2024-11-21 ノースウェスタン大学
＜関連情報＞
- https://news.northwestern.edu/stories/2024/11/stability-of-perovskite-solar-cells-doubled-with-protective-coating/
- https://www.science.org/doi/10.1126/science.adr2091
- https://tiisys.com/blog/2022/11/17/post-113613/
化学・電界効果パッシベーション用配位子のアミド化によりペロブスカイト太陽電池が安定化 Amidination of ligands for chemical and field-effect passivation stabilizes perovskite solar cells
Yi Yang, Hao Chen, Cheng Liu, Jian Xu, […], and Edward H. Sargent
Science Published:21 Nov 2024
DOI:https://doi.org/10.1126/science.adr2091
Editor’s summary
Perovskite passivation ligands with amidinium head groups instead of the more common ammonium group are less prone to deprotonation and show improved stability at higher temperatures. Yang et al. combined diamidinium- and fluorobenzene-based amidinium molecules to suppress several charge-carrier recombination pathways at the interface of the perovskite and the electron-transfer layer. Inverted solar cells exhibited a power conversion efficiency of 26.3% and retained 90% or more of that efficiency for 1100 hours of maximum power point operation at 85°C. —Phil Szuromi
Abstract
Surface passivation has driven the rapid increase in the power conversion efficiency (PCE) of perovskite solar cells (PSCs). However, state-of-the-art surface passivation techniques rely on ammonium ligands that suffer deprotonation under light and thermal stress. We developed a library of amidinium ligands, of interest for their resonance effect–enhanced N–H bonds that may resist deprotonation, to increase the thermal stability of passivation layers on perovskite surfaces. This strategy resulted in a >10-fold reduction in the ligand deprotonation equilibrium constant and a twofold increase in the maintenance of photoluminescence quantum yield after aging at 85°C under illumination in air. Implementing this approach, we achieved a certified quasi–steady-state PCE of 26.3% for inverted PSCs; and we report retention of ≥90% PCE after 1100 hours of continuous 1-sun maximum power point operation at 85°C.
