NiO_x Nanocrystals with Tunable Size and Energy Levels for Efficient and UV Stable Perovskite Solar Cells

Xiaxia Cui; Junjun Jin; Junjie ZouQiang TangYuan AiXiang ZhangZhen WangYuan ZhouZhenkun ZhuGuanqi TangQiang CaoSheng LiuXiaowei LiuQidong Tai

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NiO_x Nanocrystals with Tunable Size and Energy Levels for Efficient and UV Stable Perovskite Solar Cells

机译：NiO_x Nanocrystals with Tunable Size and Energy Levels for Efficient and UV Stable Perovskite Solar Cells

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Solution-processed nickel oxide nanocrystals (NiO_x NCs) ink can be facilelyapplied to deposit NiO_x thin films as the hole transport layer (HTL) forperovskite solar cells (PSCs). Both the efficiency and stability of the correspondingPSCs depend significantly on the size and the energy levels of theas-synthesized NiO_x NCs; however, previous studies have shown that thesetwo aspects can be hardly controlled synchronously to maximize the deviceperformance. Herein, a novel synthesis of highly dispersed NiO_x NCs isdemonstrated by employing tetraalkylammonium hydroxides (TAAOHs, alkyl= methyl, ethyl, propyl, butyl) as precipitating bases, where the varied alkylchain lengths of TAAOHs enable the size control of the NiO_x NCs and thesubsequent altering of their Ni~(3+) contents, leading to tunable energy levelsof the NiO_x thin films. With the longest butyl chain, the smallest crystal sizeand the optimal energy level alignment at the NiO_x/perovskite interface areachieved. After further passivating the detrimental Ni~(3+) species on the surfaceof NiO_x HTL, a remarkable power conversion efficiency (PCE) approaching23% is obtained, which is one of the highest PCEs reported for NiO_x-basedinverted PSCs. Furthermore, the unencapsulated device exhibits excellentultraviolet stability, which maintains ≈87% of its PCE after 200 h exposure.

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来源
《Advanced functional materials》 |2022年第31期|2203049.1-2203049.8|共8页
作者
Xiaxia Cui; Junjun Jin; Junjie ZouQiang TangYuan AiXiang ZhangZhen WangYuan ZhouZhenkun ZhuGuanqi TangQiang CaoSheng LiuXiaowei LiuQidong Tai;
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作者单位

The Institute of Technological SciencesWuhan UniversityWuhan 430072, P. R. China;

School of Mechanical Science & EngineeringHuazhong University of Science and TechnologyWuhan 430074, P. R. China;

Institute of PhotovoltaicSouthwest Petroleum UniversityChengdu 610500, P. R. China;

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正文语种英语
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energy levels; hole transport layers; NiO_x nanocrystals; perovskite solar cells; stability; tunable size;

NiO_x Nanocrystals with Tunable Size and Energy Levels for Efficient and UV Stable Perovskite Solar Cells

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