Patent ID: 8445950

Claim:
A solid-state imaging device comprising: a semiconductor substrate of a first conductivity type, including a first face, a second face being opposite to the first face, and a trench extending from the first face into the semiconductor substrate; a plurality of pixels provided in the semiconductor substrate, each of the pixels having a semiconductor region of a second conductivity type that converts incident light from the first face of the semiconductor substrate into signal charges and stores the signal charges; a readout circuit provided on a side of the second face of the semiconductor substrate, and reading out the signal charges stored in the pixels; and a pixel separation structure provided between adjacent ones of the pixels in the semiconductor substrate, the pixel separation structure including a stack film that is buried in the trench in the semiconductor substrate, the stack film including a first insulating film provided along side faces and a bottom face of the trench, and a fixed charge film provided in the trench to cover the first insulating film and retains fixed charges that are non-signal charges; wherein the semiconductor substrate is a silicon substrate, the first insulating film is a silicon oxide film, and the fixed charge film is an oxide dielectric film containing at least one of hafnium (Hf), zirconium (Zr), and titanium (Ti).