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. 2022 Apr 11;14(8):1554.
doi: 10.3390/polym14081554.

Synthesis of a Low-Cost Thiophene-Indoloquinoxaline Polymer Donor and Its Application to Polymer Solar Cells

Yiping Guo  1 , Zeyang Li  1 , Mengzhen Sha  2 , Ping Deng  1   3 , Xinyu Lin  1 , Jun Li  1 , Liang Zhang  1 , Hang Yin  2 , Hongbing Zhan  1
Affiliations

Synthesis of a Low-Cost Thiophene-Indoloquinoxaline Polymer Donor and Its Application to Polymer Solar Cells

Yiping Guo et al. Polymers (Basel). .

Abstract

A simple wide-bandgap conjugated polymer based on indoloquinoxaline unit (PIQ) has been newly designed and synthesized via cheap and commercially available starting materials. The basic physicochemical properties of the PIQ have been investigated. PIQ possesses a broad and strong absorption band in the wavelength range of 400~660 nm with a bandgap of 1.80 eV and lower-lying highest occupied molecular orbital energy level of -5.58 eV. Polymer solar cells based on PIQ and popular acceptor Y6 blend display a preliminarily optimized power conversion efficiency of 6.4%. The results demonstrate indoloquinoxaline is a promising building unit for designing polymer donor materials for polymer solar cells.

Keywords: indoloquinoxaline; low-cost polymer donor; polymer solar cells; wide-bandgap polymer.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) BDT-based and (b) thiophene-based polymer donors; (c) molecular design strategy of the indoloquinoxaline-based polymer.
Scheme 1
Scheme 1
Synthetic routes of the PIQ.
Figure 2
Figure 2
(a) Normalized UV-vis absorption spectra of monomer 3 and polymer PIQ in chlorobenzene solutions and PIQ as thin film (insert, photograph); (b) UV-vis absorption spectra of monomer 3 and PIQ in chlorobenzene solutions.
Figure 3
Figure 3
(a) Cyclic voltammetry curve of the PIQ thin film; (b) energy level diagram of the PIQ donor and Y6 acceptor.
Figure 4
Figure 4
(a) J-V curve of the PIQ: Y6 blend-based polymer solar cells; (b) EQE spectrum of the PIQ: Y6 blend-based polymer solar cells; (c) schematic diagram of the device structure; (d) energy level diagram of the related materials.
Figure 5
Figure 5
Thin-film photoluminescence spectra of PIQ and PIQ:Y6 blend.
See this image and copyright information in PMC

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