Characteristics of Y2O3-doped indium zinc oxide films grown by radio frequency magnetron co-sputtering system

• Published in: Thin solid films 2013-05, Vol.534, p.599-602
• Main Authors: Lee, Young-Jun, Kim, Joo-Hyung, Kang, Jangha
• Format: Article
• Language: English
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Deposition by sputtering; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport phenomena in thin films and low-dimensional structures; Electronics; Exact sciences and technology; Indium zinc oxide; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Physics; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Thin film transistor; Transistors; Transparent conducting oxide; Y2O3-doped indium zinc oxide
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2013.01.043

We investigate the effect of Ar/O2 gas ratio on optical, structural and electrical properties of thin yttrium-doped In–Zn–O (YIZO) film. Thin YIZO films were deposited at room temperature on glass substrates by radio frequency magnetron co-sputtering system using IZO target composed of (In2O3)1−x(ZnO)x (x=50 wt.%) and Y2O3. The measured average optical transmittance of as-grown YIZO films is over 84% in visible range. Structural analysis reveals that amorphous phase of YIZO is observed only in pure Ar gas flow condition, while crystalline peaks are found as the oxygen content in gas flow increases. Electrical resistivity of the films sharply increases with increasing Ar:O2 ratio, however its carrier concentration and mobility decreases as the O2 ratio increases. The drain-source on/off modulation from the fabricated YIZO Thin Film Transistors is over 106. ► The effect of Ar/O2 gas ratio on thin yttrium-doped In–Zn–O (YIZO) film ► The effect on optical, structural and electrical properties are investigated. ► Average optical transmittance of as-grown YIZO films is over 84% in visible range.