Long-range transport in an assembly of ZnO ...
Document type :
Compte-rendu et recension critique d'ouvrage
DOI :
Title :
Long-range transport in an assembly of ZnO quantum dots : the effects of quantum confinement, Coulomb repulsion and structural disorder
Author(s) :
Roest, Aarnoud L. [Auteur]
Universiteit Utrecht / Utrecht University [Utrecht]
Germeau, Alexander [Auteur]
Universiteit Utrecht / Utrecht University [Utrecht]
Kelly, John J. [Auteur]
Universiteit Utrecht / Utrecht University [Utrecht]
Vanmaekelbergh, Daniel [Auteur]
Universiteit Utrecht / Utrecht University [Utrecht]
Allan, Guy [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Meulenkamp, Eric A. [Auteur]
Universiteit Utrecht / Utrecht University [Utrecht]
Universiteit Utrecht / Utrecht University [Utrecht]
Germeau, Alexander [Auteur]
Universiteit Utrecht / Utrecht University [Utrecht]
Kelly, John J. [Auteur]
Universiteit Utrecht / Utrecht University [Utrecht]
Vanmaekelbergh, Daniel [Auteur]
Universiteit Utrecht / Utrecht University [Utrecht]
Allan, Guy [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Meulenkamp, Eric A. [Auteur]
Universiteit Utrecht / Utrecht University [Utrecht]
Journal title :
Chemphyschem
Pages :
959-966
Publisher :
Wiley-VCH Verlag
Publication date :
2003
ISSN :
1439-4235
HAL domain(s) :
Sciences de l'ingénieur [physics]
English abstract : [en]
We have studied the storage and long-range transport of electrons in a porous assembly of weakly coupled ZnO quantum dots permeated with an aqueous and a propylene carbonate electrolyte solution. The number of electrons ...
Show more >We have studied the storage and long-range transport of electrons in a porous assembly of weakly coupled ZnO quantum dots permeated with an aqueous and a propylene carbonate electrolyte solution. The number of electrons per ZnO quantum dot is controlled by the electrochemical potential of the assembly; the charge of the electrons is compensated by ions present in the pores. We show with optical and electrical measurements that the injected electrons occupy the S, P, and D type conduction electron levels of the quantum dots; electron storage in surface states is not important. With this method of three-dimensional charge compensation, up to ten electrons per quantum-dot can be stored if the assembly is permeated with an aqueous electrolyte. The screening of the electron charge is less effective in the case of an assembly permeated with a propylene carbonate electrolyte solution. Long-range electron transport is studied with a transistor set-up. In the case of ZnO assemblies permeated with an aqueous electrolyte, two quantum regimes are observed corresponding to multiple tunnelling between the S orbitals (at a low occupation) and P orbitals (at a higher occupation). In a ZnO quantum-dot assembly permeated with a propylene carbonate electrolyte solution, there is a strong overlap between these two regimes.Show less >
Show more >We have studied the storage and long-range transport of electrons in a porous assembly of weakly coupled ZnO quantum dots permeated with an aqueous and a propylene carbonate electrolyte solution. The number of electrons per ZnO quantum dot is controlled by the electrochemical potential of the assembly; the charge of the electrons is compensated by ions present in the pores. We show with optical and electrical measurements that the injected electrons occupy the S, P, and D type conduction electron levels of the quantum dots; electron storage in surface states is not important. With this method of three-dimensional charge compensation, up to ten electrons per quantum-dot can be stored if the assembly is permeated with an aqueous electrolyte. The screening of the electron charge is less effective in the case of an assembly permeated with a propylene carbonate electrolyte solution. Long-range electron transport is studied with a transistor set-up. In the case of ZnO assemblies permeated with an aqueous electrolyte, two quantum regimes are observed corresponding to multiple tunnelling between the S orbitals (at a low occupation) and P orbitals (at a higher occupation). In a ZnO quantum-dot assembly permeated with a propylene carbonate electrolyte solution, there is a strong overlap between these two regimes.Show less >
Language :
Anglais
Popular science :
Non
Source :
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