Patent ID: 9466481
Filing Date: 2016-10-11
CPC Classification: C23C,H01L

Claim Text:
1. An epitaxial multi-layer wafer for fabricating electronic devices comprising (i) a group III nitride substrate of Ga 1-x1-y1 Al x1 In y1 N (0≦x1≦1, 0≦y1≦1) having a first side and a second side opposite to the first side and (ii) an active layer of Ga 1-x2-y2 Al x2 In y2 N (0≦x2≦1, 0≦y2≦1) on the first side of the group III nitride substrate, wherein: (a) a dislocation density of the group III nitride substrate is less than about 10 (b) the group III nitride substrate is selected from the group consisting of (i) a group III nitride substrate having an electron concentration higher than about 10 (c) the group III nitride substrate is fabricated from a bulk crystal of Ga (d) the active layer is an epitaxially deposited layer selected from the group consisting of (i) an active layer having an electron concentration lower than about 10 (e) the active layer has a thickness sufficiently large that a depletion region which is formed in the active layer after fabricating the electronic device with a first electrode on the first side of the wafer and a second electrode on the second side of the wafer is outside of the substrate at any applied voltage within an operation range of the electronic device; and (f) a transition layer of Ga