材料科学
钙钛矿(结构)
激子
铋
卤化物
带隙
单晶
密度泛函理论
椭圆偏振法
Crystal(编程语言)
分子物理学
凝聚态物理
光电子学
结晶学
薄膜
纳米技术
计算化学
无机化学
物理
化学
冶金
计算机科学
程序设计语言
作者
Salvatore Valastro,Stevan Gavranovic,Ioannis Deretzis,Martin Vala,Emanuele Smecca,Antonino La Magna,Alessandra Alberti,Klára Částková,Giovanni Mannino
标识
DOI:10.1002/adom.202302397
摘要
Abstract In this study, the optical behavior of lead‐free Bi‐based low‐dimensional perovskite single crystals (Cs 3 Bi 2 Cl 9 , Cs 3 Bi 2 Br 9 , Cs 3 Bi 2 I 9 , and MA 3 Bi 2 I 9 ) is investigated by spectroscopic ellipsometry, supported by X‐ray diffraction and density functional theory calculations. All materials exhibit a strong excitonic peak resulting from photogenerated electron–hole Coulomb interactions, whereas the threshold of continuous absorption is found at higher energies. The resonances of the excitonic and continuous bands, along with exciton binding energies, are extracted through Critical Point Analysis of the ellipsometric data over a wide temperature range (from −90 °C to 90 °C), revealing subtle variations in the optical characteristics for each single crystal. These materials can be applied in optoelectronics as photodetectors because of their high stability and lower toxicity compared to their Pb‐based perovskites.
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