TITLE

Influence of crystal polarity on the properties of Pt/GaN Schottky diodes

AUTHOR(S)
Karrer, Uwe; Ambacher, Oliver; Stutzmann, Martin
PUB. DATE
September 2000
SOURCE
Applied Physics Letters;9/25/2000, Vol. 77 Issue 13
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Si-doped epitaxial GaN layers with Ga- and N-face polarity were grown by plasma-induced molecular-beam epitaxy (PIMBE) in order to characterize the influence of polarity on the electrical properties of Pt Schottky diodes. Different barrier heights for Pt onto these two materials are obtained from the dependence of the effective barrier height versus ideality factor, determined by I-V measurements to be 1.1 and 0.9 eV for Ga- and N-face GaN, respectively. C-V measurements confirm the greater barrier heights for Ga-face material. A possible explanation for this behavior can be a different band bending of the conduction and valence band, inferred from the self-consistent solution of the Schro¨dinger-Poisson equation, including polarization-induced surface and interface charges, which result from the different spontaneous polarization in epitaxial layers with different polarity. © 2000 American Institute of Physics.
ACCESSION #
4414907

 

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