US 2003/0116814 A1 · Photodiode

Abstract

A photodiode (A) comprises a substrate, a light receiving layer having a band gap wavelength and including a pn-junction and at least an absorption layer having a band gap wavelength λg. One of the absorption layers is sandwiched between the substrate and the light receiving layer, the band gap wavelength λg of the absorption layer is shorter than the receiving signal wavelength λ2 but longer than noise wavelength λ1(λ1<λg<λ2). Otherwise a photodiode (B) has two absorption layers epitaxially made on the substrate. One absorption layer is formed on the top surface of the substrate. The other absorption layer is formed on the bottom surface of the substrate. The absorption layers annihilate the noise λ1. The PD has no sensitivity to λ1.

Claims66

Dependent claims

A photodiode comprising:

a substrate having a top surface and a bottom surface;
a light receiving layer being formed above the top surface of the substrate and including a pn-junction, a p-region and an n-region;
and
at least an absorption layer having a band gap wavelength λg and being sandwiched between the substrate and the light receiving layer;
the band gap wavelength λg of the absorption layer being shorter than a band gap wavelength of the light receiving layer.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/307,278Filed 2 Dec 2002

Priority

JP 201519/199915 Jul 1999

Published

26 Jun 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

H10F 30/2215
The potential barrier being a PN homojunction: the devices comprising active layers made of only Group III-V materials
G02B 6/12004
Of the integrated circuit kind: combinations of two or more optical elements
H10F 77/14
Semiconductor bodies: shape of semiconductor bodies; Shapes, relative sizes or dispositions of semiconductor regions within semiconductor bodies
H10F 77/334
For filtering or shielding light, e.g. multicolour filters for photodetectors: for shielding light, e.g. light blocking layers or cold shields for…

Photodiode

Life of this patent

Photodiode

Life of this patent

Abstract

Claims66