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Title: Current Status of the Quality of 4H-SiC Substrates and Epilayers for Power Device Applications

Abstract

ABSTRACT Interfacial dislocations (IDs) and half-loop arrays (HLAs) present in the epilayers of 4H-SiC crystal are known to have a deleterious effect on device performance. Synchrotron X-ray Topography studies carried out on n-type 4H-SiC offcut wafers before and after epitaxial growth show that in many cases BPD segments in the substrate are responsible for creating IDs and HLAs during CVD growth. This paper reviews the behaviors of BPDs in the substrate during the epitaxial growth in different cases: (1) screw-oriented BPD segments intersecting the surface replicate directly through the interface during the epitaxial growth and take part in stress relaxation process by creating IDs and HLAs (Matthews-Blakeslee model [1] ); (2) non-screw oriented BPD half loop intersecting the surface glides towards and replicates through the interface, while the intersection points convert to threading edge dislocations (TEDs) and pin the half loop, leaving straight screw segments in the epilayer and then create IDs and HLAs; (3) edge oriented short BPD segments well below the surface get dragged towards the interface during epitaxial growth, leaving two long screw segments in their wake, some of which replicate through the interface and create IDs and HLAs. The driving force for the BPDs to glidemore » toward the interface is thermal stress and driving force for the relaxation process to occur is the lattice parameter difference at growth temperature which results from the doping concentration difference between the substrate and epilayer.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1328041
Resource Type:
Journal Article
Resource Relation:
Journal Name: MRS Advances; Journal Volume: 1; Journal Issue: 02
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Dudley, M., Wang, H., Guo, Jianqiu, Yang, Yu, Raghothamachar, Balaji, Zhang, J., Thomas, B., Chung, G., Sanchez, E. K., Hansen, D., and Mueller, S. G.. Current Status of the Quality of 4H-SiC Substrates and Epilayers for Power Device Applications. United States: N. p., 2016. Web. doi:10.1557/adv.2016.63.
Dudley, M., Wang, H., Guo, Jianqiu, Yang, Yu, Raghothamachar, Balaji, Zhang, J., Thomas, B., Chung, G., Sanchez, E. K., Hansen, D., & Mueller, S. G.. Current Status of the Quality of 4H-SiC Substrates and Epilayers for Power Device Applications. United States. doi:10.1557/adv.2016.63.
Dudley, M., Wang, H., Guo, Jianqiu, Yang, Yu, Raghothamachar, Balaji, Zhang, J., Thomas, B., Chung, G., Sanchez, E. K., Hansen, D., and Mueller, S. G.. Fri . "Current Status of the Quality of 4H-SiC Substrates and Epilayers for Power Device Applications". United States. doi:10.1557/adv.2016.63.
@article{osti_1328041,
title = {Current Status of the Quality of 4H-SiC Substrates and Epilayers for Power Device Applications},
author = {Dudley, M. and Wang, H. and Guo, Jianqiu and Yang, Yu and Raghothamachar, Balaji and Zhang, J. and Thomas, B. and Chung, G. and Sanchez, E. K. and Hansen, D. and Mueller, S. G.},
abstractNote = {ABSTRACT Interfacial dislocations (IDs) and half-loop arrays (HLAs) present in the epilayers of 4H-SiC crystal are known to have a deleterious effect on device performance. Synchrotron X-ray Topography studies carried out on n-type 4H-SiC offcut wafers before and after epitaxial growth show that in many cases BPD segments in the substrate are responsible for creating IDs and HLAs during CVD growth. This paper reviews the behaviors of BPDs in the substrate during the epitaxial growth in different cases: (1) screw-oriented BPD segments intersecting the surface replicate directly through the interface during the epitaxial growth and take part in stress relaxation process by creating IDs and HLAs (Matthews-Blakeslee model [1] ); (2) non-screw oriented BPD half loop intersecting the surface glides towards and replicates through the interface, while the intersection points convert to threading edge dislocations (TEDs) and pin the half loop, leaving straight screw segments in the epilayer and then create IDs and HLAs; (3) edge oriented short BPD segments well below the surface get dragged towards the interface during epitaxial growth, leaving two long screw segments in their wake, some of which replicate through the interface and create IDs and HLAs. The driving force for the BPDs to glide toward the interface is thermal stress and driving force for the relaxation process to occur is the lattice parameter difference at growth temperature which results from the doping concentration difference between the substrate and epilayer.},
doi = {10.1557/adv.2016.63},
journal = {MRS Advances},
number = 02,
volume = 1,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 2016},
month = {Fri Jan 01 00:00:00 EST 2016}
}