Comparison between The ultra-wide band gap semiconductor AlGaN and GaN

Low resistance ohmic contacts on wide band-gap GaN

We report a new metallization process for achieving low resistance ohmic contacts to molecular beam epitaxy grown n-GaN (--Or7 cme3) using an Ah% bilayer metallization scheme. Four different thin-film contact metallizations were compared during the investigation, including Au, Al, Ti/Au, and Ti/Al layers. The metals were first deposited via conventional electron-beam evaporation onto the GaN su...

Wide Band Gap Semiconductor Devices for Power Electronics

It is worldwide accepted today that a real breakthrough in the Power Electronics field may mainly come from the development and use of Wide Band Gap (WBG) semiconductor devices. WBG semiconductors such as SiC, GaN, and diamond show superior material properties, which allow operation at high-switching speed, high-voltage and high-temperature. These unique performances provide a qualitative chang...

Si3N4/AlGaN/GaN-Metal-Insulator-Semiconductor Heterostructure Field-Effect Transistors

Design of X Band High Power Amplifier MMIC Based on AlGaN/GaN HEMT

In this paper, we have presented an X band high power amplifier based on MMIC (Monolithic Microwave Integrated Circuit) technology for satellite remote sensing systems. We have used GaN HEMT process with 500 nm gate length technology with VD= 40 V and VG= -2 V in class E structure. The proposed two-stage power amplifier provides 25 dB power gain with maximum output power of 49.3 dBm at 10 GHz. ...

Determination of energy-band offsets between GaN and AlN using excitonic luminescence transition in AlGaN alloys

We report the determination of the energy-band offsets between GaN and AlN using the linewidth full width at half maximum of an extremely sharp excitonic luminescence transition in AlxGa1−xN alloy with x=0.18 at 10 K. Our sample was grown on C-plane sapphire substrate by metal-organic chemical-vapor deposition at 1050 °C. The observed value of the excitonic linewidth of 17 meV is the smallest e...