Imaging device and imaging apparatus

An imaging apparatus, comprising:

• a pixel including a first photoelectric conversion unit and a second photoelectric conversion unit, wherein
• the first photoelectric conversion unit is adjacent to a first surface of a semiconductor substrate,
• the first photoelectric conversion unit is configured to:
• perform photoelectric conversion of incident light;
• generate a first charge based on the photoelectric conversion of the incident light;
• and
• transmit the incident light to the second photoelectric conversion unit,
• the second photoelectric conversion unit is in the semiconductor substrate, and
• the second photoelectric conversion unit is configured to:
• perform photoelectric conversion of the incident light transmitted by the first photoelectric conversion unit;
• and
• generate a second charge based on the photoelectric conversion of the incident light;
• a pixel circuit on a second surface of the semiconductor substrate, wherein
• the second surface of the semiconductor substrate is different from the first surface of the semiconductor substrate, and
• the pixel circuit is configured to generate an image signal based on each of the generated first charge and the generated second charge;
• a light-shielding wall at a boundary of the pixel in the semiconductor substrate, wherein
• the light-shielding wall is configured to shield the incident light, and
• the light-shielding wall comprises a metal;
• a first insulating film between the light-shielding wall and the semiconductor substrate;
• a through electrode on the light-shielding wall, wherein
• the through electrode is configured to transmit each of the generated first charge and the generated second charge to the pixel circuit, and
• the through electrode penetrates the semiconductor substrate;
• a second insulating film between the light-shielding wall and the through electrode;
• a protrusion at an end of the light-shielding wall;
• and
• a processing circuit configured to process the generated image signal.