Formation of β-Ga2O3 nanofibers of sub-50nm diameter synthesized by electrospinning method

Publication date: 1 January 2018
Source:Thin Solid Films, Volume 645
Author(s): Youngbin Yoon, Kook In Han, Baek Hyun Kim, In Gyu Lee, Younghun Kim, Jong Pil Kim, Wan Sik Hwang
β-Ga2O3 nanofibers of sub-50nm diameter are formed using a GaCl3, polyvinylpyrrolidone, and deionized water solution via an electrospinning method. The as-electrospun amorphous nanofibers turn into polycrystalline nanofibers of monoclinic phase after annealing at 900°C for 6h. Material properties of the nanofibers are investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. In addition, the nanofibers' optical bandgap is measured via the direct-bandgap model. Unlike the conventional ethanol-contained solvent and Ga(NO3)3, the ethanol-free solvent and GaCl3 led to sub 50-nm diameter Ga2O3 nanofiber that could be applied to power devices (rather than a conventional 3-dimentioinal β-Ga2O3 substrate) to effectively remove the heat generated during device operation.