A combined experimental and first principles study of Cu defects in bulk ZnO is presented. Cu particles are epitaxially deposited on the polar O-ZnOð000 1Þ surface at room temperature. Upon heating, a broadening of the quasielastic peak in high resolution electron energy loss spectra is observed, corresponding to an electronic doping effect of Cu atoms in bulk ZnO with an ionization energy of 88 meV. Cu impurities in ZnO, although commonly acting as acceptors, are presently observed to induce shallow donor states. We assign these to interstitial Cu species on the basis of a hybrid density functional study.

Qiu, H., Gallino, F., DI VALENTIN, C., Wang, Y. (2011). Shallow donor states induced by in-diffused Cu in ZnO: a combined HREELS and hybrid DFT study. PHYSICAL REVIEW LETTERS, 106(6), 066401-066404 [10.1103/PhysRevLett.106.066401].

Shallow donor states induced by in-diffused Cu in ZnO: a combined HREELS and hybrid DFT study

GALLINO, FEDERICO;DI VALENTIN, CRISTIANA;
2011

Abstract

A combined experimental and first principles study of Cu defects in bulk ZnO is presented. Cu particles are epitaxially deposited on the polar O-ZnOð000 1Þ surface at room temperature. Upon heating, a broadening of the quasielastic peak in high resolution electron energy loss spectra is observed, corresponding to an electronic doping effect of Cu atoms in bulk ZnO with an ionization energy of 88 meV. Cu impurities in ZnO, although commonly acting as acceptors, are presently observed to induce shallow donor states. We assign these to interstitial Cu species on the basis of a hybrid density functional study.
Articolo in rivista - Articolo scientifico
HREELS, DFT, ZnO, Copper
English
2011
106
6
066401
066404
066401
open
Qiu, H., Gallino, F., DI VALENTIN, C., Wang, Y. (2011). Shallow donor states induced by in-diffused Cu in ZnO: a combined HREELS and hybrid DFT study. PHYSICAL REVIEW LETTERS, 106(6), 066401-066404 [10.1103/PhysRevLett.106.066401].
File in questo prodotto:
File Dimensione Formato  
PRL_yuemin_2011.pdf

accesso aperto

Dimensione 934.62 kB
Formato Adobe PDF
934.62 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/36927
Citazioni
  • Scopus 34
  • ???jsp.display-item.citation.isi??? 33
Social impact