New narrow-band-gap thiazoloquinoxaline-containing polymers and their use in solar cells with bulk heterojunction


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Two new regioregular polymers P1 and P2 with structure of type D–A1–D–A2 have been prepared. The polymers exhibit strong light absorption in the range 300–1100 nm and have band gaps of 1.09 and 1.11 eV, respectively. The HOMO and LUMO energies for P1 and P2 are–5.08/–3.81 and–5.16/–3.85 eV, respectively. Polymer solar cells (PSC) based on P1: PC71BM (1: 2, v/v) and P2: PC71BM (1: 1, v/v) have open-circuit voltage Voc, short circuit current Jsc, and efficiency of 0.79 and 0.84 V, 8.32 and 9.54 mA/cm2, 3.5 and 4.7%, respectively. The PSC based on P2 exhibits higher characteristics due to the presence of fluorine atoms in the structure: their strong electron-withdrawing properties decrease the HOMO level of polymer P2 as compared with that of P1, which increases the Voc value. Moreover, the formation of additional S∙∙∙F contacts leads to the growth of ordering and crystallinity of polymer P2 as compared with P1, which favors an increase in the values of Jsc and filling factor.

Sobre autores

M. Keshtov

Nesmeyanov Institute of Organoelement Compounds

Autor responsável pela correspondência
Email: keshtov@ineos.ac.ru
Rússia, ul. Vavilova 28, Moscow, 119991

S. Kuklin

Nesmeyanov Institute of Organoelement Compounds

Email: keshtov@ineos.ac.ru
Rússia, ul. Vavilova 28, Moscow, 119991

I. Konstantinov

Nesmeyanov Institute of Organoelement Compounds

Email: keshtov@ineos.ac.ru
Rússia, ul. Vavilova 28, Moscow, 119991

M. Krayushkin

Zelinskii Institute of Organic Chemistry

Email: keshtov@ineos.ac.ru
Rússia, Leninskii pr. 47, Moscow, 119991

N. Radychev

Carl von Ossietzky University of Oldenburg

Email: keshtov@ineos.ac.ru
Alemanha, Ammerländer Heerstr. 114-118, Oldenburg, 26129

A. Khokhlov

Nesmeyanov Institute of Organoelement Compounds

Email: keshtov@ineos.ac.ru
Rússia, ul. Vavilova 28, Moscow, 119991

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