Patent ID: 6075275
Filing Date: 2000-06-13
Classification: H01L,Y02E

Abstract:
A PIN photodiode, the photodiode comprising:a first semiconductor substrate having first and second parallel planar surfaces;a first doped region having a first dopant type, wherein the first doped region extends from the first planar surface into the first semiconductor substrate;a second doped region having a second dopant type, wherein the second doped region extends from the first planar surface into the first semiconductor substrate and is spaced apart from the first doped region such that the second doped region surrounds the first doped region within the first semiconductor substrate;an intrinsic region being lightly doped with the second dopant type and disposed between the first and second doped regions such that the intrinsic region surrounds the first doped region and separates the first and second doped regions;a first contact coupled to the first doped region;a second contact coupled to the second doped region; andan oxide layer disposed adjacent the second doped region and extending from the second planar surface of the first semiconductor substrate, wherein a thickness of the oxide layer is controlled such that the oxide layer functions as a dielectric interference reflector.