Surface-directed ZnGa2O4 and β-Ga2O3 nanofins coated with a non-polar GaN shell based on the Kirkendall effect
Aaron Johnston-Peck, Babak Nikoobakht
We present a novel approach for growth of surface-directed spinel Ga2O3 nanofins coated with non-polar GaN shell. Our results show that use of a binary compound such as core-shell nanostructures as a starting material is not necessary to promote the Kirkendall effect, therefore the presented growth method simplifies the growth of wide bandgap spinel compounds. We start with surface-directed ZnO fins with non-polar side walls that provide a spatial confinement to the Kirkendall effect in which the Wurtzite fin is converted to a cubic spinel, followed by GaN shell overgrowth. The shell is not contaminated by the core reactions and out-diffusion of Zn atoms. Within the spinel fins, we observe uniform Kirkendall nanochannels that are laterally formed between its side walls. This methods offers the opportunity of integrating a broad range of wide bandgap spinel materials to GaN. Predictability over surface registries of the core/shell fins and their tunable porosity are anticipated to be of significance in a broad range of applications in chemical- and electro-optical based sensing as well as high power electronics.
and Nikoobakht, B.
Surface-directed ZnGa2O4 and β-Ga2O3 nanofins coated with a non-polar GaN shell based on the Kirkendall effect, CrystEngComm, [online], https://doi.org/10.1039/D1CE00744K, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932491
(Accessed December 9, 2023)