In this paper, we study the transfer of graphene onto InAs/GaAs quantum dots (QDs). The graphene is first grown on Cu foils by chemical vapor deposition and then polymer Polymethyl Methacrylate (PMMA) is deposited on the top of graphene/Cu. High quality graphene sheet has been obtained by lowering the dissolving rate of PMMA using vapor processing. Uncapped as well as capped graphene InAs/GaAs QDs have been studied using optical microscopy, scanning electron microscopy, and Raman spectroscopy. We gather from this that the average shifts Δω of QDs Raman peaks are reduced compared to those previously observed in graphene and GaAs capped QDs. The encapsulation by graphene makes the indium atomic concentration intact in the QDs by the reduction of the strain effect of graphene on QDs and the migration of In atoms towards the surface. This gives us a new hetero-structure graphene–InAs/GaAs QDs wherein the graphene plays a key role as a cap layer.
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7 June 2014
Research Article|
June 04 2014
Improvement of the quality of graphene-capped InAs/GaAs quantum dots Available to Purchase
Riadh Othmen;
Riadh Othmen
a)
1
Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus, 2092 El Manar Tunis, Tunisie
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Kamel Rezgui;
Kamel Rezgui
1
Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus, 2092 El Manar Tunis, Tunisie
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Antonella Cavanna;
Antonella Cavanna
2
CNRS/LPN, Route de Nozay, F-91460 Marcoussis
, France
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Hakim Arezki;
Hakim Arezki
3
Laboratoire de Génie Electrique de Paris
, 11, rue Joliot Curie Plateau de Moulon, 91192 Gif sur Yvette, France
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Fethullah Gunes;
Fethullah Gunes
3
Laboratoire de Génie Electrique de Paris
, 11, rue Joliot Curie Plateau de Moulon, 91192 Gif sur Yvette, France
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Hosni Ajlani;
Hosni Ajlani
1
Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus, 2092 El Manar Tunis, Tunisie
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Ali Madouri;
Ali Madouri
2
CNRS/LPN, Route de Nozay, F-91460 Marcoussis
, France
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Meherzi Oueslati
Meherzi Oueslati
1
Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus, 2092 El Manar Tunis, Tunisie
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Riadh Othmen
1,a)
Kamel Rezgui
1
Antonella Cavanna
2
Hakim Arezki
3
Fethullah Gunes
3
Hosni Ajlani
1
Ali Madouri
2
Meherzi Oueslati
1
1
Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus, 2092 El Manar Tunis, Tunisie
2
CNRS/LPN, Route de Nozay, F-91460 Marcoussis
, France
3
Laboratoire de Génie Electrique de Paris
, 11, rue Joliot Curie Plateau de Moulon, 91192 Gif sur Yvette, France
a)
E-mail: [email protected]
J. Appl. Phys. 115, 214309 (2014)
Article history
Received:
March 05 2014
Accepted:
May 17 2014
Citation
Riadh Othmen, Kamel Rezgui, Antonella Cavanna, Hakim Arezki, Fethullah Gunes, Hosni Ajlani, Ali Madouri, Meherzi Oueslati; Improvement of the quality of graphene-capped InAs/GaAs quantum dots. J. Appl. Phys. 7 June 2014; 115 (21): 214309. https://doi.org/10.1063/1.4880338
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