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Infrared-Photoconductivity Due to Sub-Band Transitions in PbTe/Pb1−xEuxTe and PbSe/Pb1−xMnxSe

Published online by Cambridge University Press:  15 February 2011

Shu Yuan ,
G. Springholz ,
N. Frank ,
H. Krenn ,
G. Bauer  and
M. Kriechbaum
Shu Yuan
Affiliation:
Institute für Halbleiterphysik, Universität Linz, A-4040 Linz, Austria
G. Springholz
Affiliation:
Institute für Halbleiterphysik, Universität Linz, A-4040 Linz, Austria
N. Frank
Affiliation:
Institute für Halbleiterphysik, Universität Linz, A-4040 Linz, Austria
H. Krenn
Affiliation:
Institute für Halbleiterphysik, Universität Linz, A-4040 Linz, Austria
G. Bauer
Affiliation:
Institute für Halbleiterphysik, Universität Linz, A-4040 Linz, Austria
M. Kriechbaum
Affiliation:
Institute für Theortische physik, Universität Graz, A-8010 Graz, Austria
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Abstract

The photoconductive (PC) properties of MBE grown PbTe/Pb1−xEuxTe (x<6.7%) and of PbSe/Pb1−xMnxSe (x<3%) multi quantum (MQW) well samples were investigated in the midinfrared region from 100 meV to 500 meV in the temperature range from 5 K up to 210 K. Whereas in PbTe/Pb1−xEuxTe MQW's electrons and holes are confined in the PbTe layers, PbSe/Pb1−xMnxSe forms a staggered system with electrons confined in the PbSe/Pb1−xMnxSe layers and holes confined in the PbSe layers. Consequently, the transitions between electric subbands in the PbTe/Pb1−xEuxTe MQW's give rise to a step like increase of the PC signal whenever the photon energy hv coincides with the interband transition energies between hole and electron subbands (selection rule Δn = 0). For the range of well widths investigated (42 Å to 91 Å ) distinctive steps in the photoconductivity spectra were observed. In the PbSe/Pb1−xMnxSe MQW's the absorption signals show a typical type II superlattice (SL) behaviour and thus the photoconductivity response is also much weaker than for the PbTe/Pb1−xEuxTe MQW's.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 299: Symposium C2 – Infrared Detectors--Materials, Processing, and Devices , 1994 , 285
Copyright
Copyright © Materials Research Society 1994

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