Patent ID: 11935969
Assignee: EPISTAR CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A photodetector comprising:
a first semiconductor layer;
an absorption structure located on the first semiconductor layer, and having a first conduction band, a first valence band, and a first band gap;
a second semiconductor layer located on the absorption structure, and having a second conduction band, a second valence band, and a second band gap;
a barrier structure located between the absorption structure and the second semiconductor layer, and having a third conduction band, a third valence band, and a third band gap;
a modified region formed in the second semiconductor layer, the barrier structure and a part of the absorption structure;
a first electrode disposed on the second semiconductor layer; and
a contact structure located between the first electrode and the second semiconductor layer,
wherein the first semiconductor layer has a first conductive type and the modified region has a second conductive type different from the first conductive type, and
wherein the third conduction band is greater than the second conduction band or the third valence band is less than the second valence band.