Si-implantation activation annealing of GaN up to 1400°C

J. C. Zolper*, J. Han, R. M. Biefeld, S. B. Van Deusen, W. R. Wampler, D. J. Reiger, S. J. Pearton, J. S. Williams, H. H. Tan, R. F. Karlicek, R. A. Stall

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Implant activation annealing of Si-implanted GaN is reported for temperatures from 1100 to 1400°C. Free electron concentrations up to 3.5 × 1020 cm-3 are estimated at the peak of the implanted profile with Hall mobilities of ∼60 cm2V/s for annealing at 1300°C for 30 s with an AlN encapsulant layer. This mobility is comparable to epitaxial GaN doped at a similarly high level. For annealing at >1300°C, the sample must be encapsulated with AlN to prevent decomposition of the GaN layer. Channeling Rutherford backscattering demonstrates the partial removal of the implant damage after a 1400°C anneal with a minimum channeling yield of 12.6% compared to 38.6% for the as-implanted spectrum. Scanning electron microscope images show evidence of decomposition of unencapsulated GaN after a 1300°C anneal and complete sublimation after 1400°C. The use of AlN encapsulation and annealing at temperatures of ~∼300°C will allow the formation of selective areas of highly doped GaN to reduce the contact and access resistance in GaN-based transistors and thyristors.

Original languageEnglish
Pages (from-to)179-184
Number of pages6
JournalJournal of Electronic Materials
Volume27
Issue number4
DOIs
Publication statusPublished - Apr 1998

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