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Application of synchrotron X-ray topography to characterization of ion implanted GaN epitaxial layers for the development of vertical power devices

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Abstract

Ion implantation is an essential step for selective area p-type doping of GaN, which is required for the development of vertical GaN devices that will help realize the potential of wide bandgap semiconductor GaN in power electronics. Changes to the microstructure of GaN epilayers on ion implantation and subsequent annealing were characterized by synchrotron X-ray topography and high-resolution X-ray diffraction (HRXRD). Enlarged contrast of screw and edge types of threading dislocations (TDs) on X-ray topographs after homoepitaxial growth is likely due to interaction of the dislocations with point defects. X-ray topographs reveal ion implantation does not change the distribution of dislocations in the wafer. HRXRD spectra have satellite peaks from lattice damage due to implantation. This damage is completely healed upon annealing. Strain and tilt maps derived from X-ray rocking curve topographs also show that annealing leads to an improvement in lattice bending.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

X-ray topography work is supported by ARPA-E through PNDIODES program (DE-AR0001115; Project Director: I. Kizilyalli). Synchrotron X-ray topographs were recorded using the resources of the Advanced Photon Source (Beamline 1-BM), a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE-AC02-06CH11357. Joint Photon Sciences Institute at Stony Brook University provided partial support for travel and subsistence at the Advanced Photon Source. The views expressed in the article do not necessarily represent the views of the U.S. Department of Energy or the US Government.

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Correspondence to Yafei Liu.

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Liu, Y., Peng, H., Chen, Z. et al. Application of synchrotron X-ray topography to characterization of ion implanted GaN epitaxial layers for the development of vertical power devices. MRS Advances 6, 450–455 (2021). https://doi.org/10.1557/s43580-021-00098-x

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  • DOI: https://doi.org/10.1557/s43580-021-00098-x

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