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Room-Temperature-Synthesized High-Mobility Transparent Amorphous CdO-Ga2O3 Alloys with Widely Tunable Electronic
Chao Ping Liu1, Chun Yuen Ho1, Roberto Dos Reis2
1Department of Physics, City University of Hong Kong , 83 Tat Chee Avenue, Kowloon 999077, Hong Kong.
ACS Applied Materials & Interfaces
|February 2, 2018
Summary
This study synthesized cadmium gallium oxide (Cd1-xGaxO1+δ) alloy thin films. Amorphous alloys show tunable optoelectronic properties, making them suitable for transparent conductors and thin-film transistors.
Area of Science:
- Materials Science
- Thin Film Technology
- Semiconductor Physics
Background:
- Development of novel transparent conductive materials is crucial for next-generation electronics.
- Tuning optoelectronic properties of oxide alloys offers a pathway to advanced device applications.
Purpose of the Study:
- To synthesize Cd1-xGaxO1+δ alloy thin films across the entire composition range.
- To investigate the structural, electrical, and optical properties of these alloys.
- To explore their potential applications as transparent conductors and in thin-film transistors.
Main Methods:
- Radio frequency magnetron sputtering at room temperature.
- Compositional variation (0 ≤ x ≤ 1) of Cd1-xGaxO1+δ.
- Characterization of structural (amorphous/crystalline), electrical (resistivity, mobility), and optical (band gap) properties.
Main Results:
- Amorphous Cd1-xGaxO1+δ films (x > 0.3) exhibit high electron mobility (10–20 cm2 V-1 s-1) and tunable resistivity over 5 orders of magnitude.
- A wide tunable intrinsic band gap range (2.2–4.8 eV) and conduction band minimum (5.8–4.5 eV below vacuum) were observed.
- Amorphous alloys with 0.3 < x < 0.4 show promise as transparent conductors on flexible substrates.
Conclusions:
- Amorphous Cd1-xGaxO1+δ alloys possess favorable optoelectronic properties for transparent conductor applications.
- Tunable band edges and conductivity make these materials suitable for transparent thin-film transistors and electron transport layers.
- Room-temperature synthesis offers a cost-effective route for producing these functional oxide alloys.
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