機械学習が太陽電池ペロブスカイトの発見を加速する(Machine learning accelerates discovery of solar-cell perovskites)

＜関連情報＞

• https://actu.epfl.ch/news/machine-learning-accelerates-discovery-of-solar-ce/
• https://pubs.acs.org/doi/10.1021/jacs.4c03507

バンドギャップ記述子の普遍性と光起電力ペロブスカイトの発見を可能にする高品質データ High-Quality Data Enabling Universality of Band Gap Descriptor and Discovery of Photovoltaic Perovskites

Haiyuan Wang, Runhai Ouyang, Wei Chen, and Alfredo Pasquarello
Journal of the American Chemical Society  Published:May 2, 2024
DOI:https://doi.org/10.1021/jacs.4c03507

Abstract

Extensive machine-learning-assisted research has been dedicated to predicting band gaps for perovskites, driven by their immense potential in photovoltaics. Yet, the effectiveness is often hampered by the lack of high-quality band gap data sets, particularly for perovskites involving d orbitals. In this work, we consistently calculate a large data set of band gaps with a high level of accuracy, which is rigorously validated by experimental and state-of-the-art GW band gaps. Leveraging this achievement, our machine-learning-derived descriptor exhibits exceptional universality and robustness, proving effectiveness not only for single and double, halide and oxide perovskites regardless of the underlying atomic structures but also for hybrid organic–inorganic perovskites. With this approach, we comprehensively explore up to 15,659 materials, unveiling 14 unreported lead-free perovskites with suitable band gaps for photovoltaics. Notably, MASnBr₃, FA₂SnGeBr₆, MA₂AuAuBr₆, FA₂AuAuBr₆, FA₂InBiCl₆, FA₂InBiBr₆, and Ba₂InBiO₆ stand out with direct band gaps, small effective masses, low exciton binding energies, and high stabilities.