Wilson D P, Sokolovskii A S, LaPierre R R, Panciera F, Glas F, Dubrovskii V G
Department of Engineering Physics, Centre for Emerging Device Technologies, McMaster University, Hamilton ON L8S 4L7, Canada. ITMO University, Kronverkskiy pr. 49, 197101, St. Petersburg, Russia.
Nanotechnology. 2020 Nov 27;31(48):485602. doi: 10.1088/1361-6528/abb106.
The droplet contact angle and morphology of the growth interface (vertical, tapered or truncated facets) are known to affect the zincblende (ZB) or wurtzite (WZ) crystal phase of III-V nanowires (NWs) grown by the vapor-liquid-solid method. Here, we present a model which describes the dynamics of the morphological evolution in self-catalyzed III-V NWs in terms of the time-dependent (or length-dependent) contact angle or top nanowire radius under varying material fluxes. The model fits quite well the contact angle dynamics obtained by in situ growth monitoring of self-catalyzed GaAs NWs in a transmission electron microscope. These results can be used for modeling the interface dynamics and the related crystal phase switching and for obtaining ZB-WZ heterostructures in III-V.
已知通过气-液-固方法生长的III-V族纳米线（NWs）的液滴接触角和生长界面的形态（垂直、锥形或截顶小面）会影响其闪锌矿（ZB）或纤锌矿（WZ）晶体相。在此，我们提出了一个模型，该模型根据在不同材料通量下随时间变化（或随长度变化）的接触角或顶部纳米线半径，描述了自催化III-V族NWs中形态演变的动力学。该模型与通过透射电子显微镜对自催化GaAs NWs进行原位生长监测获得的接触角动力学拟合得非常好。这些结果可用于对界面动力学和相关晶体相转换进行建模，以及在III-V族中获得ZB-WZ异质结构。
