Morphological studies of SnO2 thin films fabricated by using e-beam method

Area of Science:

• Materials Science
• Nanotechnology
• Thin Film Deposition

Background:

• Tin(IV) oxide (SnO2) is a semiconductor with diverse applications.
• Controlling the morphology of SnO2 nanostructures is crucial for optimizing their properties.
• Electron beam evaporation is a versatile technique for thin film deposition.

Purpose of the Study:

• To investigate the influence of substrate temperature, oxygen partial pressure, and film thickness on SnO2 nanostructure morphology.
• To optimize electron beam evaporation conditions for producing crystalline SnO2 nanosheets.
• To understand the growth mechanism of SnO2 nanosheets.

Main Methods:

• Deposition of SnO2 thin films using electron beam evaporation on quartz substrates.
• Variation of substrate temperatures (RT to 300°C) and oxygen partial pressures (0-200 sccm).
• Characterization using X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), and Energy Dispersive Spectroscopy (EDS).

Main Results:

• Amorphous SnO2 films at RT and 100°C; crystalline films with rutile structure at 200°C and 300°C.
• Increased crystallinity with higher oxygen partial pressure.
• Sheet-like morphology (40 nm thickness, 1 µm lateral dimension) observed at 200°C and 300°C, with size increasing with temperature and oxygen pressure.

Conclusions:

• Substrate temperature and oxygen partial pressure significantly control SnO2 thin film morphology and crystallinity.
• Crystalline SnO2 nanosheets can be effectively produced via optimized electron beam evaporation.
• The findings provide insights into the growth mechanism of SnO2 nanosheets for potential applications.