Electrical and Optical Properties of In₂O₃ Thin Films Deposited on Sapphire Substrate

Area of Science:

• Materials Science
• Solid State Physics
• Thin Film Technology

Background:

• Indium oxide (In2O3) is a promising n-type semiconductor with diverse applications.
• Understanding the relationship between growth parameters and film properties is crucial for optimizing In2O3-based devices.

Purpose of the Study:

• To investigate the effects of growth temperature and oxygen pressure on the structural and electrical properties of In2O3 thin films.
• To elucidate the mechanisms behind optical shifts in In2O3 thin films.

Main Methods:

• Preparation of In2O3 thin films using laser molecular beam epitaxy on c-plane sapphire substrates.
• Structural characterization using X-ray diffraction (XRD).
• Analysis of electrical and optical properties.

Main Results:

• Highly (111)-oriented In2O3 films were achieved.
• Growth temperature and oxygen pressure were found to control (222) peak intensity, crystallite size, carrier concentration, and resistivity.
• Optical shifts were explained by defect energy levels and the Burstein-Moss band-filling effect.

Conclusions:

• Growth parameters critically influence the quality and properties of In2O3 thin films.
• The findings provide insights into tailoring In2O3 films for specific electronic and optical applications.