Large bandgap oscillations in two-dimensional Dion–Jacobson phase perovskites caused by coherent longitudinal acoustic phonons [Invited]

作     者：Fengke Sun Boning Wu Shengye Jin 孙逢柯;吴博宁;金盛烨

作者机构：Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2022年第20卷第10期

页      面：55-59页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Ministry of Science and Technology(No.2018YFA0208704) the National Natural Science Foundation of China(No.22173096) 

主　　题：transient absorption coherent longitudinal acoustic phonons bandgap oscillation 2D Dion-Jacobson phase perovskites 

摘      要：Two-dimensional Dion–Jacobson(D-J)phase perovskites are prospective photovoltaic and optoelectronic *** study their mechanical properties and carrier-lattice interactions,we conduct femtosecond spectroscopic experiments on the films of a D-J *** optical excitation,a∼33 meV bandgap oscillation is observed in the film by transient absorption *** the help of transient reflection methods,we reveal that the oscillation originates from the transport of coherent longitudinal acoustic phonons through the *** bandgap oscillation indicates a strong coupling between carriers and lattice,and significant bandgap modulation by strains in D-J perovskites.