Publication Date:
2006
abstract:
Thin MgO films with a nominal thickness ranging between 1 and 60 ML have been grown on a Mo(001) surface. The film morphology
was studied by LEED and STM, revealing the presence of a coincidence pattern with the Mo support in the low coverage regime, a
dislocation network at medium thickness and a rather flat and defect-poor MgO surface for thicker layers. The MgO optical properties
were investigated as a function of film thickness by analyzing electro-luminescence spectra obtained via electron injection from the STM
tip into well-defined surface areas. The spectra are characterized by two distinct emission bands at 3.1 and 4.4 eV. Their origin is discussed
in the light of earlier photo-luminescence measurements on MgO nanocubes and smokes.
was studied by LEED and STM, revealing the presence of a coincidence pattern with the Mo support in the low coverage regime, a
dislocation network at medium thickness and a rather flat and defect-poor MgO surface for thicker layers. The MgO optical properties
were investigated as a function of film thickness by analyzing electro-luminescence spectra obtained via electron injection from the STM
tip into well-defined surface areas. The spectra are characterized by two distinct emission bands at 3.1 and 4.4 eV. Their origin is discussed
in the light of earlier photo-luminescence measurements on MgO nanocubes and smokes.
Iris type:
01.01 Articolo in rivista
List of contributors:
Valeri, Sergio; Benedetti, Stefania
Published in: