Citation: Yu Zhi-Peng, Li Xue, He Chengliang, Wang Di, Qin Ran, Zhou Guanqing, Liu Zhi-Xi, Andersen Thomas Rieks, Zhu Haiming, Chen Hongzheng, Li Chang-Zhi. High-efficiency organic solar cells with low voltage-loss of 0.46 V[J]. Chinese Chemical Letters, ;2020, 31(7): 1991-1996. doi: 10.1016/j.cclet.2019.12.003 shu

High-efficiency organic solar cells with low voltage-loss of 0.46 V

a.
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, State Key Laboratory of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
b.
Department of Chemistry, Zhejiang University, Hangzhou 310027, China

czli@zju.edu.cn

Received Date: 15 November 2019
Revised Date: 23 November 2019
Accepted Date: 2 December 2019
Available Online: 3 December 2019

Figures(4)

The recent evolution of active components yielded brilliant progresses for organic solar cells (OSCs), yet the mechanism is needed to be clearly understood. In this work, two electron acceptors, a linear SN6-2Br and a V-shaped BTP-2Br, are developed with nitrogen atoms introduced to replace the traditional sp³-hybridized carbon in the fused ring. BTP-2Br possesses an electron-deficient central core, which exhibits slightly blue-shifted absorption as well as deepened HOMO-level compared with SN6-2Br. The corresponding photovoltaic performance from V-shaped BTP-2Br based devices exhibit superior performance especially in short-circuit current (J_sc), despite an enhanced absorption and charge carrier mobilities for SN6-2Br. The primary reason for the higher J_sc from BTP-2Br is faster exciton diffusion and dissociation in blends, than those of SN6-2Br. As a result, PBDB-TF:BTP-2Br based devices achieve a power conversion efficiency (PCE) of 13.84% with an voltage-loss of only 0.46 V, which is one of the lowest values ever reported. Moreover, we fabricated semitransparent OSCs that exhibit an excellent PCE of 9.62% with average visible transparency of 20.1%.
- Organic solar cells,
- High efficiency,
- Low voltage-loss,
- Semitransparent OSCs,
- Electron-defficient central core
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1.
沈阳化工大学材料科学与工程学院沈阳 110142