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- W2995431064 abstract "Because high electron mobility transistors (HEMTs) often exhibit significant gate leakage during high-temperature operation, the choice of Schottky metal is critical. Increased gate leakage and reduced ON/OFF ratio are unsuitable for the design of high-temperature electronics and integrated circuits. This paper presents high-temperature characteristics of depletion-mode molybdenum trioxide (MoO${_3}$)-gated InAlN/GaN-on-silicon HEMTs in air. After a room temperature oxidation of the Mo for 10 weeks, the leakage of the HEMT is reduced over 60 times compared to the as-deposited Mo. The use of MoO${_3}$ as the Schottky gate material enables low gate leakage, resulting in a high ON/OFF current ratio of 1.2 x 10${^8}$ at 25°C and 1.2 x 10${^5}$ at 300°C in air. At 400°C, gate control of the InAlN/GaN two-dimensional electron gas (2DEG) channel is lost and unrecoverable. Here, this permanent device failure is attributed to volatilization of the MoO${_3}$ gate due to the presence of water vapor in air. Passivation of the device with SiN enables operation up to 500°C, but also increases the leakage current. The suppression of gate leakage via Mo oxidation and resulting high ON/OFF ratio paves the way for viable high-temperature GaN-based electronics that can function beyond the thermal limit of silicon once proper passivation is achieved." @default.
- W2995431064 created "2019-12-26" @default.
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- W2995431064 date "2019-12-11" @default.
- W2995431064 modified "2023-09-26" @default.
- W2995431064 title "Molybdenum Trioxide Gates for Suppression of Leakage Current in InAlN/GaN HEMTs at 300{deg}C" @default.
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