1.26 W/mm Output Power Density at 10 GHz for Si3N4Passivated H-Terminated Diamond MOSFETs
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2021-08-27 |
| Journal | IEEE Transactions on Electron Devices |
| Authors | Xinxin Yu, Wenxiao Hu, Jianjun Zhou, Yun Wu, Ran Tao |
| Institutions | Nanjing University, Nanjing Institute of Technology |
| Citations | 11 |
Abstract
Section titled “Abstract”In this article, the hydrogen-terminated diamond metal-oxide-semiconductor field effect transistors (MOSFETs) which can operate at high frequency of 10 GHz are demonstrated. The devices were fabricated with a 50 nm Al <sub xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”>2</sub> O <sub xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”>3</sub> gate insulator and a 350 nm Si <sub xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”>3</sub> N <sub xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”>4</sub> passivation layer, which is compatible with the process of monolithic microwave-integrated circuits (MMICs). The device with gate length of 0.35 <inline-formula xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”> <tex-math notation=“LaTeX”>$\mu \text{m}$ </tex-math></inline-formula> shows a high drain current density of −561 mA/mm. The RF small signal characteristics and power output performances at 10 GHz for the devices with different gate widths have been investigated. With the gate width increased from 100 to 200 <inline-formula xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”> <tex-math notation=“LaTeX”>$\mu \text{m}$ </tex-math></inline-formula> , the extrinsic maximum frequency of oscillation <inline-formula xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”> <tex-math notation=“LaTeX”>${f} _{\text {max}}$ </tex-math></inline-formula> is slightly decreased from 23 to 21 GHz, whereas the output power density at 10 GHz is improved from 1.05 to 1.26 W/mm, with associated power added efficiency increased from less than 5% to 20.77%. Comparing with the devices fabricated by the self-aligned gate process, the power output performance is significantly improved, indicating it is a promising method to fabricate high power and high frequency diamond MOSFETs by using the thick Si <sub xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”>3</sub> N <sub xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”>4</sub> passivation technique.