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Annealing and measurement temperature dependence of W2B5-based rectifying contacts to n-GaN |
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| Authors: | Rohit Khanna F. Ren |
| Affiliation: | a Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA b Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA c Department of Physics, University of Florida, Gainesville, FL 32611, USA |
| Abstract: | The thermal stability and measurement temperature dependence of Schottky contact characteristics on n-GaN using a W2B5/Ti/Au metallization scheme was studied using current-voltage (I-V), scanning electron microscopy (SEM) and Auger electron spectroscopy (AES) measurements. The elemental profile obtained from samples annealed at 350 °C showed some titanium diffusion into the gold layer but little other difference from the as-deposited wafer. Annealing at 700 °C produced significant diffusion of titanium. The Schottky barrier height increased with anneal temperature up to 200 °C, reaching a maximum value of 0.65 eV, but decreased at higher annealing temperatures. The reverse breakdown voltage from diodes fabricated using the W2B5-based contacts showed a similar dependence. The reverse current magnitude was larger than predicted by thermionic emission alone. The barrier height showed only minor changes with measurement temperature up to 150 °C. |
| Keywords: | Thermal stability Temperature dependence n-GaN |
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