Patent ID: 8927965
Filing Date: 2015-01-06
Classification: B82Y,H01L

Abstract:
1. A light-receiving element, comprising: a III-V group compound semiconductor substrate having a principal surface and a back surface opposite to the principal surface; a light-receiving layer having a type II multi-quantum well structure disposed on the principal surface of the substrate, the type II multi-quantum well structure including a first semiconductor layer and a second semiconductor layer stacked alternately, the first semiconductor layer having a lower conduction band energy than that of the second semiconductor layer, the second semiconductor layer having a higher valence band energy than that of the first semiconductor layer; and a semiconductor absorption layer disposed on the back surface of the substrate, wherein the type II multi-quantum well structure includes a first absorption peak wavelength due to a type II transition from a quantum level in the valence band of the second semiconductor layer to a quantum level in the conduction band of the first semiconductor layer and a second absorption peak wavelength due to a type I transition between the quantum levels of the valence band and conduction band in the first semiconductor layer or the second semiconductor layer, the second absorption peak wavelength being smaller than the first absorption peak wavelength, and the semiconductor absorption layer has an absorption peak wavelength substantially corresponding to the second absorption peak wavelength.