Surface modification and characterization of electrosprayed Sn-doped In2O3 thin films

Area of Science:

• Materials Science
• Thin Film Technology
• Semiconductor Physics

Background:

• Indium tin oxide (ITO) is a crucial transparent conductive oxide.
• Developing efficient synthesis methods for high-performance ITO thin films is essential for electronic applications.
• Surface modification and controlled heat treatment are key to optimizing ITO properties.

Purpose of the Study:

• To synthesize and characterize Sn-doped In2O3 (ITO) thin films using a combined electrospray and spin-coating technique.
• To investigate the impact of surface modification and microwave heat treatment on ITO film properties.
• To determine the optimal heat treatment temperature for achieving superior electrical and optical performance.

Main Methods:

• Synthesis of ITO thin films via electrospray and spin-coating with sol-layer surface modification.
• Microwave heat treatment of modified ITO films at 450°C, 550°C, 650°C, and 750°C.
• Characterization using scanning electron microscopy, atomic force spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Hall-effect measurements, and UV-vis spectrophotometry.

Main Results:

• Surface-modified ITO thin films treated at 550°C exhibited optimal performance.
• The optimized films showed a resistivity of 9.9 x 10⁻³ Ω·cm and optical transmittance of 92.08%.
• Improved densification from spin-coating and uniform film formation from electrospraying contributed to the superior properties.

Conclusions:

• The combined electrospray and spin-coating method, coupled with appropriate heat treatment, effectively produces high-performance ITO thin films.
• Surface modification and controlled microwave heating are critical parameters for optimizing ITO properties.
• The study demonstrates a viable route for fabricating advanced ITO thin films for various optoelectronic applications.