New donor–acceptor copolymers with ultra-narrow band gap for photovoltaic application

Two novel donor–acceptor (D–A) copolymers P1 and P2 with the thiazoloquinoxaline repeating acceptor moiety and different donor moieties of benzo[1,2- b :4,5- b ']dithiophene and isomeric benzo[2,1- b :3,4- b ']dithiophene have been prepared. The polymers show light absorption at 300–1200 n...

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Veröffentlicht in:Doklady. Chemistry 2016-10, Vol.470 (2), p.283-288
Hauptverfasser: Keshtov, M. L., Godovskii, D. Yu, Kuklin, S. A., Wang, Leeyih, Konstantinov, I. O., Krayushkin, M. M., Khokhlov, A. R.
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container_end_page 288
container_issue 2
container_start_page 283
container_title Doklady. Chemistry
container_volume 470
creator Keshtov, M. L.
Godovskii, D. Yu
Kuklin, S. A.
Wang, Leeyih
Konstantinov, I. O.
Krayushkin, M. M.
Khokhlov, A. R.
description Two novel donor–acceptor (D–A) copolymers P1 and P2 with the thiazoloquinoxaline repeating acceptor moiety and different donor moieties of benzo[1,2- b :4,5- b ']dithiophene and isomeric benzo[2,1- b :3,4- b ']dithiophene have been prepared. The polymers show light absorption at 300–1200 nm and a band gap width of 0.98 and 1.14 eV, respectively. The energies of the HOMO (–5.42 and–5.29 eV) and LUMO (–3.90 and–3.83 eV) levels of polymers P1 and P2 have been determined. The absorption maximum for polymer P1 in the long-wavelength region is red-shifted by 161 nm, which is caused by stronger charge transfer in P1 as compared with P2 . This fact indicates that the benzo[1,2- b :4,5- b ']dithiophene structural moiety has a higher electron-donating ability than the benzo[2,1- b :3,4- b ']dithiophene moiety. The red shift of the absorption spectrum of polymer P1 in comparison with that of P2 indicates that interchain π–π stacking interactions are more efficient in P1 than in P2 .
doi_str_mv 10.1134/S0012500816100013
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subjects Absorption spectra
Charge transfer
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Copolymers
Doppler effect
Electromagnetic absorption
Energy gap
Industrial Chemistry/Chemical Engineering
Molecular orbitals
Polymers
Red shift
title New donor–acceptor copolymers with ultra-narrow band gap for photovoltaic application
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