Structural and electrical characterization of thick GaN layers on Si, GaN, and engineered substrates

Tanaka, Atsunori; Choi, Woojin; Chen, Renjie; Liu, Ren; Mook, William M.; Jungjohann, Katherine Leigh; Yu, Paul K. L.; Dayeh, Shadi A.

doi:10.1063/1.5049393

Structural and electrical characterization of thick GaN layers on Si, GaN, and engineered substrates

Journal Article · Sun Dec 09 23:00:00 EST 2018 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5049393· OSTI ID:1544802

Tanaka, Atsunori ^[1]; Choi, Woojin ^[1]; ^[1]; Liu, Ren ^[1]; Mook, William M. ^[2]; Jungjohann, Katherine Leigh ^[2]; ^[1]; Dayeh, Shadi A. ^[1]

Univ. of California, San Diego, La Jolla, CA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

A major challenge in gallium nitride (GaN) vertical power devices and other large bandgap materials is the high defect density that compromises the performance, reliability, and yield. Defects are typically nucleated at the heterointerface where there are both lattice and thermal mismatches. In this paper, we report the selective area growth (SAG) of thick GaN on Si and on the newly available Qromis Substrate Technology™ (QST) substrates that lead to a significant reduction of the defect densities to a level that is nearly comparable to that on native substrates by defect annihilation. We performed a parametric study of the electrical properties of the SAG GaN layers by fabricating and characterizing Schottky barrier diodes for SAG GaN layer thicknesses of 5, 10, 15, and 20 μm for GaN-on-Si, GaN-on-QST, and GaN-on-GaN diodes. While thicker layers led to a significant reduction in defect densities and improvement in the diode forward current characteristics, the GaN-on-QST diodes exhibited nearly similar characteristics to the GaN-on-GaN diodes. Further improvement in the device structure and/or SAG growth for GaN-on-Si is needed to achieve a comparable performance as the defect densities in the GaN-on-Si are comparable to that of GaN-on-QST substrates.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1544802

Report Number(s):: SAND--2019-8202J; 677440

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 125; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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