40.1% Record Low-Light-Solar-Cell-Efficiency by Holistic Trap-Passivation using Micron-Thick Perovskite Film
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作者:Xilai He, Jiangzhao Chen, Xiaodong Ren,* Lu Zhang, Yucheng Liu, Jiangshan Feng, Junjie Fang, Kui Zhao,* Shengzhong (Frank) Liu*
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发布时间: 1489天前
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826 次浏览
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Xilai He, Jiangzhao Chen, Xiaodong Ren,* Lu Zhang, Yucheng Liu, Jiangshan Feng, Junjie Fang, Kui Zhao,* Shengzhong (Frank) Liu,* Adv. Mater. 2021, adma.202100770.
Abstract:
Perovskite solar cells exhibit not only high efficiency under full AM1.5 sunlight, but also great potential for applications in low light environment, such as indoor, cloudy, early morning and late evening, etc. Unfortunately, their performance stills suffer severe trap-induced nonradiative recombination, particularly under low light condition. Here, we developed a holistic passivation strategy to reduce traps both on the surface and in the bulk of micron-thick perovskite film, leading to a record efficiency of 40.1% under 301.6 μW cm-2 warm LED light for low-light-solar-cell applications. The involvement of guanidinium (GA) into the perovskite bulk film and CH3O-PEABr passivation on the perovskite surface synergistically suppress the trap states. The charge lifetimes of the perovskite film increase by 10-fold and 5-fold to 981 ns and 8.02 μs at the crystal surface and in its bulk, respectively. The decreased nonradiative recombination loss translates to a high open-circuit voltage (Voc) of 1.00 V, a high short-circuit current (Jsc) of 152.10 μA cm-2, and a fill factor (FF) of 79.52%. Note that this performance also stands as the highest among all photovoltaics measured under indoor light illumination. This work of trap passivation for micron-thick perovskite film paves a way for high performance, self-powered IoT devices.
