Patent ID: 8569804
Filing Date: 2013-10-29
Classification: G01S,H01L,H04N

Abstract:
1. A light receiving device comprising a photoelectric conversion element for detecting a light to generate photoelectrons formed on a first-conductivity-type semiconductor substrate, wherein the light receiving device further comprises a plurality of photoelectron distributors formed on the first-conductivity-type semiconductor substrate, each of the photoelectron distributors has a first transfer unit for transferring the photoelectrons generated in the photoelectric conversion element, a photoelectron hold unit located on one side of the photoelectric conversion element with the first transfer unit interposed therebetween for temporarily holding the photoelectrons generated in the photoelectric conversion element, a second transfer unit located on one side of the first transfer unit with the photoelectron hold unit interposed therebetween for transferring the photoelectrons held in the photoelectron hold unit, and a floating diffusion layer located on one side of the photoelectron hold unit with the second transfer unit interposed therebetween for converting the transferred photoelectrons to a voltage, and a first-conductivity-type impurity region is formed so as to confront a hold gate of the photoelectron hold unit in the vicinity of a surface of the first-conductivity-type semiconductor substrate in the photoelectron hold unit and has a first-level, first-conductivity-type impurity concentration higher than the first-conductivity-type impurity concentration of the first-conductivity-type semiconductor substrate.