This Letter reports electrical measurements as well as electrically detected magnetic resonance (EDMR) studies of defects created at the SiC/SiO2 interface of a lateral 4H-SiC n-channel metal-oxide-semiconductor field-effect transistor (MOSFET) by hot carrier stress (HCS). Both charge pumping (CP) and mobility measurements indicate severe device degradation due to the electrical stress. In accordance with the electrical measurements, a large increase in the EDMR amplitude by a factor of 27 was observed after 106 s of HCS. The defect observed in the unstressed device is anisotropic with gB||c = 2.0045(4) and gB⊥c = 2.0020(4). After the stress, the g-value changes to gB||c = 2.0059(4) and gB⊥c = 2.0019(4). During HCS, most defects are created near the n-doped drain region of the device. In this region, the crystalline structure of the SiC is distorted due to incorporation of N close to the amorphous dose. The distortion could explain the slight change in the g-value with the dominating defect or defect family remaining the same before and after stress. Although the precise structure of the defect could not be identified due to overlapping spectra and limited measurement resolution, the strong hyperfine side peaks suggest a N related defect.
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28 July 2014
Research Article|
July 31 2014
Electrically detected magnetic resonance study of defects created by hot carrier stress at the SiC/SiO2 interface of a SiC n-channel metal-oxide-semiconductor field-effect transistor
G. Gruber;
G. Gruber
a)
1
KAI GmbH
, Europastraße 8, 9500 Villach, Austria
2Institute of Solid State Physics,
Graz University of Technology
, Petersgasse 16, 8010 Graz, Austria
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P. Hadley;
P. Hadley
2Institute of Solid State Physics,
Graz University of Technology
, Petersgasse 16, 8010 Graz, Austria
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M. Koch;
M. Koch
3Institute of Experimental Physics,
Graz University of Technology
, Petersgasse 16, 8010 Graz, Austria
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T. Aichinger
T. Aichinger
4
Infineon Technologies Austria
, Siemensstraße 2, 9500 Villach, Austria
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a)
Electronic mail: [email protected].
Appl. Phys. Lett. 105, 043506 (2014)
Article history
Received:
May 06 2014
Accepted:
July 16 2014
Citation
G. Gruber, P. Hadley, M. Koch, T. Aichinger; Electrically detected magnetic resonance study of defects created by hot carrier stress at the SiC/SiO2 interface of a SiC n-channel metal-oxide-semiconductor field-effect transistor. Appl. Phys. Lett. 28 July 2014; 105 (4): 043506. https://doi.org/10.1063/1.4891847
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