Multifunctional ytterbium oxide buffer for perovskite solar cells

• 成果类型: Article
• 署名作者: Chen, Peng; Xiao, Yun; Hu, Juntao; Li, Shunde; Luo, Deying; Su, Rui; Caprioglio, Pietro; Kaienburg, Pascal; Jia, Xiaohan; Chen, Nan; Wu, Jingjing; Sui, Yanping; Tang, Pengyi; Yan, Haoming; Huang, Tianyu; Yu, Maotao; Li, Qiuyang; Zhao, Lichen; Hou, Cheng-Hung; You, Yun-Wen; Shyue, Jing-Jong; Wang, Dengke; Li, Xiaojun; Zhao, Qing; Gong, Qihuang; Lu, Zheng-Hong; Snaith, Henry J.; Zhu, Rui
• 署名单位: Peking University; Peking University; Tsinghua University; Collaborative Innovation Center of Quantum Matter; University of Oxford; Yunnan University; University of Toronto; Chinese Academy of Sciences; Shanghai Institute of Microsystem & Information Technology, CAS; Academia Sinica - Taiwan; Chinese Academy of Sciences; Institute of Chemistry, CAS; Peking University; Shanxi University; Kunming Medical University
• 刊物名称: Nature
• ISSN/ISSBN: 0028-5524
• DOI: 10.1038/s41586-023-06892-x
• 发表日期: 2024-01-18
• 关键词: efficient; molecules

摘要

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. Ytterbium oxide buffer layer for use in perovskite solar cells yields a certified power conversion efficiency of more than 25%, which enhances stability across a wide variety of perovskite compositions.