Perovskite solar cells (PSCs) consist of a solid perovskite absorber sandwiched between multiple layers of different charge-selective materials, ensuring unidirectional current flow and high voltage output of the device. A "buffer material" between the electron-selective layer and the metal electrode in a pin PSC (also called an inverted PSC) enables electrons to flow from the electron-selective layer to the electrode. Furthermore, it acts as a barrier, inhibiting the interdiffusion of harmful substances into or degradation products from the perovskite absorber. So far, atomic layer deposition of metal oxides by evaporable organic molecules has been successful, but each has specific drawbacks.
Academician Gong Qihuang and Zhu Rui of Peking University, Henry J. Snaith of Oxford University, Academician Lu Zhenghong of Yunnan University, and Luo Ying of the University of Toronto reported a chemically stable multifunctional buffer material ytterbium oxide (YbOx), which is deposited by thermal evaporation. pin PSC. This YbOx buffer has been used in pin PSCs based on narrow-bandgap perovskite light-absorbing layers, with certified power conversion efficiencies exceeding 25%.
The researchers also demonstrated the broad applicability of YbOx in achieving efficient PSCs using various types of perovskite absorbers, with state-of-the-art efficiencies of 20.1% for wide-bandgap perovskite absorbers and 20.1% for medium-bandgap perovskite absorbers. The efficiency is 22.1%, respectively. Additionally, YbOx-encapsulated devices exhibit enhanced device stability when subjected to ISOS-L-3 accelerated aging.
Chen, P., Xiao, Y., Hu, J. et al. Multifunctional ytterbium oxide buffer for perovskite solar cells. Nature 625, 516–522 (2024).
https://doi.org/10.1038/s41586-023-06892-x
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