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High-performance ternary organic solar cells with photoresponses beyond 1000 nm

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Abstract

Panchromatic ternary organic solar cells with photoresponses beyond 1000 nm were fabricated using low-bandgap polymer PTB7-Th as a donor and ultralow-bandgap F8IC and mid-bandgap IDT-2BR as nonfullerene acceptors. A ternary device with 20% IDT-2BR content in acceptors exhibits a power conversion efficiency of 12.1%, higher than that of its parent binary devices based on PTB7-Th/F8IC (10.3%) and PTB7-Th/IDT-2BR (7.31%). The third component IDT-2BR simultaneously improves the open-circuit voltage (VOC), short-circuit current density (JSC) and fill factor (FF) of the PTB7-Th/F8IC blend. The voltage loss is reduced by the smaller energy offset for charge separation and new charge transport pathway for less charge recombination. Complementary light absorption is beneficial for enhanced JSC. Co-existence of face-on molecular packing of F8IC and IDT-2BR leads to higher mobilities and more balanced charge transport, which contribute to the improved FF.

Graphical abstract: High-performance ternary organic solar cells with photoresponses beyond 1000 nm

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Publication details

The article was received on 17 Sep 2018, accepted on 05 Nov 2018 and first published on 06 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA09042D
Citation: J. Mater. Chem. A, 2018, Advance Article
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    High-performance ternary organic solar cells with photoresponses beyond 1000 nm

    P. Xue, Y. Xiao, T. Li, S. Dai, B. Jia, K. Liu, J. Wang, X. Lu, R. P. S. Han and X. Zhan, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA09042D

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