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Trivalent Ni oxidation controlled through regulating lithium content to minimize perovskite interfacial recombination

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Abstract

Organic–inorganic hybrid perovskite solar cells, one of the most promising photovoltaic devices, have made great progress in their efficiency and preparation technology. In this study, uniform, highly conductive LinNiOx (0 ≤ n ≤ 1; 0< x ≤ 3) films were prepared by electrochemical deposition for a range of Li concentration. Photovoltaic performance for the perovskite solar cells was enhanced through incorporation of the ion pair of Ni3+  ↔ Ni2+ as the interfacial passivation. Depending on the amount of lithium doping, controlled interfacial oxidation was induced by Ni3+. The Li0.32NiOx inhibited charge recombination, reduced the defect density, and enhanced the photocurrent density. A maximum power conversion efficiency of 20.44% was obtained by Li0.32NiOx. Further, in the long-term, in-air stabilities of unencapsulated LinNiOx perovskite solar cells were demonstrated.

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摘要

有机-无机杂化钙钛矿太阳能电池是最有前途的光伏器件之一, 在其效率和制备技术方面取得了长足的进步. 在这项研究中, 通过电化学沉积在一定范围的锂浓度下制备了均匀, 高导电性的LinNiOx (0≤n≤1; 0<x≤3) 薄膜. 通过引入Ni3+↔Ni2+ 离子对作为界面钝化层, 钙钛矿太阳能电池的光伏性能得到增强. 根据锂掺杂量的不同, Ni3+ 会引起受控的界面氧化. Li0.32NiOx抑制了电荷复合, 降低了缺陷密度, 提高了光电流密度. Li0.32NiOx 获得了20.44% 的最大功率转换效率. 此外, 从长期来看,未封装的LinNiOx 钙钛矿太阳能电池在空气中的稳定性得到了证明.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 11772207), the Natural Science Foundation of Hebei Province (Nos. A2019210204 and E2019210292), the Special Project of Hebei Provincial Central Government Guiding Local Science and Technology Development (No. 216Z4302G), the Youth Top-notch Talents Supporting Plan of Hebei Province and the support of State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics (No. MCMS-E-0519G04).

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Authors and Affiliations

  1. School of Materials Science and Engineering, School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang, 050043, China

    Jin-Jin Zhao, Xiao Su, Zhou Mi, Ying Zhang, Hua-Jun Guo, Yi-Nan Jiao, Yu-Xia Zhang, Wei-Zhong Hao, Jing-Wei Wu & Yi Wang

  2. School of Materials Science and Engineering, Hebei Key Laboratory of Material Near Net Forming Technology, Hebei University of Science and Technology, Shijiazhuang, 050018, China

    Yan-Jun Hu

  3. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Yan Shi & Cun-Fa Gao

  4. Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA

    Guo-Zhong Cao

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  1. Jin-Jin Zhao
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Jin-Jin Zhao, Xiao Su, Zhou Mi and Ying Zhang contributed equally to this work.

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Zhao, JJ., Su, X., Mi, Z. et al. Trivalent Ni oxidation controlled through regulating lithium content to minimize perovskite interfacial recombination. Rare Met. 41, 96–105 (2022). https://doi.org/10.1007/s12598-021-01800-6

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