Enhanced high-electron-mobility transistor based on ferroelectric group III nitride polarization reversion

Abstract

;An enhanced high-electron-mobility transistor based on ferroelectric III nitride polarization reversion comprises a substrate, a nucleating layer, a buffer layer, an insertion layer, a barrier layer and a passivation layer in sequence from bottom to top and the barrier layer comprises a non-ferroelectric barrier layer and a ferroelectric group III nitride barrier layer, and the ferroelectric group III nitride barrier layer is arranged between the non-ferroelectric barrier layer and the passivation layer. The buffer layer and the barrier layer form heterojunctions with different forbidden band widths, and the forbidden band width of the buffer layer is smaller than the forbidden band width of the barrier layer; two ends of the upper surface of the buffer layer are provided with a source electrode and a drain electrode; and a gate electrode is arranged on the ferroelectric III nitride barrier layer, and the gate electrode is nested in the passivation layer. The buffer layer and the barrier layer are made of III-V group semiconductor materials, the preparation processes of the buffer layer and the barrier layer are compatible, the film growth quality of each layer is high, and the interface characteristic between the films is good; and meanwhile, the ferroelectric hysteresis loop rectangularity of the group III nitride ferroelectric material is high, the remanent polarization intensity is high, the retention time of the closed and on states of the device is long, and the service reliability is higher.

Description

technical field [0001] The invention belongs to the field of semiconductor devices, and relates to a class of enhanced high electron mobility transistor devices that utilize the polarization reversal characteristics of ferroelectric Group III nitrides to realize the off state under zero bias voltage of the gate, and can modulate the conduction of the device at the same time. The concentration of the two-dimensional electron gas in the heterojunction interface channel in the state. Background technique [0002] The group III nitride wide bandgap semiconductor material system, including GaN, AlN, BN and their multi-component alloys, is a new type of semiconductor material that has received great attention in recent years. Compared with the first-generation and second-generation semiconductor materials such as silicon, germanium and gallium arsenide, group III nitride semiconductor materials have excellent properties such as high critical breakdown electric field strength, high...

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Problems solved by technology

2DEG can move freely in the two-dimensional space parallel to the heterojunction interface, but it will be strictly restricted in the third dimension, which will lead to the movement of the quantized energy level in the third direction. Therefore, it has excellent electrical properties and has been studied people's attention

However, for a long time, it was believed that the spontaneous polarization of this type of material cannot be reversed by an external electric field, so it does not have ferroelectric properties.

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