Surface band bending and interface alignment of plasma-enhanced atomic layer deposited SiO2 on AlxGa1-xN

Eller, Brianna S.; Nemanich, Robert J.

doi:10.1063/1.5003921

Title: Surface band bending and interface alignment of plasma-enhanced atomic layer deposited SiO2 on AlxGa1-xN

Journal Article · Fri Sep 29 00:00:00 EDT 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5003921· OSTI ID:1395588

Eller, Brianna S.; Nemanich, Robert J.

AlxGa1-xN is characterized by a significant spontaneous and piezoelectric polarization, which increases with the aluminum content. As a result, a surface bound charge is present, which favors compensation by surface states and influences the reliability of AlGaN/GaN devices. This work, therefore, focused on the effects of the polarization charge for GaN and AlGaN with three different aluminum concentrations 15%, 25%, and 35%. The band bending of AlxGa1-xN surfaces was measured after a N2/H2 plasma pretreatment, which reduced the carbon and oxygen contamination below the detection limit of x-ray photoelectron spectroscopy. Surface band bending was then related to surface states, where the band bending of oxygen-free surfaces—as obtained with a high-temperature, immersed hydrogen/nitrogen plasma clean—scales with the aluminum content. In addition, the band offsets at the plasma-enhanced atomic layer deposited SiO2/AlxGa1-xN interface were measured, giving 3.4 eV, 3.3 eV, 3.3 eV, and 3.0 eV for respective 0%, 15%, 25%, and 35% aluminum concentrations. These values are in accordance with the charge neutrality level model, which implies that SiO2 will confine carriers over nearly the full range of the aluminum content.

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Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

OSTI ID:: 1395588

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Vol. 122 Journal Issue: 12; ISSN 0021-8979

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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