Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3291620
Keywords
alumina; atomic layer deposition; conduction bands; electric breakdown; energy gap; hafnium compounds; high-k dielectric thin films; permittivity; semiconductor-insulator boundaries; valence bands; X-ray photoelectron spectra
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Energy band alignment and band gap of Al2O3 and HfAlO films grown by atomic layer deposition on 4H-SiC were determined using x-ray photoelectron spectroscopy. Al2O3 exhibited a symmetric band profile with a conduction band offset (Delta E-C) of 1.88 eV and a valence band offset (Delta E-V) of 1.87 eV. HfAlO yielded a smaller Delta E-C of 1.16 eV and Delta E-V of 1.59 eV. The higher dielectric constant and higher effective breakdown field of HfAlO compared to Al2O3, coupled with sufficient electron and hole barrier heights, makes it a potential dielectric for use on 4H-SiC, and provokes interest in further investigation of HfAlO/4H-SiC properties.
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