Advanced search
1 file | 1.08 MB

Charge carrier identification in tunneling spectroscopy of core-shell nanocrystals

(2011) PHYSICAL REVIEW B. 84(19).
Author
Organization
Project
Center for nano- and biophotonics (NB-Photonics)
Abstract
Semiconductor PbSe/CdSe core-shell nanocrystals (NCs) in a double barrier tunnel junction have been investigated by means of scanning tunneling spectroscopy at low temperature. From the analysis of the differential conductance peak position as a function of the potential distribution in both potential barriers, we demonstrate a unipolar transport regime for a large amount of NCs. The same charge carriers are injected on both sides of the zero-conductance gap, and the peaks observed at higher energy arise from the charging of the NCs. Similar results are obtained for CdSe/CdS dot-in-rod NCs, indicating that the addition of a shell favors transitions between different charge states rather than single particle excited states. Further characterization of the PbSe/CdSe core-shell NCs by x-ray photoemission spectroscopy reveals that the variations in the transport properties from NC to NC are explained by the occurrence of unprotected PbSe facets that have different orientations in the junction.
Keywords
QUANTUM DOTS, SEMICONDUCTOR NANOCRYSTALS, COLLOIDAL PBSE, BLINKING, SELENIDE, STATES

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 1.08 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Nguyen, TH, J Habinshuti, Yolanda Justo Zarraquiños, Raquel Filipa Gomes Pinto Fernandes, G Mahieu, S Godey, JP Nys, et al. 2011. “Charge Carrier Identification in Tunneling Spectroscopy of Core-shell Nanocrystals.” Physical Review B 84 (19).
APA
Nguyen, TH, Habinshuti, J., Justo Zarraquiños, Y., Gomes Pinto Fernandes, R. F., Mahieu, G., Godey, S., Nys, J., et al. (2011). Charge carrier identification in tunneling spectroscopy of core-shell nanocrystals. PHYSICAL REVIEW B, 84(19).
Vancouver
1.
Nguyen T, Habinshuti J, Justo Zarraquiños Y, Gomes Pinto Fernandes RF, Mahieu G, Godey S, et al. Charge carrier identification in tunneling spectroscopy of core-shell nanocrystals. PHYSICAL REVIEW B. 2011;84(19).
MLA
Nguyen, TH, J Habinshuti, Yolanda Justo Zarraquiños, et al. “Charge Carrier Identification in Tunneling Spectroscopy of Core-shell Nanocrystals.” PHYSICAL REVIEW B 84.19 (2011): n. pag. Print.
@article{1973913,
  abstract     = {Semiconductor PbSe/CdSe core-shell nanocrystals (NCs) in a double barrier tunnel junction have been investigated by means of scanning tunneling spectroscopy at low temperature. From the analysis of the differential conductance peak position as a function of the potential distribution in both potential barriers, we demonstrate a unipolar transport regime for a large amount of NCs. The same charge carriers are injected on both sides of the zero-conductance gap, and the peaks observed at higher energy arise from the charging of the NCs. Similar results are obtained for CdSe/CdS dot-in-rod NCs, indicating that the addition of a shell favors transitions between different charge states rather than single particle excited states. Further characterization of the PbSe/CdSe core-shell NCs by x-ray photoemission spectroscopy reveals that the variations in the transport properties from NC to NC are explained by the occurrence of unprotected PbSe facets that have different orientations in the junction.},
  articleno    = {195133},
  author       = {Nguyen, TH and Habinshuti, J and Justo Zarraqui{\~n}os, Yolanda and Gomes Pinto Fernandes, Raquel Filipa and Mahieu, G and Godey, S and Nys, JP and Carrillo, S and Hens, Zeger and Robbe, O and Turrell, S and Grandidier, B},
  issn         = {1098-0121},
  journal      = {PHYSICAL REVIEW B},
  keyword      = {QUANTUM DOTS,SEMICONDUCTOR NANOCRYSTALS,COLLOIDAL PBSE,BLINKING,SELENIDE,STATES},
  language     = {eng},
  number       = {19},
  pages        = {8},
  title        = {Charge carrier identification in tunneling spectroscopy of core-shell nanocrystals},
  url          = {http://dx.doi.org/10.1103/PhysRevB.84.195133},
  volume       = {84},
  year         = {2011},
}

Altmetric
View in Altmetric
Web of Science
Times cited: