Non-thermal alloyed ohmic contact process of GaN-based HEMTs by pulsed laser annealing

An Jye Tzou, Dan Hua Hsieh, Szu Hung Chen, Zhen Yu Li, Chun Yen Chang, Hao-Chung Kuo

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

We have demonstrated Si implantation incorporation into GaN HEMTs with a non-alloyed ohmic contact process. We optimized the power density of pulsed laser annealing to activate implanted Si dopants without a thermal metallization process. The experimental results show that the GaN surface will be reformed under the high power density of the illumination conditions. It provides a smooth surface for following contact engineering and leads to comparable contact resistance. The transmission line model (TLM) measurement shows a lower contact resistance to 6.8 × 10-7 Ω • cm2 via non-alloyed contact technology with significantly improved surface morphology of the contact metals. DC measurement of HEMTs shows better current and on-resistance. The on-resistance could be decreased from 2.18 to 1.74 mΩ-cm2 as we produce a lower contact resistance. Pulsed laser annealing also results in lower gate leakage and smaller dispersion under a pulse I-V measurement, which implies that the density of the surface state is improved.

Original languageEnglish
Article number055003
JournalSemiconductor Science and Technology
Volume31
Issue number5
DOIs
StatePublished - 15 Mar 2016

Keywords

  • GaN
  • HEMTs
  • ion implantation
  • pulse laser annealing

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