Multifunctional ytterbium oxide buffer for perovskite solar cells

Peng Chen, Yun Xiao, Juntao Hu, Shunde Li, Deying Luo (), Rui Su, Pietro Caprioglio, Pascal Kaienburg, Xiaohan Jia, Nan Chen, Jingjing Wu, Yanping Sui, Pengyi Tang, Haoming Yan, Tianyu Huang, Maotao Yu, Qiuyang Li, Lichen Zhao, Cheng-Hung Hou, Yun-Wen You, Jing-Jong Shyue, Dengke Wang, Xiaojun Li, Qing Zhao, Qihuang Gong (), Zheng-Hong Lu (), Henry J. Snaith () and Rui Zhu ()
Additional contact information
Peng Chen: Peking University
Yun Xiao: University of Oxford
Juntao Hu: Yunnan University
Shunde Li: Peking University
Deying Luo: University of Toronto
Rui Su: Peking University
Pietro Caprioglio: University of Oxford
Pascal Kaienburg: University of Oxford
Xiaohan Jia: Peking University
Nan Chen: Yunnan University
Jingjing Wu: Chinese Academy of Sciences
Yanping Sui: Chinese Academy of Sciences
Pengyi Tang: Chinese Academy of Sciences
Haoming Yan: Peking University
Tianyu Huang: Peking University
Maotao Yu: Peking University
Qiuyang Li: Peking University
Lichen Zhao: Peking University
Cheng-Hung Hou: Academia Sinica
Yun-Wen You: Academia Sinica
Jing-Jong Shyue: Academia Sinica
Dengke Wang: Yunnan University
Xiaojun Li: Chinese Academy of Sciences
Qing Zhao: Peking University
Qihuang Gong: Peking University
Zheng-Hong Lu: Yunnan University
Henry J. Snaith: University of Oxford
Rui Zhu: Peking University

Nature, 2024, vol. 625, issue 7995, 516-522

Abstract: Abstract Perovskite solar cells (PSCs) comprise a solid perovskite absorber sandwiched between several layers of different charge-selective materials, ensuring unidirectional current flow and high voltage output of the devices1,2. A ‘buffer material’ between the electron-selective layer and the metal electrode in p-type/intrinsic/n-type (p-i-n) PSCs (also known as inverted PSCs) enables electrons to flow from the electron-selective layer to the electrode3–5. Furthermore, it acts as a barrier inhibiting the inter-diffusion of harmful species into or degradation products out of the perovskite absorber6–8. Thus far, evaporable organic molecules9,10 and atomic-layer-deposited metal oxides11,12 have been successful, but each has specific imperfections. Here we report a chemically stable and multifunctional buffer material, ytterbium oxide (YbOx), for p-i-n PSCs by scalable thermal evaporation deposition. We used this YbOx buffer in the p-i-n PSCs with a narrow-bandgap perovskite absorber, yielding a certified power conversion efficiency of more than 25%. We also demonstrate the broad applicability of YbOx in enabling highly efficient PSCs from various types of perovskite absorber layer, delivering state-of-the-art efficiencies of 20.1% for the wide-bandgap perovskite absorber and 22.1% for the mid-bandgap perovskite absorber, respectively. Moreover, when subjected to ISOS-L-3 accelerated ageing, encapsulated devices with YbOx exhibit markedly enhanced device stability.

Date: 2024
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DOI: 10.1038/s41586-023-06892-x

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