Atomistic Interface Dynamics in Sn-Catalyzed Growth of Wurtzite and Zinc-Blende ZnO Nanowires

Unraveling
the phase selection mechanisms of semiconductor nanowires
(NWs) is critical for the applications in future advanced nanodevices.
In this study, the atomistic vapor–solid–liquid growth
processes of Sn-catalyzed wurtzite (WZ) and zinc blende (ZB) ZnO are
directly revealed based on the in situ transmission electron microscopy.
The growth kinetics of WZ and ZB crystal phases in ZnO appear markedly
different in terms of the NW–droplet interface, whereas the
nucleation site as determined by the contact angle ϕ between
the seed particle and the NW is found to be crucial for tuning the
NW structure through combined experimental and theoretical investigations.
These results offer an atomic-scale view into the dynamic growth process
of ZnO NW, which has implications for the phase-controllable synthesis
of II–VI compounds and heterostructures with tunable band structures.