摘要
Two-dimensional Dion–Jacobson(D-J)phase perovskites are prospective photovoltaic and optoelectronic materials.To study their mechanical properties and carrier-lattice interactions,we conduct femtosecond spectroscopic experiments on the films of a D-J perovskite.After optical excitation,a∼33 meV bandgap oscillation is observed in the film by transient absorption spectroscopy.With the help of transient reflection methods,we reveal that the oscillation originates from the transport of coherent longitudinal acoustic phonons through the film.Large bandgap oscillation indicates a strong coupling between carriers and lattice,and significant bandgap modulation by strains in D-J perovskites.
作者
孙逢柯
吴博宁
金盛烨
Fengke Sun;Boning Wu;Shengye Jin(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China)
基金
supported by the Ministry of Science and Technology(No.2018YFA0208704)
the National Natural Science Foundation of China(No.22173096).