Optical characterisation of quantum well infra-red detector structures

Author

Guzman, Armando ; Sánchez-Rojas, J.L. ; Tijero, J.M.G. ; Sánchez, J.J. ; Hernando, J. ; Calleja, E. ; Muñoz, E. ; Vergara, G. ; Montojo, M.T. ; Gomez, Luis J. ; Rodriiguez, P. ; Almazan, R. ; Verdú, M.

Author_Institution

ETSI Telecommun., Ciudad Univ., Madrid, Spain

Volume

146

Issue

2

fYear

1999

fDate

8/1/1999 12:00:00 AM

Firstpage

89

Lastpage

92

Abstract

Optical characterisation of GaAs-AlGaAs quantum well infra-red photodetector (QWIP) structures by interband photoluminescence (PL) spectroscopy has been performed. The effect on the low temperature PL spectrum of both the doping concentration in the wells and the presence of thin lateral barriers is analysed. In addition to the main peak (e1-hh1), a second peak at lower energy is observed in doped structures and attributed to a donor-to-acceptor transition. The broadening of the e1-hh1 peak when the doping in the wells is increased is interpreted in terms of the bandfilling effect in the wells. An additional broadening appears when thin lateral barriers with higher content are introduced in the structure. Responsivities as high as 0.5 A/W without external coupling mechanisms of the incident light have been measured in samples showing the above-mentioned features in the PL spectra

Keywords

III-V semiconductors; aluminium compounds; gallium arsenide; infrared detectors; photodetectors; photoluminescence; semiconductor quantum wells; GaAs-AlGaAs quantum well infra-red photodetector; PL spectra; QW IR detector structures; bandfilling effect; donor-to-acceptor transition; doped structures; doping concentration; e1-hh1 peak broadening; external coupling mechanisms; incident light; interband photoluminescence spectroscopy; low temperature PL spectrum; optical characterisation; quantum well infra-red detector structures; responsivities; thin lateral barriers;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings -

Publisher

iet

ISSN

1350-2433

Type

jour

DOI

10.1049/ip-opt:19990183

Filename

788755