EP 0986827 A1 20000322 - 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
Application
Priority
- DE 19723177 A 19970603
- EP 9803089 W 19980526
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
IPC 8 full level
H01L 31/0352 (2006.01); H01L 31/108 (2006.01)
CPC (source: EP US)
B82Y 20/00 (2013.01 - EP US); H01L 31/035254 (2013.01 - EP US); H01L 31/108 (2013.01 - EP US); Y02E 10/548 (2013.01 - EP)
Citation (search report)
See references of WO 9856045A1
Designated contracting state (EPC)
DE GB IT
DOCDB simple family (publication)
DE 19723177 A1 19981210; EP 0986827 A1 20000322; US 6342720 B1 20020129; WO 9856045 A1 19981210
DOCDB simple family (application)
DE 19723177 A 19970603; EP 9803089 W 19980526; EP 98928319 A 19980526; US 44517200 A 20000403