Citation: Chenyi Yang, Shaoqing Zhang, Junzhen Ren, Pengqing Bi, Xiaotao Yuan, Jianhui Hou. Fluorination strategy enables greatly improved performance for organic solar cells based on polythiophene derivatives[J]. Chinese Chemical Letters, ;2021, 32(7): 2274-2278. doi: 10.1016/j.cclet.2021.03.006 shu

Fluorination strategy enables greatly improved performance for organic solar cells based on polythiophene derivatives

Chenyi Yang ^{a, b} ,
Shaoqing Zhang ^{a, b, *,} ,
Junzhen Ren ^b ,
Pengqing Bi ^b ,
Xiaotao Yuan ^{a, *,} ,
Jianhui Hou ^{a, b}

a.
School of Chemistry and Biology Engineering, University of Science and Technology Beijing, Beijing 100083, China
b.
State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

shaoqingz@iccas.ac.cn

yuanxt@ustb.edu.cn

Received Date: 10 February 2021
Revised Date: 1 March 2021
Accepted Date: 2 March 2021
Available Online: 4 March 2021

Figures(5)

The power conversion efficiencies (PCEs) of organic solar cells (OSCs) have reached 18% recently, which have already met the demand of practical application. However, these outstanding results were generally achieved with donor-acceptor (D-A) type copolymer donors, which can hardly fulfill the low-cost large-scale production due to their complicated synthesis processes. Therefore, developing polymer donors with simple chemical structures is urgent for realizing low-cost OSCs. Polythiophene (PT) derivatives are currently regarded as promising candidates for such kind of donor materials, which has been illustrated in many works. In this work, two new alkylthio substituted PT derivatives, P301 and P302, were synthesized and tested as donors in the OSCs using Y5 as the acceptor. In comparison, the introduction of fluorine atoms on the backbone of P302 can not only downshift the energy levels, but also greatly improve the phase separation morphologies of the active layers, which is ascribed to the enhanced aggregation effect and the reduced miscibility with the non-fullerene acceptor. As a result, the P302:Y5-based OSC exhibits a significantly improved PCE of 9.65% than that of P301:Y5-based one, indicating the important role of fluorination in the construction of efficient PT derivative donors.
- Organic solar cells,
- Polythiophene derivatives,
- Fluorination,
- Aggregation effect,
- Miscibility
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