Spintronics;
Low temperature growth;
Zinc oxide;
Optical and magnetic properties;
TEMPERATURE FERROMAGNETISM;
SEMICONDUCTOR;
CO;
IRON;
SPECTROSCOPY;
ELECTRODES;
IMPURITIES;
TRANSITION;
STATES;
IONS;
D O I:
10.1016/j.optmat.2012.03.031
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
Optical and magneto-optical properties of ZnCoO films grown at low temperature by Atomic Layer Deposition are discussed. Strong wide band absorption, with onset at about 2.4 eV, is observed in ZnCoO in addition to Co-related intra-shell transitions. This absorption band is related to Co 2+ to 3+ photo-ionization transition. A strong photoluminescence (PL) quenching is observed, which we relate to Co recharging in ZnO lattice. Mechanisms of PL quenching are discussed. (C) 2012 Elsevier B.V. All rights reserved.