title: Dynamic process of phase transition from wurtzite to zinc blende structure in InAs nanowires.
abstract: In situ high-resolution transmission electron microscopy revealed the precipitation of the zinc-blende (ZB) structure InAs at the liquid/solid interface or liquid/solid/amorphous carbon triple point at high temperature. Subsequent to its precipitation, detailed analysis demonstrates unique solid to solid wurtzite (WZ) to ZB phase transition through gliding of sharp steps with Shockley partial dislocations. The most intriguing phenomenon was that each step is 6 {111} atomic layers high and the step migrated without any mechanical stress applied. We believe that this is the first direct in situ observation of WZ-ZB transition in semiconductor nanowires. A model was proposed in which three Shockley partial dislocations collectively glide on every two {0001} planes (corresponds to six atomic planes in an unit). The collective glide mechanism does not need any applied shear stress.
authors.affiliation: Department of Mechanical Engineering and Materials Science, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States.
authors.forename: He
authors.initials: H
authors.lastname: Zheng
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Jian Yu
authors.initials: JY
authors.lastname: Huang
authors.forename: Jianbo
authors.initials: J
authors.lastname: Wang
authors.forename: Ze
authors.initials: Z
authors.lastname: Zhang
authors.forename: Scott X
authors.initials: SX
authors.lastname: Mao
mesh_terms: D001152:Arsenicals / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D044367:Phase Transition; D012666:Semiconductors; D013499:Surface Properties; D015032:Zinc / Q000737:chemistry
chemical_list: D001152:Arsenicals; D007204:Indium; C076773:indium arsenide; D015032:Zinc