Global Patent Index - EP 0986827 A1

EP 0986827 A1 2000-03-22 - VOLTAGE-CONTROLLED, WAVELENGTH-SELECTIVE PHOTODETECTOR

Title (en)

VOLTAGE-CONTROLLED, WAVELENGTH-SELECTIVE PHOTODETECTOR

Title (de)

SPANNUNGSGESTEUERTER WELLENLÄNGENSELEKTIVER PHOTODETEKTOR

Title (fr)

PHOTODETECTEUR A SELECTION DE LONGUEUR D'ONDE COMMANDE PAR TENSION

Publication

EP 0986827 A1 (DE)

Application

EP 98928319 A

Priority

  • DE 19723177 A
  • EP 9803089 W

Abstract (en)

[origin: DE19723177A1] The invention relates to a voltage-controlled, wavelength-selective photodetector comprising a double diode consisting of a counter-polarized Si-Schottky diode and a SiGe PIN diode. The short-wave portion ( lambda < 0.9 mu m) of the light entering the detector through a window preferably generates electron-hole pairs in the Si-Schottky diode, while the longer-wave portion (1 mu m < lambda < 2 mu m) passes through the substrate and is preferably absorbed in the epitaxially deposited SiGe superlattice or the quantum well diode. The photocurrents of both detectors flow in physically opposite directions and subtract from each other, resulting in a wavelength-dependent operational sign of the photocurrent. The level of the bias voltage applied determines whether the photocurrent of the Si-Schottky diode or the photocurrent of the Si/Ge PIN diode determines the spectrum. This can be used, for example, in an application for decoding signals by transforming the light signal into an electrical output signal and subtracting the photocurrents of the two detectors which filters out exactly the noise component and thus raises the signal/noise ratio of a light signal.

IPC 1-7 (main, further and additional classification)

H01L 31/0352; H01L 31/108

IPC 8 full level (invention and additional information)

H01L 31/0352 (2006.01); H01L 31/108 (2006.01)

CPC (invention and additional information)

B82Y 20/00 (2013.01); H01L 31/035254 (2013.01); H01L 31/108 (2013.01)

Citation (search report)

See references of WO 9856045A1

Designated contracting state (EPC)

DE GB IT

EPO simple patent family

DE 19723177 A1 19981210; EP 0986827 A1 20000322; US 6342720 B1 20020129; WO 9856045 A1 19981210

INPADOC legal status


2002-07-24 [18W] WITHDRAWN

- Date of withdrawal: 20020531

2002-01-30 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20011214

2000-03-22 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991125

2000-03-22 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE GB IT