Highly efficient organic photovoltaics with enhanced stability through the formation of doping-induced stable interfaces

Proceedings of the National Academy of Sciences of the United States of America
Zhi JiangTakao Someya

Abstract

Flexible organic photovoltaics (OPVs) are promising power sources for wearable electronics. However, it is challenging to simultaneously achieve high efficiency as well as good stability under various stresses. Herein, we demonstrate the fabrication of highly efficient (efficiency, 13.2%) and stable OPVs based on nonfullerene blends by a single-step postannealing treatment. The device performance decreases dramatically after annealing at 90 °C and is fully recovered after annealing at 150 °C. Glass-encapsulated annealed OPVs show good environmental stability with 4.8% loss in efficiency after 4,736 h and an estimated T80 lifetime (80% of the initial power conversion efficiency) of over 20,750 h in the dark under ambient condition and T80 lifetime of 1,050 h at 85 °C and 30% relative humidity. This environmental stability is enabled by the synergetic effect of the stable morphology of donor/acceptor blends and thermally stabilized interfaces due to doping. Furthermore, the high efficiency and good stability are almost 100% retained in ultraflexible OPVs and minimodules which are mechanically robust and have long-term operation capability and thus are promising for future self-powered and wearable electronics.

References

Dec 9, 2014·Nature Communications·Jaemin KongKwanghee Lee
Feb 19, 2016·Chemical Society Reviews·Pei Cheng, Xiaowei Zhan
Dec 23, 2016·Advanced Materials·William R Mateker, Michael D McGehee
Jan 24, 2018·Nature Materials·Jianhui HouFeng Gao
Apr 19, 2018·Proceedings of the National Academy of Sciences of the United States of America·Xiaomin XuTakao Someya
Aug 11, 2018·Science·Lingxian MengYongsheng Chen

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