An electrically detected magnetic resonance study of performance limiting defects in SiC metal oxide semiconductor field effect transistors

Cochrane, C. J.; Lenahan, P. M.; Lelis, A. J.

doi:10.1063/1.3530600

Cited by 96Silicon Carbide Semiconductor TechnologiesSemiconductor materials and devicesSemiconductor materials and interfaces

An electrically detected magnetic resonance study of performance limiting defects in SiC metal oxide semiconductor field effect transistors

Cochrane, C. J., Lenahan, P. M., Lelis, A. J.·2011·Journal of Applied Physics

DOI 10.1063/1.3530600

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Abstract

In this study, we utilize electrically detected magnetic resonance (EDMR) techniques and electrical measurements to study defects in SiC based metal oxide semiconductor field effect transistors (MOSFETs). We compare results on a series of SiC MOSFETs prepared with significantly different processing parameters. The EDMR is detected through spin dependent recombination (SDR) in most cases. However, in some devices at a fairly high negative bias, the EDMR likely also involves spin dependent trap-assisted tunneling (SDT) between defects on both sides of the SiC/SiO2 interface. At least three different defects have been detected in the magnetic resonance measurements. The defects observed include two at the SiC/SiO2 interface or on the SiC side of the SiC/SiO2 interface: one is very likely a vacancy center with a distribution which extends into the bulk of the SiC and the other is likely a “dangling bond” defect. A third defect, located on the SiO2 side of the SiC/SiO2 interface, has a spectrum very similar to that previously reported for an oxygen deficient silicon coupled to a hydrogen atom. In nearly all cases, we observe a strong dominating single line EDMR spectrum with an isotropic g≈2.0027. In some samples, this strong central line is accompanied by two pairs of considerably weaker side peaks which we link to hyperfine interactions with nearby Si and C atoms. The pattern is physically reasonable for a silicon vacancy in SiC. We therefore tentatively assign it to a silicon vacancy or silicon vacancy associated defect in the SiC. In one set of devices with very high interface trap density we observe another dominating spectrum with g∥=2.0026 and g⊥=2.0010 with the symmetry axis coincident with the [0001] and nearly the SiC/SiO2 interface normal. We ascribe this EDMR spectrum to a “dangling bond” defect. A third EDMR spectrum shows up in some devices at a fairly large negative gate bias. The phase of this spectrum is quite consistently opposite to that of the SDR detected EDMR at other biases. Part of this inverted phase spectrum involves two narrow lines which are separated by ≈10.5 G. Since the center responsible for this spectrum is almost certainly in the SiO2, it is likely due to the so called 10.4 G doublet center, an unpaired electron residing on an oxygen deficient silicon atom coupled to a hydrogen in SiO2. The likely presence of one oxygen deficient silicon defect suggests that other oxygen deficient silicon atom defect sites in the oxide may also be important in SiC/SiO2 devices. Oxygen deficient silicon defects in SiO2 are typically called E′ centers. Our results collectively demonstrate considerable complexity in both the chemical composition and physical distribution of performance limiting defects in SiC transistors, with defects observed on both sides of the SiC/SiO2 interface. Our results most strongly indicate that fairly high densities of intrinsic deep-level defects, likely due to a Si vacancy or a closely related defect, extend into the bulk of the SiC in all but one of the devices prepared utilizing a fairly wide range of processing parameters.

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The interface defect density of SiC/SiO2 is two times higher than Si/SiO2 due to the presence of carbon atoms during thermal oxidation.
“Also, the interface defect density of SiC/SiO 2 is two times higher than Si/SiO 2 due to the presence of carbon atoms during the thermal oxidation [50], [51].”
From AC Power Cycling Test Setup and Condition Monitoring Tools for SiC-Based Traction Inverters (2023) · cites this paper as [51]

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“Also, the interface defect density of SiC/SiO 2 is two times higher than Si/SiO 2 due to the presence of carbon atoms during the thermal oxidation [50], [51].”
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Authors: Cochrane, C. J., Lenahan, P. M., & Lelis, A. J.
Affiliations: Pennsylvania State University (US)
DEVCOM Army Research Laboratory (US)
ORCID: Cochrane, C. J.
Lenahan, P. M.
Lelis, A. J.
Venue: Journal of Applied Physics
Publisher: AIP Publishing
Published: 2011-01-01
Volume: 109
Issue: 1
ISSN: 0021-8979 (ISSN-L)
1089-7550
DOI: 10.1063/1.3530600
OpenAlex: W2027548420
Cited by: 96
References: 29
Citations by year: 2026: 4 · 2025: 3 · 2024: 7 · 2023: 9 · 2022: 5 · 2021: 3 · 2020: 11 · 2019: 7 · 2018: 5 · 2017: 9 · 2016: 5 · 2015: 1 · 2014: 7 · 2013: 5 · 2012: 8
FWCI: 6.05
Type: journal article
Language: en
Open access: closed
Locations: Journal of Applied Physics (publishedVersion)
Funders: Pennsylvania State University
Army Research Laboratory
Topics: Physical Sciences › Engineering › Electrical and Electronic Engineering › Silicon Carbide Semiconductor Technologies
Physical Sciences › Engineering › Electrical and Electronic Engineering › Semiconductor materials and devices
Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Semiconductor materials and interfaces
Keywords: SiC MOSFET, electrically detected magnetic resonance, spin-dependent recombination, SiO2/SiC interface, interface trap density, silicon vacancy, dangling bond defects, hyperfine interaction, g-factor anisotropy, hydrogen

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An electrically detected magnetic resonance study of performance limiting defects in SiC metal oxide semiconductor field effect transistors

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