Imaging device, method for manufacturing imaging device, and electronic device

An electronic device, comprising:

• an imaging device;
• and
• a signal processing unit configured to process a signal output from the imaging device, wherein the imaging device includes:
• a semiconductor substrate including a first surface and a second surface, the first surface being at a light receiving side of the semiconductor substrate, the second surface being opposite to the first surface;
• a first photoelectric conversion unit and a second photoelectric conversion unit disposed in the semiconductor substrate;
• an electric-charge holding unit disposed between the first photoelectric conversion unit and the second photoelectric conversion unit in a cross-sectional view;
• a wiring layer disposed under the semiconductor substrate;
• an insulation film layer disposed between the semiconductor substrate and the wiring layer;
• a first light-shielding film disposed between the wiring layer and the insulation film;
• and
• a second light-shielding film, the second light-shielding film including:
• a first portion disposed between the first photoelectric conversion unit and the electric-charge holding unit, wherein the first portion extends from the first surface of the semiconductor substrate to the second surface of the semiconductor substrate in the cross-sectional view;
• and
• a second portion disposed between the second photoelectric conversion unit and the electric-charge holding unit, wherein the second portion extends from the first surface of the semiconductor substrate to the second surface of the semiconductor substrate in the cross-sectional view, and wherein the second portion contacts the first light-shielding film.