The invention discloses an Al2O3 / AlN / GaN / AlGaN / GaN double-channel MOS-HEMT (
Metal Oxide Semiconductor-
High Electron Mobility
Transistor) device and a manufacturing method. The double-channel MOS-HEMT device comprises a GaN nucleating layer 9, a GaN buffer layer 8, an AlGaN lower
barrier layer 7, a GaN channel layer 6, an AlN upper
barrier layer 5, an Al2O3
gate dielectric layer 4, a source
electrode 1, a drain
electrode 3 and a gate
electrode 2, wherein the GaN nucleating layer 9, the GaN buffer layer 8, the AlGaN lower
barrier layer 7, the GaN channel layer 6 and the AlN upper barrier layer 5 are formed on a
sapphire substrate 10 in sequence, the Al2O3
gate dielectric layer 4, the source electrode 1 and thea drain electrode 3 are formed on the AlN upper barrier layer 5, and the gate electrode 2 is formed on the Al2O3
gate dielectric layer 4. The invention is characterized in that an AlN material with good heat
conductivity and greater forbidden
band width is used as the upper barrier layer, so that the
self heating effect of the device is reduced, and the
threshold voltage of the device in a depletion mode is reduced; a depth
potential well made from AlN and GaN is used for suppressing the
hot electron effect under
high voltage, so that the current collapse effect of the device is reduced; the strong polarization feature of the AlN material is used to increase the
electron concentration in the channel and increase the
saturation current and the output power of the device; and the Al2O3 material deposited by using the
atomic layer deposition process is used as the gate
dielectric layer, so that the leakage current of the gate electrode is reduced, and the
breakdown voltage of the device is increased.