Light-receiving device, imaging unit, and electronic apparatus

An imaging unit comprising:

• a wiring substrate;
• and
• a plurality of light-receiving devices mounted in matrix on the wiring substrate,
• the plurality of light-receiving devices each including
• a pixel region provided on a first principal surface of a semiconductor layer that includes the first principal surface, a second principal surface, and an end surface, and including a plurality of light-receiving pixels each receiving light incident from side of the second principal surface, the first principal surface being closer to the wiring substrate, the second principal surface facing the first principal surface, and
• a low-impurity region provided throughout a gap between the second principal surface and the pixel region, and having a relatively low impurity concentration,
• the light-receiving pixels each including
• one or a plurality of photoelectric current extraction regions each including, on the first principal surface, an anode region and a cathode region, and
• a circuit region that is electrically coupled to each of the cathode regions and is electrically separated from the impurity region.

An electronic apparatus comprising:

• an imaging unit;
• and
• a processing unit that processes image data obtained by the imaging unit,
• the imaging unit including
• a wiring substrate, and
• a plurality of light-receiving devices mounted in matrix on the wiring substrate,
• the plurality of light-receiving devices each including
• a pixel region provided on a first principal surface of a semiconductor layer that includes the first principal surface, a second principal surface, and an end surface, and including a plurality of light-receiving pixels each receiving light incident from side of the second principal surface, the first principal surface being closer to the wiring substrate, the second principal surface facing the first principal surface, and
• a low-impurity region provided throughout a gap between the second principal surface and the pixel region, and having a relatively low impurity concentration,
• the light-receiving pixels each including
• one or a plurality of photoelectric current extraction regions each including, on the first principal surface, an anode region and a cathode region, and
• a circuit region that is electrically coupled to each of the cathode regions and is electrically separated from the impurity region.