Optical properties of corundum-structured In2O3

Abstract

The optical properties of a single-phase corundum-structured In2O3 epilayer grown by a mist chemical vapor deposition method have been studied. Raman scattering measurements on a c face and on a lateral face reveal all of the seven Raman-active modes of the corundum structure, with good adherence to the Raman selection rules. Three out of the four infrared-active modes are observed in the spectroscopic ellipsometry measurements. The phonon frequencies obtained from Raman and ellipsometry measurements are in excellent agreement with density functional perturbation theory calculations. No trace of bixbyite phase was detected in the spectra. In the UV region, the imaginary part of the dielectric function shows two distinct onsets of strong absorption associated with direct band-to-band transitions at 3.38 and 3.86 eV.

InNi3C0.5@C-derived InNi3 alloy as a coke-resistant low-temperature catalyst for selective butadiene hydrogenation

“…In contrast, those carbon-defect related bands were not detected for A1023, and new bands at 518, 1069, and 1460 cm −1 associated with In 2 O 3 (ref. 32) and NiO (ref. 33) appeared, suggesting the complete removal of the carbon shells.…”

Determination of anisotropic optical properties of MOCVD grown m-plane α-(Al x Ga1−x )2O3 alloys

“…In 2 O 3 , despite having a stable cubic bixbyite phase (Ia3 ¯), 20) as well has a metastable corundum crystal structure. 21) This offers the opportunity of bandgap engineering over the wide range from 3.38 (α-In 2 O 3 ) 21) to 9.2 eV (α-Al 2 O 3 ). 22) It therefore covers a larger UV spectral range than the (Al x Ga 1−x )N system does (AlN E g = 5.96 eV 23) ), where already high electron mobility transistors, 24) laser diodes, 25,26) or solar-blind photodetectors 27) have been realized.…”