Growth temperature dependences of structural and electrical properties of Ga2O3 epitaxial films grown on β-Ga2O3 (010) substrates by molecular beam epitaxy

Publication date: 15 April 2014
Source:Journal of Crystal Growth, Volume 392
Author(s): Kohei Sasaki , Masataka Higashiwaki , Akito Kuramata , Takekazu Masui , Shigenobu Yamakoshi
We investigated the growth temperature dependence of the structural and electrical properties of Sn-doped Ga2O3 homoepitaxial films grown on single-crystal β-Ga2O3 (010) substrates by molecular beam epitaxy. Ga2O3 films with an atomically smooth surface were obtained at growth temperatures of 550–650°C. On the other hand, a delay in the incorporation of Sn atoms in Ga2O3, which was probably due to segregation, occurred in the initial stage of growth at higher than 600°C. To ensure that Sn-doped Ga2O3 films with both high crystal quality and accurately controlled carrier density are obtained, the optimum growth temperature should be set at 540–570°C.