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A small molecule donor containing a non-fused ring core for all-small-molecule organic solar cells with high efficiency over 11%

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Abstract

A novel p-type organic semiconductor (p-OS), P2TBR, based on a non-fused ring structure of thiophene–benzene–thiophene (TBT) as the core and 2D-conjugated benzodithiophene (BDT) units as π spacers and 3-ethylrhodanines as terminal groups, was synthesized and used as the donor material for all-small-molecule organic solar cells (SM-OSCs). P2TBR shows strong absorption, a low-lying HOMO energy level, high hole mobility and good thermal stability. The optimized P2TBR:IDIC film exhibits face-on and edge-on co-existent texture and three dimensional (3D) charge pathway, which is far better than the face-on orientated blend film without any treatment. As a result, a notable power conversion efficiency (PCE) of 11.5% and a satisfactory fill factor (FF) of 70.1% are achieved. This efficiency is the highest PCE for non-fullerene SM-OSCs reported in the literature so far. Overall, the results indicate that P2TBR is a promising candidate p-OS donor material for use in SM-OSCs, and the molecular design strategy for P2TBR provides the possibility that the simple-structured and easy to chemically modify non-fused unit can also be used as a building block in high performance p-OS donors.

Graphical abstract: A small molecule donor containing a non-fused ring core for all-small-molecule organic solar cells with high efficiency over 11%

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Publication details

The article was received on 28 Nov 2018, accepted on 11 Jan 2019 and first published on 14 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA11441B
Citation: J. Mater. Chem. A, 2019, Advance Article

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    A small molecule donor containing a non-fused ring core for all-small-molecule organic solar cells with high efficiency over 11%

    X. Li, Y. Wang, Q. Zhu, X. Guo, W. Ma, X. Ou, M. Zhang and Y. Li, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA11441B

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