Citation: Liu Wenxu, Li Weiping, Yao Jiannian, Zhan Chuanlang. Achieving high short-circuit current and fill-factor via increasing quinoidal character on nonfullerene small molecule acceptor[J]. Chinese Chemical Letters, ;2018, 29(3): 381-384. doi: 10.1016/j.cclet.2017.11.018 shu

Achieving high short-circuit current and fill-factor via increasing quinoidal character on nonfullerene small molecule acceptor

Beijing National Laboratory of Molecular Science, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Corresponding author: Zhan Chuanlang, clzhan@iccas.ac.cn

Received Date: 12 October 2017
Revised Date: 27 October 2017
Accepted Date: 14 November 2017
Available Online: 20 March 2017

Figures(6)

Recently, the fused-ring based low band gap (LBG) small molecule acceptors (SMAs) have emerged as efficient nonfullerene acceptors. So far, these LBG SMAs are mainly designed with IC (2-methylene-(3-(1, 1-dicyanomethylene)indanone)) or its analogs, the benzo-type electron-accepting (A) units. Compared to benzene, thiophene is less aromatic and thus the thiophene-involving semiconducting molecule has more quinoidal character, which effectively reduces the energy gap between the highest occupied molecular orbit (HOMO) and the lowest unoccupied molecular orbit (LUMO). Herein, we show that replacing the IC units in ITIC with the CT (cyclopenta[c]thiophen-4-one-5-methylene-6-(1, 1-dicyanomethylene)), a thiophene-fused A unit, the quinoidal character is enhanced from 0.0353 on ITIC to 0.0349 on ITCT, the CT-ended SMA. The increase in the quinoidal character reduces the optical band gap and enhances the near IR absorptivity. When blended with the wide band gap (WBG) polymer donor, PBDB-T, an average power conversion efficiency of 10.99% is obtained with a short-circuit current-density (J_sc) of 17.88 mA/cm² and a fill-factor (FF) of 0.723. For comparisons, the J_sc is of 16.92 mA/cm², FF is of 0.655 and PCE is of 9.94% obtained from the ITIC:PBDB-T device. This case indicates that the replacement of the benzene ring on the IC unit with a more polarizable five-member ring such as thiophene is an effective way to enhance the absorption of the near IR solar photons towards designing high-performance nonfullerene polymer solar cells.
- Cyclopenta[c]thiophen-4-one-5-,
- methylene-6-(1, 1-dicyanomethylene),
- Nonfullerene,
- Small molecule acceptor,
- Polymer solar cell
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