飞秒
激子
材料科学
钙钛矿(结构)
激光器
超短脉冲
光电子学
纳米晶
带隙
纳米技术
光学
凝聚态物理
化学
结晶学
物理
作者
Chunpeng Song,Huanrui Yang,Feng Liu,Gary J. Cheng
标识
DOI:10.1038/s41467-021-25140-2
摘要
Abstract The carriers’ transportation between layers of two-dimensional (2D) perovskites is inhibited by dielectric confinement. Here, for the first time, we employ a femtosecond laser to introduce ultrafast shock pressure in the range of 0~15.45 GPa to reduce dielectric confinement by modulating the structure and exciton dynamics in a perovskite single crystal (PSCs), e.g. (F-PEA) 2 PbI 4 (4-fluorophenethylammonium, F-PEA). The density functional theory (DFT) simulation and experimental results show that the inorganic framework distortion results in a bandgap reduction. It was found that the exciton-optical phonon coupling and free excitons (FEs) binding energy are minimized at 2.75 GPa shock pressure due to a reduction in dielectric confinement. The stability testing under various harsh light and humid thermal conditions shows that femtosecond laser shocking improves the stability of (F-PEA)2PbI4 PSCs. Femtosecond laser shock processing provides a new approach for regulating the structure and enhancing halide perovskite properties.
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