrrole-based terpolymers with tunable broad band absorption for fullerene and fullerene-free polymer solar cells

Asfaw Negash, Zewdneh Genene, Raghavendran Thiruvallur Eachambadi, Jurgen Kesters, Niko Van den Brande, Jan D'Haen, Huguette Penxten, Birhan A. Abdulahi, Ergang Wang, Koen Vandewal, Wouter Maes, Wendimagegn Mammo, Jean Manca, Shimelis Admassie

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13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3375-3384
Number of pages10
JournalJournal of Materials Chemistry C
Volume7
Issue number11
DOIs
Publication statusPublished - 21 Mar 2019

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