Patent ID: 11916161
Assignee: LUMENTUM JAPAN, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor light-receiving element, comprising:
a semiconductor substrate;
a high-concentration layer of a first conductivity type formed on the semiconductor substrate;
a low-concentration layer of the first conductivity type formed on the high-concentration layer of the first conductivity type and in contact with the high-concentration layer of the first conductivity type;
a low-concentration layer of a second conductivity type configured to form a PN junction interface together with the low-concentration layer of the first conductivity type; and
a high-concentration layer of the second conductivity type formed on the low-concentration layer of the second conductivity type and in contact with the low-concentration layer of the second conductivity type, wherein:
the high-concentration layer of the first conductivity type has a carrier concentration that is higher than a carrier concentration of the low-concentration layer of the first conductivity type,
the high-concentration layer of the second conductivity type has a carrier concentration that is higher than a carrier concentration of the low-concentration layer of the second conductivity type, and
one or both of the low-concentration layer of the first conductivity type or the low-concentration layer of the second conductivity type includes an absorption layer with a band gap that absorbs incident light.