Patent ID: 8080182

Claim:
An oxide film, which is obtained by a sputtering method by using an oxide sintered body which comprises gallium, indium, and oxygen, with a content of the gallium being more than 65 at. % and less than 100 at. % with respect to all metallic elements, the oxide sintered body having one or more phases selected from a gallium oxide phase having β-Ga 2 O 3 type structure (β-Ga 2 O 3 phase), a gallium indium oxide phase having β-Ga 2 O 2 type structure (β-Ga 2 InO 3 phase) or (Ga,In) 2 O 3 phase, the oxide sintered body having an indium oxide phase (In 2 O 3 phase) of the bixbyite-type structure, and wherein a ratio in which the indium oxide phase (In 2 O 3 phase) of the bixbyite-type structure contained is 5% or less in terms of an X-ray diffraction peak intensity ratio defined by the following formula (1), and which has a density being 5.0 g/cm 3 or more, as a sputtering target, wherein the oxide film comprises gallium, indium and oxygen, with a content of the gallium being more than 65 at. % and less than 100 at. % with respect to all metallic elements, and a shortest wavelength at which light transmittance of the film itself, excluding a substrate, becomes 50% is 320 nm or less: In 2 O 3 phase (400)/{β-Ga 2 O 3 phase (−202)+β-GaInO 3 phase (111)+(Ga,In) 2 O 3 phase (2θ=33°)}×100[%] (1).