AlGaN/GaN high electron mobility transistors with intentionally doped GaN buffer using propane as carbon precursor

作者：Bergsten Johan; Li Xun; Nilsson Daniel; Danielsson Orjan; Pedersen Henrik; Janzen Erik; For**erg Urban; Rorsman Niklas

来源：Japanese Journal of Applied Physics, 2016, 55(5): 05FK02.

DOI：10.7567/JJAP.55.05FK02

AlGaN/GaN high electron mobility transistors (HEMTs) fabricated on a heterostructure grown by metalorganic chemical vapor deposition using an alternative method of carbon (C) doping the buffer are characterized. C-doping is achieved by using propane as precursor, as compared to tuning the growth process parameters to control C-incorporation from the gallium precursor. This approach allows for optimization of the GaN growth conditions without compromising material quality to achieve semi-insulating properties. The HEMTs are evaluated in terms of isolation and dispersion. Good isolation with OFF-state currents of 2 x 10(-6)A/mu m, breakdown fields of 70V/mu m, and low drain induced barrier lowering of 0.13mV/V are found. Dispersive effects are examined using pulsed current-voltage measurements. Current collapse and knee walkout effects limit the maximum output power to 1.3W/mm. With further optimization of the C-doping profile and GaN material quality this method should offer a versatile approach to decrease dispersive effects in GaN HEMTs.

• 出版日期2016-5