Patent ID: 6909161
Filing Date: 2005-06-21
Classification: H01L,Y02E

Abstract:
1. A photodiode including an n-type semiconductor electrode layer, an optical absorption layer having a first semiconductor optical absorption layer and a second semiconductor optical absorption layer having a p-type, and a p-type semiconductor electrode layer, which are stacked sequentially, said photodiode further including an n-type electrode formed on said n-type semiconductor electrode layer, and a p-type electrode formed on said p-type semiconductor electrode layer, wherein when a specified reverse-bias is applied across said n-type electrode and said p-type electrode, said first semiconductor optical absorption layer is depleted, and said second semiconductor optical absorption layer remains neutral in a region other than a region near an interface with said first semiconductor optical absorption layer, and wherein in said optical absorption layer with a fixed layer width equal to a sum (W=W a ratio between W