Self-assembled passivation layer for high performance perovskite solar cells

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K14774
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21050:Electric and electronic materials-related
• Research Institution: Saitama University
• Principal Investigator: Ryo Ishikawa 埼玉大学, 理工学研究科, 助教 (90708778)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: ペロブスカイト太陽電池 / 自己組織化 / フッ素系物質 / 表面偏析 / パッシベーション / 薄膜

Outline of Final Research Achievements

In perovskite solar cells, the quality of the film is essential, but the passivation of the surface and interface is necessary not only for high performance but also for high durability. Passivation by post-treatment is very useful, but its drawback is that it increases the number and time of processes.
When fluorinated polymers and fluorophosphoric acid are added to perovskite precursors, the fluorinated polymers and fluorophosphoric acid self-segregate on the surface of the perovskite thin film within a few to ten nm during film formation, as determined by depth analysis of X-ray photoelectron spectroscopy. The self-segregated fluorophosphorous materials served as a passivation layer, and a maximum photostabilized output of 20.4% was obtained without any post-treatment.

Free Research Field

電子材料

Academic Significance and Societal Importance of the Research Achievements

ペロブスカイト太陽電池においてフッ素系物質の添加については耐久性向上の観点からいくつかの報告例があるが、その低い表面自由エネルギーによる表面偏析に関しては調査されていなかった。本研究では添加したフッ素系物質がペロブスカイト薄膜表面に自己偏析しており、かつ自己偏析層がパッシベーションとして機能することを示し、後処理を行わず高速にペロブスカイト太陽電池を成膜する方法として有用であることを示した。