Communications

New metal-free dye with an acceptor-anchor group of thieno[3,2-b]thiophene family for dye-sensitized solar cells

R. A. Irgashev^a, A. S. Steparuk^a, V. V. Emets^b, E. V. Tekshina^c, N. M. Tolkach^d, P. I. Lazarenko^d, G. L. Rusinov^a, S. A. Kozyukhin<sup>c

a</sup> I. Ya. Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 620137 Ekaterinburg, Russian Federation
^b A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russian Federation
^c N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation
^d National Research University of Electronic Technology, 124498 Zelenograd, Moscow, Russian Federation

Abstract: 5-Methylene-6-oxo-5,6-dihydrothieno[3,2-b]thiophene-2-carboxylic acid was proposed as an electron-accepting unit in the design of organic donor–π–acceptor dye molecules. New organic dye incorporating a thieno[3,2-b]indole donor, a thiophene π-linker, and the abovementioned acceptor moiety was synthesized and evaluated as a photosensitizer for dye-sensitized solar cells. The photovoltaic device based on this dye achieved a power conversion efficiency of 0.95% with a short-circuit current density of 2.81 mA cm^–2, an opencircuit voltage of 0.54 V, and a fill factor of 0.63 under standard AM 1.5 G solar irradiation (100 mW cm^–2).

Keywords: thieno[3,2-b]thiophene, thieno[3,2-b]indole, D–π–A structure, metal-free organic dyes, dye-sensitized solar cells.

Received: 11.06.2025
Accepted: 08.08.2025

Language: English

DOI: 10.71267/mencom.7849

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