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Nanopatterning Induced Si Doping in Amorphous Ga2O3 for Enhanced Electrical Properties and Ultra-Fast Photodetection
Damanpreet Kaur1, Rakhi2, Raghvendra Posti3
1Functional and Renewable Energy Materials Laboratory, Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab, 140001, India.
Small (Weinheim an Der Bergstrasse, Germany)
|April 15, 2024
Summary
This study introduces a novel, low-temperature method to enhance the electrical conductivity of amorphous gallium oxide (Ga2O3) films using silicon doping. The technique improves carrier conduction and light management for flexible electronics.
Area of Science:
- Materials Science
- Semiconductor Physics
- Nanotechnology
Background:
- Amorphous Gallium Oxide (Ga2O3) is a key material for next-generation electronics due to its wide-bandgap properties.
- High resistivity limits the application of amorphous Ga2O3 in flexible electronics.
- Conventional doping methods require high temperatures, restricting their use with amorphous Ga2O3.
Purpose of the Study:
- To develop an unconventional, low-temperature doping method for amorphous Ga2O3 films.
- To enhance the electrical properties and light management capabilities of amorphous Ga2O3.
- To demonstrate the efficacy of this method in fabricating high-performance metal-semiconductor-metal (MSM) photoconductor devices.
Main Methods:
- Utilized ion-beam sputtering to nanopattern SiO2-coated Si substrates, creating a silicon-rich surface.
- Coated the nanopatterned substrates with 5 nm amorphous Ga2O3 films.
- Fabricated and characterized metal-semiconductor-metal (MSM) photoconductor devices on doped and non-doped films.
Main Results:
- Silicon doping significantly increased n-type conductivity, confirmed by resistivity measurements and valence band spectra.
- Nanopatterning improved light management properties.
- MSM photoconductors on doped, rippled films exhibited a substantial increase in responsivity (6 to 433 mA W-1) and faster response times (861 µs rise/710 µs fall) compared to non-rippled devices.
Conclusions:
- A facile, cost-effective, and large-area bottom-up method for doping amorphous Ga2O3 was demonstrated.
- The developed technique enhances electrical conductivity and optical properties of amorphous Ga2O3 films.
- This approach holds potential for improving other amorphous oxide semiconductors for advanced electronic applications.
