Charge state switching of Cu acceptors in ZnO nanorods

Undoped and Ga-doped ZnO nanorods both exhibit an intense green luminescence (GL) band centered at ∼2.4 eV. Unlike the defect-related GL in undoped nanorods, the GL band in Ga-doped nanorods displays a periodic fine structure separated by 72 meV, which consists of doublets with an energy spacing of...

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Published inApplied physics letters Vol. 110; no. 12
Main Authors Rahman, M. Azizar, Westerhausen, Mika T., Nenstiel, Christian, Choi, Sumin, Hoffmann, Axel, Gentle, Angus, Phillips, Matthew R., Ton-That, Cuong
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 20.03.2017
Subjects
Applied physics
Charge transfer
Computer simulation
Copper
Fine structure
Nanorods
Optical properties
Valence band
Zinc oxide
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Summary:Undoped and Ga-doped ZnO nanorods both exhibit an intense green luminescence (GL) band centered at ∼2.4 eV. Unlike the defect-related GL in undoped nanorods, the GL band in Ga-doped nanorods displays a periodic fine structure separated by 72 meV, which consists of doublets with an energy spacing of 30 ± 3 meV. The emergence of the structured GL is due to the Cu+ state being stabilized by the rise in the Fermi level above the 0/- (Cu2+/Cu+) charge transfer level as a result of Ga donor incorporation. From a combination of optical characterization and simulation using the Brownian oscillator model, the doublet fine structures are shown to originate from two hole transitions with the Cu+ state located at 390 meV above the valence band.
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content type line 14
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4978761