β-Ga2O3 MOSFETs electrical characteristic study of various etching depths grown on sapphire substrate by MOCVD

Chan Hung Lu, Fu Gow Tarntair, Yu Cheng Kao, Niall Tumilty, Jia Min Shieh, Shao Hui Hsu, Ching Lien Hsiao, Ray-Hua Horng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

β-Ga2O3 thin films with both a 45 nm Si-doped conductive epilayer and unintentionally doped epilayer were grown on c-plane sapphire substrate by metalorganic chemical vapor deposition. β-Ga2O3 based metal–oxide–semiconductor field-effect transistors (MOSFETs) were fabricated with gate recess depths of 20 nm and 40 nm (it indicated gate depth with 70 nm and 50 nm, respective), respectively, and without said recessing process. The conductivity of β-Ga2O3 epilayers was improved through low in situ doping using a tetraethoxysilane precursor to increase MOSFET forward current density. After recessing, MOSFET operation was transferred from depletion to enhanced mode. In this study, the maximum breakdown voltage of the recessed 40 nm transistor was 770 V. The etching depth of a recessed-gate device demonstrates its influence on device electrical performance.

Original languageEnglish
Article number92
JournalDiscover Nano
Volume18
Issue number1
DOIs
StatePublished - Dec 2023

Keywords

  • Enhancement mode
  • High power MOSFETs
  • MOCVD
  • Recessed gate
  • β-GaO

Fingerprint

Dive into the research topics of 'β-Ga2O3 MOSFETs electrical characteristic study of various etching depths grown on sapphire substrate by MOCVD'. Together they form a unique fingerprint.

Cite this