Patent ID: 11888078
Assignee: OSRAM OPTO SEMICONDUCTORS GMBH
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor photodiode comprising:
a top side with an active surface area for light entry into the photodiode;
a bottom side opposite to the top side;
a bulk structure comprising a single semiconductor material, the bulk structure comprising:
a p+-type layer and an n-type layer, which together form the p-n junction of the photodiode, wherein one of the two layers of the p-n junction is an upper p-n junction layer and the other one is a lower p-n junction layer, wherein the upper p-n junction layer is located proximate to the active surface area;

an n-type enrichment layer and a p-type guard ring, wherein the guard ring runs along the circumference of the p+-type layer and is embedded in the n-type layer, and wherein the n-type enrichment layer is located below the p+-type layer, in direct surface contact with the p+-type layer and embedded in the n-type layer; and
a semiconductor light absorption layer;
wherein:
the semiconductor light absorption layer defines the active surface area;
the semiconductor light absorption layer is arranged on top of the bulk structure, above the upper p-n junction layer;
the semiconductor light absorption layer comprises a different semiconductor material from the semiconductor material of the bulk structure; and
a precursor layer is arranged between the bulk structure and the semiconductor light absorption layer, wherein the semiconductor light absorption layer is in direct contact with on the precursor layer.