Yellow luminescence and Fermi level pinning in GaN layers

I. Shalish*, L. Kronik, G. Segal, Yoram Shapira, M. Eizenberg, J. Salzman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

A correlation between Fermi level pinning and yellow luminescence in Pt/n-GaN junctions has been studied using Schottky barrier measurements by internal photoemission spectroscopy and complementary deep level spectroscopies. The results show that illumination by photons with energies in the yellow luminescence range causes an unpinning of the interface Fermi level, accompanied by a significant increase of the Schottky barrier height from ∼1 to ∼1.9 eV. This strongly suggests the presence of acceptor states related to the yellow luminescence at the Pt/GaN interface. These states are charged in equilibrium and pin the interface Fermi level but can be optically discharged, resulting in a nearly unpinned interface.

Original languageEnglish
Pages (from-to)987-989
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number7
DOIs
StatePublished - 14 Aug 2000
Externally publishedYes

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