Patent ID: 8476086
Filing Date: 2013-07-02
Classification: C30B,H01L

Abstract:
1. A method of manufacturing a plurality of semiconductor devices, each of device principal-face surface area S c predetermined by an at least 1 mm 2 minimum size allowing the device to be functional, on a GaN device wafer screened from a plurality of vapor-phase grown GaN substrates to ensure a minimum 10% yield from the plurality of semiconductor devices, as defined by a minimum reverse breakdown voltage acceptable for the devices to be products, the method comprising: a step of producing a plurality of GaN substrates by an inversion-domain reducing vapor-phase growth process, the substrates each defining a principal face that is either the (0001) Ga face or a surface vicinally misoriented with respect to the (0001) Ga face; a step of testing the plurality of GaN substrates to screen for a minimum 10% device yield, said testing and screening step including a substep of determining the number of inversion domains of 1 μm a step of growing an at least single-lamina, device-forming semiconductor layer onto the principal face of the selected prepared GaN substrates; a step of dividing each of the selected prepared GaN substrates, on which the device-forming semiconductor layer has been grown into chips each of area S a step of reverse-breakdown-voltage testing the device chips for the at least 10% whose reverse breakdown voltage is at or above the acceptable minimum.