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Study of photovoltaic performances for asymmetrical and symmetrical chlorinated thiophene-bridge-based conjugated polymers

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Abstract

Two conjugated donor polymers (PB2F-Cl and PB2F-2Cl) based on benzo[1,2-b:4,5-b′]dithiophene and benzo[1,2-c:4,5-c′]dithiophene-4,8-dione with asymmetrical and symmetrical chlorinated thiophene-bridges were designed and synthesized. Both polymers exhibited extremely deep HOMO levels of −5.50 and −5.56 eV for PB2F-Cl and PB2F-2Cl, respectively. Although PB2F-Cl had a more planar conjugated backbone, PB2F-Cl exhibited a weaker aggregation behaviour than PB2F-2Cl in chlorobenzene solution due to its regioirregular conjugated backbone. After blending with an IT-4F acceptor, the PB2F-Cl:IT-4F film exhibited a slightly stronger lamellar stacking and a weaker π stacking compared to the PB2F-2Cl:IT-4F film as confirmed by grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements. In PSCs, the power conversion efficiency (PCE) of the PB2F-Cl:IT-4F-based PSC was 10.81%, while the PCE of the PB2F-2Cl:IT-4F-based PSC reached 12.79%.

Graphical abstract: Study of photovoltaic performances for asymmetrical and symmetrical chlorinated thiophene-bridge-based conjugated polymers

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Supplementary files

Article information


Submitted
13 Oct 2019
Accepted
23 Dec 2019
First published
24 Dec 2019

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Study of photovoltaic performances for asymmetrical and symmetrical chlorinated thiophene-bridge-based conjugated polymers

K. Ma, C. An, T. Zhang, Q. Lv, S. Zhang, P. Zhou, J. Zhang and J. Hou, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05610F

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