Patent ID: 6046464
Filing Date: 2000-04-04
Classification: H01L,H01S,Y02E

Abstract:
An ohmic contact for a semiconductor device formed of Group III-V nitride compound semiconductor materials and including a first layer comprising a first binary Group III-V nitride compound semiconductor material or an alloy thereof, said first binary Group III-V nitride compound semiconductor material or an alloy thereof comprising a first Group III element and nitrogen, and which is doped a predetermined conductivity type, said ohmic contact comprising:a second layer comprising a multiple quantum well including alternating layers of said first binary Group III-V nitride compound semiconductor material or an alloy thereof, and a second binary Group III-V nitride compound semiconductor material or an alloy thereof, on said first layer, said alternating layers of said first binary group III-V nitride compound semiconductor material or an alloy thereof and said second binary Group III-V nitride compound semiconductor material or an alloy thereof being doped said predetermined conductivity type, wherein the thickness of said layers of said second binary Group III-V nitride compound semiconductor material or an alloy thereof increases from adjacent said first layer to opposite said first layer;a third layer comprising said second binary Group III-V nitride compound semiconductor material or an alloy thereof, on said second layer, said second binary Group III-V nitride compound semiconductor material or an alloy thereof being doped said predetermined conductivity type; anda conductor layer on said third layer.