Patent ID: 8564666
Filing Date: 2013-10-22
Classification: B82Y,H01L

Abstract:
1. An image pickup device comprising a two-dimensional array of pixels that are semiconductor light-receiving elements made of group III-V semiconductors formed on an InP substrate, the image pickup device being configured to capture an image of an object by receiving light in a near-infrared region reflected by the object, wherein each of the semiconductor light-receiving elements includes a light-receiving layer that is formed on the InP substrate and has a multi-quantum well structure composed of group III-V semiconductors; and a diffusion concentration distribution control layer made of group III-V semiconductors is disposed in contact with the light-receiving layer on a side of the light-receiving layer so as to be opposite the side adjacent to the InP substrate, the light-receiving layer has a band gap wavelength of 1.65 to 3 μm, the diffusion concentration distribution control layer has a lower band gap energy than InP, a pn junction is formed for each of the pixels by selective diffusion of an impurity element, and the concentration of the impurity element selectively diffused in the diffusion concentration distribution control layer is decreased to be 5×10