Impact of substrate off-angle on the m-plane GaN Schottky diodes

We investigated the effects of the substrate off-angle on the m-plane GaN Schottky diodes. GaN epitaxial layers were grown by metal–organic chemical vapor deposition on m-plane GaN substrates having an off-angle of 0.1, 1.1, 1.7, or 5.1° toward $[000\bar{1}]$ . The surface of the GaN epitaxial layers on the 0.1°-off substrate consisted of pyramidal hillocks and contained oxygen (>10¹⁷ cm⁻³) and carbon (>10¹⁶ cm⁻³) impurities. The residual carbon and oxygen impurities decreased to <10¹⁶ cm⁻³ when the off-angle of the m-plane GaN substrate was increased. The leakage current of the 0.1°-off m-plane GaN Schottky diodes originated from the +c facet of the pyramidal hillocks. The leakage current was efficiently suppressed through the use of an off-angle that was observed to be greater than 1.1°. The off-angle of the m-plane GaN substrate is critical in obtaining high-performance Schottky diodes.

Source:IOPscience

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2019-12-16

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