Compensation of n-type GaN

Gyu Chul Yi*, Bruce W Wessels

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

Compensation in Se-doped n-type GaN prepared by atmospheric pressure metalorganic vapor phase epitaxy was studied. Hydrogen selenide was the dopant source. The carrier concentration is linearly proportional to the H2Se pressure for low partial pressures and proportional to the cube root at high partial pressures. Carrier concentrations as high as 6 × 1019 cm-3 at 295 K were achieved. From Hall-effect measurements, the Se-doped GaN was shown to be highly compensated even for heavily n-type material. The defects responsible for the compensation were investigated using low-temperature photoluminescence. A strong acceptor-related transition at 3.447 eV at 15 K was observed in the heavily doped layer. The observed doping dependence of Se in GaN is attributed to compensation by triply charged vacancies which is consistent with recent theoretical calculations on defect formation in n-type material.

Original languageEnglish (US)
Pages (from-to)3028-3030
Number of pages3
JournalApplied Physics Letters
Volume69
Issue number20
DOIs
StatePublished - Nov 11 1996

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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