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High-performance organic solar cells based on polymer donor/small molecule donor/nonfullerene acceptor ternary blends

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Abstract

We used mid-bandgap small molecule donor TR as a third component to fabricate ternary nonfullerene organic solar cells (OSCs) based on narrow-bandgap polymer donor PTB7-Th and narrow-bandgap nonfullerene acceptor FOIC. TR exhibits full miscibility with PTB7-Th and efficient energy transfer to PTB7-Th, enhances stacking of PTB7-Th, hole mobility and charge generation of the blends, and ultimately improves device performance. Compared with the binary PTB7-Th/FOIC blend, the ternary device with 25% TR (w/w) yields simultaneously improved open-circuit voltage, short-circuit current density and fill factor. Finally, single-junction OSCs based on the ternary PTB7-Th/TR/FOIC blend yield power conversion efficiency as high as 13.1%, higher than the binary OSCs (12.1%). The ternary device efficiency exhibits high tolerance to thickness variation (>12% in the range of 80–200 nm). Transient absorption spectroscopy confirms the importance of long-range resonant energy transfer from donor to acceptor phases.

Graphical abstract: High-performance organic solar cells based on polymer donor/small molecule donor/nonfullerene acceptor ternary blends

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Publication details

The article was received on 03 Dec 2018, accepted on 08 Jan 2019 and first published on 08 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA11637G
Citation: J. Mater. Chem. A, 2019, Advance Article
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    High-performance organic solar cells based on polymer donor/small molecule donor/nonfullerene acceptor ternary blends

    S. Dai, S. Chandrabose, J. Xin, T. Li, K. Chen, P. Xue, K. Liu, K. Zhou, W. Ma, J. M. Hodgkiss and X. Zhan, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA11637G

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