Semiconductor device and electronic apparatus including pn junction portions

Abstract

Provided is a semiconductor device capable of improving the optical response speed. The semiconductor device includes a pixel array portion in which a plurality of pixels are arranged in a matrix, each of the plurality of pixels including: a pixel forming region partitioned by a separation region in a semiconductor layer; a first semiconductor region of a first conductivity type and a second semiconductor region of a second conductivity type sequentially arranged from a first surface side of the pixel forming region toward a second surface side opposite to the first surface; a pn junction portion in which the first semiconductor region and the second semiconductor region are bonded; a charge extraction region of the second conductivity type provided in a side wall of the separation region; and a relay region of the second conductivity type provided at a position deeper than the second semiconductor region so as to be connected to the charge extraction region and the second semiconductor region. A plurality of the pn junction portions are scattered apart from each other, and the relay region has a higher impurity concentration than the second semiconductor region and terminates at a peripheral portion so as to surround a central portion of a surface of the second semiconductor region opposite to the pn junction portion side.