Biselenophene Imide: Enabling Polymer Acceptor with High Electron Mobility for High-Performance All-Polymer Solar Cells

Suxiang Ma; Bangbang Li; Shaokuan Gong; Junwei Wang; Bin Liu; Sang Young Jeong; Xihan Chen; Han Young Woo; Kui Feng; Xugang Guo

doi:10.1002/anie.202308306

Biselenophene Imide: Enabling Polymer Acceptor with High Electron Mobility for High-Performance All-Polymer Solar Cells

Angew Chem Int Ed Engl. 2023 Sep 25;62(39):e202308306. doi: 10.1002/anie.202308306. Epub 2023 Jul 27.

Authors

Suxiang Ma¹, Bangbang Li¹, Shaokuan Gong², Junwei Wang¹, Bin Liu¹, Sang Young Jeong³, Xihan Chen², Han Young Woo³, Kui Feng^{1

4}, Xugang Guo^{1

5}

Affiliations

¹ Department of Materials Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
² Department of Mechanical and Energy Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
³ Department of Chemistry, Korea University, Seoul, 136-713, South Korea.
⁴ Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
⁵ Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China.

PMID: 37461155
DOI: 10.1002/anie.202308306

Abstract

The shortage of narrow band gap polymer acceptors with high electron mobility is the major bottleneck for developing efficient all-polymer solar cells (all-PSCs). Herein, we synthesize a distannylated electron-deficient biselenophene imide monomer (BSeI-Tin) with high purity/reactivity, affording an excellent chance to access acceptor-acceptor (A-A) type polymer acceptors. Copolymerizing BSeI-Tin with dibrominated monomer Y5-Br, the resulting A-A polymer PY5-BSeI shows a higher molecular weight, narrower band gap, deeper-lying frontier molecular orbital levels and larger electron mobility than the donor-acceptor type counterpart PY5-BSe. Consequently, the PY5-BSeI-based all-PSCs deliver a remarkable efficiency of 17.77 % with a high short-circuit current of 24.93 mA cm^-2 and fill factor of 75.83 %. This efficiency is much higher than that (10.70 %) of the PY5-BSe-based devices. Our study demonstrates that BSeI is a promising building block for constructing high-performance polymer acceptors and stannylation of electron-deficient building blocks offers an excellent approach to developing A-A type polymers for all-PSCs and even beyond.

Keywords: Acceptor; Acceptor-Acceptor Backbone; Narrow Bandgap; Polymer; Solar Cells.

Abstract

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