Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/27885
Title: Diketopyrrolopyrrole-based terpolymers with tunable broad band absorption for fullerene and fullerene-free polymer solar cells
Authors: NEGASH ASSEGDE, Asfaw 
Genene, Zewdneh
THIRUVALLUR EACHAMBADI, Ragha 
KESTERS, Jurgen 
Van den Brande, Niko
D'HAEN, Jan 
PENXTEN, Huguette 
Abdulahi, Birhan A.
Wang, Ergang
VANDEWAL, Koen 
MAES, Wouter 
Mammo, Wendimagegn
MANCA, Jean 
Admassie, Shimelis
Issue Date: 2019
Source: Journal of Materials Chemistry C, 7 (11), p. 3375-3384
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 electrondonating 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 cm2 . 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 shortcircuit current density of 17.5 mA cm2 , 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.
Notes: Negash, A (reprint author), Addis Ababa Univ, Dept Chem, POB 33658, Addis Ababa, Ethiopia. Hasselt Univ, Inst Mat Res IMO IMOMEC, Agoralaan 1, B-3590 Diepenbeek, Belgium. asfaw.negashassegde@uhasselt.be; wouter.maes@uhasselt.be
Document URI: http://hdl.handle.net/1942/27885
ISSN: 2050-7526
e-ISSN: 2050-7534
DOI: 10.1039/C8TC06407E
ISI #: 000461443500029
Rights: The Royal Society of Chemistry 2019
Category: A1
Type: Journal Contribution
Appears in Collections:Research publications

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