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Recombination processes in Te‐doped Zn O microstructures
Author(s) -
Iribarren A.,
Fernández P.,
Piqueras J.
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201248600
Subject(s) - cathodoluminescence , materials science , luminescence , microstructure , doping , vacancy defect , spontaneous emission , excitation , intensity (physics) , radiative transfer , analytical chemistry (journal) , optoelectronics , optics , molecular physics , laser , chemistry , crystallography , metallurgy , physics , chromatography , quantum mechanics
Cathodoluminescence (CL) of Te doped elongated ZnO microstructures obtained by a vapour–solid (V–S) technique has been investigated. The CL intensity changes along the microstructures axis are related to the gradient of Te content, which influences the intensity of the ZnO deep‐level (DL) emission band. The main defects are vacancy complexes which are partially passivated by the isoelectronic Te doping. The weight on the total luminescence of the radiative processes related to defects has been estimated. A straightforward method based on the measurement of the band‐to‐band luminescence intensity under constant excitation and experimental conditions has been used. The recombination lifetimes for transition through defect levels were also estimated. SEM image and cathodoluminescence emission of needle‐ and pencil‐like TeO 2 ‐doped ZnO microstructures.