Patent ID: 9748353
Date: 2017-08-29
CPC Classifications: H01L,Y02E

Claim:
1. A method of making a GaN device, comprising: forming a GaN substrate having an upper surface; forming a plurality of spaced-apart first metal contacts directly on the upper surface of the GaN substrate, the contacts spaced apart by exposed portions of the upper surface; forming a layer of insulating GaN on the exposed portions of the upper surface; forming a stressor layer on the contacts and the layer of insulating GaN, the stressor layer having a first surface; forming a handle substrate on the first surface of the stressor layer; spalling the GaN substrate that is located beneath the stressor layer to separate a layer of GaN and expose a stressor layer second surface and removing the handle substrate; bonding the first surface of the stressor layer to a thermally conductive substrate; forming a plurality of vertical channels having opposing sidewalls through the insulating GaN to provide exposed portions of the layer of insulating GaN to define a plurality of device structures, each device structure comprising at least one contact; removing the exposed portions of the layer of insulating GaN to electrically isolate the device structures; and forming an ohmic contact layer on the stressor layer second surface; and forming a plurality of second metal contacts on the ohmic contact layer.