title: Femtosecond laser-irradiated crystallization of amorphous Si2Sb2Te3 films and its in-situ characterization by coherent phonon spectroscopy.
abstract: Femtosecond laser-irradiation-induced phase change of a new amorphous Si(2)Sb(2)Te(3) film with a good thermal stability and low reset current is studied by coherent phonon spectroscopy. New coherent optical phonons (COP) occur as laser irradiation fluence reaches some threshold, implying laser-induced phase change emerged. The compositions in phase-changed area revealed by COP modes agree well with ones in reported annealed crystallized film, implying laser-induced phase change as crystallization. Pump fluence dependence of COP dynamics reveals good crystallization quality of the phase-changed film, exhibiting promising application of Si(2)Sb(2)Te(3) films in optical phase change memory. Acoustic phonons are also found and identified.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technology, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
authors.forename: Simian
authors.initials: S
authors.lastname: Li
authors.forename: Dong
authors.initials: D
authors.lastname: Zhou
authors.forename: Ting
authors.initials: T
authors.lastname: Wen
authors.forename: Weilin
authors.initials: W
authors.lastname: Zhu
authors.forename: Zhitang
authors.initials: Z
authors.lastname: Song
authors.forename: Tianshu
authors.initials: T
authors.lastname: Lai
mesh_terms: D003460:Crystallization / Q000379:methods*; D007834:Lasers; D008422:Materials Testing; D008567:Membranes, Artificial; D017785:Photons; D012825:Silicon / Q000737:chemistry* / Q000528:radiation effects*; D013057:Spectrum Analysis / Q000379:methods*
chemical_list: D008567:Membranes, Artificial; D012825:Silicon