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Improved Photocurrent and Efficiency of Non-fullerene Organic Solar Cells Despite Higher Charge Recombination

Abstract

Organic solar cells (OSCs) with a fused-ring dye, ITIC, and fullerene derivative PC71BM as the acceptor materials were fabricated. Compared to PC71BM-based cells, which reach a power conversion efficiency of 6.91%, the ITIC device shows a significantly higher power conversion efficiency (9.20%). The broader absorption range of ITIC helps to improve the short-circuit current density, which leads to better device efficiency. Electrical characterizations, including electrical simulations and impedance analysis, were performed to investigate the physical processes in these OSCs. The results suggest that charge-recombination loss in the non-fullerene device is even higher than in PC71BM cells. The morphological analysis reveals that a poor phase-separation in the photoactive layer is responsible for the large recombination loss. Our results indicate that fused-ring acceptor materials are promising candidates for high-efficiency OSCs. Furthermore, if recombination loss could be suppressed effectively, the energy conversion efficiency of non-fullerene organic solar cells can be even higher.

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Publication details

The article was received on 25 Aug 2017, accepted on 01 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA07501D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Improved Photocurrent and Efficiency of Non-fullerene Organic Solar Cells Despite Higher Charge Recombination

    F. Liu, B. Xiao, J. Song, B. Guo, M. Zhang, W. Li, R. Zhou, J. Liu, H. Wang, M. Zhang, G. Luo and T. P. Russell, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07501D

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