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Comparative analysis of burn-in photo-degradation in non-fullerene COi8DFIC acceptor based high-efficiency ternary organic solar cells

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Abstract

The ternary organic solar cell is a promising technology towards high power conversion efficiency. Although the efficiency has reached over 14% for ternary organic solar cells, the stability, as well as the degradation mechanism behind the ternary strategy, are still not well investigated. Burn-in photo-degradation, which is caused by continuous light illumination, can result in a significant performance drop at an initial stage for solar cells. COi8DFIC is a newly developed efficient non-fullerene acceptor material that exhibits strong near infrared range (NIR) light absorption. Herein, we present the first systematic research on the burn-in photo-degradation of a COi8DFIC based ternary organic solar cell with the active layer consisting of PTB7-Th:COi8DFIC:PC71BM blend and compared it with its corresponding binary organic solar cells. Both binary and ternary devices were exposed to continuous one-sun illumination for 5 hours. As a result, PTB7-Th:COi8DFIC based binary and ternary organic solar cells exhibit a similar degradation mechanism which is very different from the burn-in photo-degradation mechanism in PTB7-Th:PC71BM based binary organic solar cells. The burn-in photo-degradation in PTB7-Th:PC71BM binary organic solar cells is found to be dominated by induced non-radiative carrier recombination, poor energy transfer and low exciton dissociation. However, the burn-in photo-degradation in PTB7-Th:COi8DFIC based binary and ternary organic solar cells is found to be more related to the degradation-induced high shunt possibility.

Graphical abstract: Comparative analysis of burn-in photo-degradation in non-fullerene COi8DFIC acceptor based high-efficiency ternary organic solar cells

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Publication details

The article was received on 01 Mar 2019, accepted on 03 Apr 2019 and first published on 05 Apr 2019


Article type: Research Article
DOI: 10.1039/C9QM00130A
Mater. Chem. Front., 2019, Advance Article

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    Comparative analysis of burn-in photo-degradation in non-fullerene COi8DFIC acceptor based high-efficiency ternary organic solar cells

    L. Duan, X. Meng, Y. Zhang, H. Yi, K. Jin, F. Haque, C. Xu, Z. Xiao, L. Ding and A. Uddin, Mater. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QM00130A

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