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New Random Terpolymers Based on Bis(4,5-didodecylthiophen-2-yl)-[1,2,5]thiadiazolo[3,4-i]dithieno[3,2-a:2',3'-c]phenazine with Variable Absorption Spectrum as Promising Materials for Organic Solar Cells

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Abstract

A series of new random terpolymers was synthesized by copolymerization of one electron-donor alkyl-substituted benzodithiophene unit and two electron-acceptor units, diketopyrrolopyrrole (DPP) and bis(4,5-dodecylthiophen-2-yl)-[1,2,5]thiadiazol[3,4-i]dithieno[3,2-a:2',3'-c]phenazine (DF). The influence of the DPP/DF ratio on the thermal, optoelectronic, and electrochemical properties of the terpolymers was investigated using thermogravimetric analysis, UV-Vis spectroscopy, and cyclic voltammetry. The optical properties of the synthesized terpolymers were controlled by varying the DPP/DF ratio. An increase in the DF mole fraction in the polymer chain caused an increase in absorption intensity in the 300‒600 and 600‒1100 nm ranges, while increasing mole fraction of DPP resulted in stronger absorption in the 600‒900 nm range and lower absorption intensity in the 350‒600 nm range. The terpolymers exhibited broad and intense absorption over the spectral range from 300 to 1100 nm. The results demonstrate that random terpolymers with complementary absorption spectra have a great potential for increasing the photocurrent and efficiency of polymer solar cells.

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ACKNOWLEDGMENTS

NMR spectroscopy studies and elemental analysis were supported by the Ministry of Science and Higher Education of the Russian Federation and were performed using research equipment of the Center of Investigation of Molecular Structure at the Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences.

Funding

This study was supported by the Russian Foundation for Basic Research (project nos. 18-53-80066 and 18-29-23004).

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Authors and Affiliations

  1. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991, Moscow, Russia

    M. L. Keshtov, S. A. Kuklin,  A. R. Khokhlov, D. Yu. Godovsky, I. O. Konstantinov & I. E. Ostapov

  2. Moscow State University, 119991, Moscow, Russia

    A. R. Khokhlov & I. E. Ostapov

  3. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun, China

    Zh. Xie

  4. The LNM Institute for Information Technology, Department of Physics, Jamdoli, Jaipur, India

    G. D. Sharma

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  1. M. L. Keshtov
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  2. S. A. Kuklin
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  3. A. R. Khokhlov
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  4. D. Yu. Godovsky
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  5. I. O. Konstantinov
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  6. I. E. Ostapov
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  7. Zh. Xie
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  8. G. D. Sharma
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Correspondence to M. L. Keshtov.

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Translated by Z. Svitanko

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Keshtov, M.L., Kuklin, S.A., Khokhlov, A.R. et al. New Random Terpolymers Based on Bis(4,5-didodecylthiophen-2-yl)-[1,2,5]thiadiazolo[3,4-i]dithieno[3,2-a:2',3'-c]phenazine with Variable Absorption Spectrum as Promising Materials for Organic Solar Cells. Dokl Phys Chem 496, 1–7 (2021). https://doi.org/10.1134/S0012501621010024

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