Citation: |
R. Singh, T. R. Lenka, R. T. Velpula, B. Jain, H. Q. T. Bui, H. P. T. Nguyen. Investigation of current collapse and recovery time due to deep level defect traps in β-Ga2O3 HEMT[J]. Journal of Semiconductors, 2020, 41(10): 102802. doi: 10.1088/1674-4926/41/10/102802
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R Singh, T R Lenka, R T Velpula, B Jain, H Q T Bui, H P T Nguyen, Investigation of current collapse and recovery time due to deep level defect traps in β-Ga2O3 HEMT[J]. J. Semicond., 2020, 41(10): 102802. doi: 10.1088/1674-4926/41/10/102802.
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Investigation of current collapse and recovery time due to deep level defect traps in β-Ga2O3 HEMT
DOI: 10.1088/1674-4926/41/10/102802
More Information
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Abstract
In this paper, drain current transient characteristics of β-Ga2O3 high electron mobility transistor (HEMT) are studied to access current collapse and recovery time due to dynamic population and de-population of deep level traps and interface traps. An approximately 10 min, and 1 h of recovery time to steady-state drain current value is measured under 1 ms of stress on the gate and drain electrodes due to iron (Fe)–doped β-Ga2O3 substrate and germanium (Ge)–doped β-Ga2O3 epitaxial layer respectively. On-state current lag is more severe due to widely reported defect trap EC – 0.82 eV over EC – 0.78 eV, −0.75 eV present in Iron (Fe)-doped β-Ga2O3 bulk crystals. A negligible amount of current degradation is observed in the latter case due to the trap level at EC – 0.98 eV. It is found that occupancy of ionized trap density varied mostly under the gate and gate–source area. This investigation of reversible current collapse phenomenon and assessment of recovery time in β-Ga2O3 HEMT is carried out through 2D device simulations using appropriate velocity and charge transport models. This work can further help in the proper characterization of β-Ga2O3 devices to understand temporary and permanent device degradation.-
Keywords:
- β-Ga2O3,
- current collapse,
- degradation,
- HEMT,
- recovery time,
- traps,
- trapping effects
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References
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