We present a photoreflectance (PR) study of multi-layer InAs quantum dot (QD) photodetector structures, incorporating InGaAs overgrown layers and positioned asymmetrically within GaAs/AlAs quantum wells (QWs). The influence of the back-surface reflections on the QD PR spectra is explained and a temperature-dependent photomodulation mechanism is discussed. The optical interband transitions originating from the QD/QW ground- and excited-states are revealed and their temperature behaviour in the range of 3–300 K is established. In particular, we estimated the activation energy (∼320 meV) of exciton thermal escape from QD to QW bound-states at high temperatures. Furthermore, from the obtained Varshni parameters, a strain-driven partial decomposition of the InGaAs cap layer is determined.
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14 April 2015
Research Article|
April 10 2015
Temperature-dependent modulated reflectance of InAs/InGaAs/GaAs quantum dots-in-a-well infrared photodetectors
R. Nedzinskas;
R. Nedzinskas
a)
1
Semiconductor Physics Institute
, Center for Physical Sciences and Technology, A. Goštauto 11, LT-01108 Vilnius, Lithuania
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B. Čechavičius;
B. Čechavičius
1
Semiconductor Physics Institute
, Center for Physical Sciences and Technology, A. Goštauto 11, LT-01108 Vilnius, Lithuania
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A. Rimkus;
A. Rimkus
1
Semiconductor Physics Institute
, Center for Physical Sciences and Technology, A. Goštauto 11, LT-01108 Vilnius, Lithuania
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E. Pozingytė;
E. Pozingytė
1
Semiconductor Physics Institute
, Center for Physical Sciences and Technology, A. Goštauto 11, LT-01108 Vilnius, Lithuania
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J. Kavaliauskas;
J. Kavaliauskas
1
Semiconductor Physics Institute
, Center for Physical Sciences and Technology, A. Goštauto 11, LT-01108 Vilnius, Lithuania
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G. Valušis;
G. Valušis
1
Semiconductor Physics Institute
, Center for Physical Sciences and Technology, A. Goštauto 11, LT-01108 Vilnius, Lithuania
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L. H. Li;
L. H. Li
2School of Electronic and Electrical Engineering,
University of Leeds
, Leeds LS2 9JT, United Kingdom
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E. H. Linfield
E. H. Linfield
2School of Electronic and Electrical Engineering,
University of Leeds
, Leeds LS2 9JT, United Kingdom
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a)
Author to whom correspondence should be addressed. Electronic mail: ramunas@pfi.lt
J. Appl. Phys. 117, 144304 (2015)
Article history
Received:
January 26 2015
Accepted:
March 28 2015
Citation
R. Nedzinskas, B. Čechavičius, A. Rimkus, E. Pozingytė, J. Kavaliauskas, G. Valušis, L. H. Li, E. H. Linfield; Temperature-dependent modulated reflectance of InAs/InGaAs/GaAs quantum dots-in-a-well infrared photodetectors. J. Appl. Phys. 14 April 2015; 117 (14): 144304. https://doi.org/10.1063/1.4917204
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