材料科学
钙钛矿(结构)
六角相
相(物质)
带隙
卤化物
光致发光
吸收(声学)
相变
吸收光谱法
六方晶系
波长
分析化学(期刊)
结晶学
光学
光电子学
无机化学
凝聚态物理
化学
有机化学
物理
复合材料
作者
Jeong Bin Cho,Dae Young Park,Kyeong‐Hyeon Lee,Sung-Do Kim,Yong Soo Kim,Mun Seok Jeong,Joon I. Jang
标识
DOI:10.1002/adom.202301824
摘要
Abstract Recently, mixed‐cation halide perovskites have gained significant attention for developing stable, high‐performance solar cells. However, their nonlinear optical (NLO) properties are much less explored. Herein, this study reports on intriguing NLO properties observed from FA 0.8 MA 0.2 PbI 3 single crystals, having an ideal bandgap of 1.52 eV for photovoltaic performance. Contrary to a simple prediction, the perovskite exhibits higher‐order multiphoton absorption (MPA) over a broad wavelength range from 1300 to 1710 nm as evidenced by wavelength‐ and intensity‐dependent photoluminescence measurements. The corresponding MPA coefficients are very large to dominate lower‐order ordinary MPA across the bandgap. The hexagonal phase present in the perovskite is responsible for the observed higher‐order transition as confirmed by the recovery of ordinary MPA in the absence of the hexagonal phase. Although the perovskite is known to crystallize into the cubic phase at room temperature, these results indicate that minor inclusion of the hexagonal phase (≈4.0% at room temperature) can drastically alter the nature of the multiphoton process by double resonance uniquely offered by the mixed phases.
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