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Morphology and optical properties of MgO thin films on Mo(001)

被引：71
作者：
Benedetti, S.
Benia, H. M.
Nilius, N.
Valeri, S.
Freund, H. J.
机构：
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
[2] Univ Modena, Dipartimento Fis, I-41100 Modena, Italy
[3] CNR, INFM, Natl Res Ctr NanoStruct & BioSyst Surfaces, I-41100 Modena, Italy
来源：
CHEMICAL PHYSICS LETTERS | 2006年 / 430卷 / 4-6期
关键词：
D O I：
10.1016/j.cplett.2006.08.130
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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. (c) 2006 Elsevier B.V. All rights reserved.
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页码：330 / 335
页数：6
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