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Study of Ti contacts to corundum α -Ga 2 O 3
- Source :
- Journal of physics / D 54(38), 384001-(2021). doi:10.1088/1361-6463/ac0d28, Journal of Physics D: Applied Physics
- Publication Year :
- 2021
- Publisher :
- IOP Publishing, 2021.
-
Abstract
- We present a study of the electrical, structural and chemical properties of Ti contacts on atomic layer deposited α-Ga2O3 film. Ti forms an ohmic contact with α-Ga2O3. The contact performance is highly dependent on the post-evaporation annealing temperature, where an improved conductivity is obtained when annealing at 450 °C, and a strong degradation when annealing at higher temperatures. Structural and chemical characterisation by transmission electron microscopy techniques reveal that the electrical improvement or degradation of the contact upon annealing can be attributed to oxidation of the Ti metallic layer by the Ga2O3 film in combination with the possibility for Ti diffusion into the Au layer. The results highlight that the grain boundaries and inclusions in the Ga2O3 film provide fast diffusion pathways for this reaction, leaving the α-Ga2O3 crystallites relatively unaffected—this result differs from previous reports conducted on β-Ga2O3. This study underlines the necessity for a phase-specific and growth method-specific study of contacts on Ga2O3 devices.
- Subjects :
- Paper
Acoustics and Ultrasonics
corundum
Annealing (metallurgy)
oxidation
Corundum
02 engineering and technology
engineering.material
Conductivity
01 natural sciences
metal contact
gallium oxide
0103 physical sciences
ddc:530
Ohmic contact
QC
Emerging Leaders 2021
010302 applied physics
diffusion
021001 nanoscience & nanotechnology
Condensed Matter Physics
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Chemical engineering
Transmission electron microscopy
engineering
Grain boundary
annealing
Crystallite
0210 nano-technology
Layer (electronics)
Subjects
Details
- ISSN :
- 00223727
- Database :
- OpenAIRE
- Journal :
- Journal of physics / D 54(38), 384001-(2021). doi:10.1088/1361-6463/ac0d28, Journal of Physics D: Applied Physics
- Accession number :
- edsair.doi.dedup.....0877029fa52e49c6233ea27688965996