1. A 2.8 kV Breakdown Voltage α-Ga 2 O 3 MOSFET with Hybrid Schottky Drain Contact.
- Author
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Oh SY, Jeong YJ, Kang I, Park JH, Yeom MJ, Jeon DW, and Yoo G
- Abstract
Among various polymorphic phases of gallium oxide (Ga
2 O3 ), α-phase Ga2 O3 has clear advantages such as its heteroepitaxial growth as well as wide bandgap, which is promising for use in power devices. In this work, we demonstrate α-Ga2 O3 MOSFETs with hybrid Schottky drain (HSD) contact, comprising both Ohmic and Schottky electrode regions. In comparison with conventional Ohmic drain (OD) contact, a lower on-resistance (Ron ) of 2.1 kΩ mm is achieved for variable channel lengths. Physics-based TCAD simulation is performed to validate the turn-on characteristics of the Schottky electrode region and the improved Ron . Electric-field analysis in the off-state is conducted for both the OD and HSD devices. Furthermore, a record breakdown voltage (BV) of 2.8 kV is achieved, which is superior to the 1.7 kV of the compared OD device. Our results show that the proposed HSD contact with a further optimized design can be a promising drain electrode scheme for α-Ga2 O3 power MOSFETs.- Published
- 2024
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