Patent ID: 9666617
Date: 2017-05-30
CPC Classifications: H01L,H04N

Claim:
1. A method of manufacturing an imaging device, the method comprising: forming a photodiode, for each of a number of pixels, on a top surface of a semiconductor layer, and forming a floating diffusion section and a reading circuit on the top surface of the semiconductor layer, the photodiode being configured to perform photoelectric conversion and to generate electric charge in accordance with an amount of received light, the floating diffusion section being configured to accumulate the electric charge generated in the photodiode, and the reading circuit configured to output a pixel signal having a voltage in accordance with a level of the electric charge accumulated in the floating diffusion section; and concurrently forming a groove portion and a concave portion on a bottom surface of the semiconductor layer, the groove portion being configured to electrically separate the photodiode for each of the pixels, and the concave portion extending into a part or a whole of a bottom surface of the floating diffusion section, a part or a whole of a bottom surface of a source-drain region of a transistor, or both.