Citation: Jiabin Zhang, Xiaoke Zhang, Lilei Wang, Lingpeng Yan, Xueli Cheng, Tao Li. Fluorinated fused azobenzene boron-based polymer acceptors with 1000 nm absorbance edges for all-polymer solar cells[J]. Chinese Chemical Letters, ;2025, 36(7): 111064. doi: 10.1016/j.cclet.2025.111064 shu

Fluorinated fused azobenzene boron-based polymer acceptors with 1000 nm absorbance edges for all-polymer solar cells

Jiabin Zhang ^{a, 1} ,
Xiaoke Zhang ^{b, 1} ,
Lilei Wang ^c ,
Lingpeng Yan ^{b, *,} ,
Xueli Cheng ^{c, *,} ,
Tao Li ^{a, *,}

a.
School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, China
b.
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
c.
School of Chemistry and Chemical Engineering, Taishan University, Taian 271000, China

yanlingpeng@tyut.edu.cn

x_cheng@tsu.edu.cn

litao1983@sjtu.edu.cn

Received Date: 2 December 2024
Revised Date: 17 February 2025
Accepted Date: 10 March 2025
Available Online: 11 March 2025

Figures(5)

Fluorinated fused azobenzene boron (FBAz) is a novel electron-deficient building block for polymer electron acceptors in all-polymer solar cells (all-PSC). The B←N bridging units impart a fixed configuration and low-lying LUMO/HOMO energy. Three polymer acceptor materials (P2f, P3f and P5f) with different fluorine substitution positions by copolymerizing FBAz with indacenodithiophene (IDT), are synthesized and investigated to study the influence of fluorinated forms on the all-polymer solar cell performance. The FBAz units are synthesized in just three steps, facilitating the straightforward production of polymer acceptors P2f, P3f, and P5f. These acceptors exhibit strong light absorption in the visible to near-infrared range of 500–1000 nm and possess suitable LUMO/HOMO energy levels of -3.99/-5.66 eV which are very complementary to that (E_LUMO/HOMO = -3.59/-5.20 eV) of the widely-used polymer donor poly[(ethylhexylthiophenyl)-benzodithiophene-(ethylhexyl)-thienothiophene] (PTB7-Th). All-polymer solar cells (all-PSCs) with PTB7-Th as electron donor and P3f as electron acceptor exhibits highest power conversion efficiencies (PCE) 2.70%. When PC₆₁BM is added as the third component, the device efficiency can reach 5.36%. These preliminary results indicate that FBAz is a promising strong electron acceptor for the development of n-type polymer semiconductors, especially in organic photovoltaics (OPVs). To the best of our knowledge, this is the first example demonstrating the unique photovoltaic properties of the N=N double bond as an acceptor material.
- All-polymer solar cells,
- Fluorinated fused azobenzene boron,
- N=N double bond,
- B←N coordination bond,
- Near-infrared absorption
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