Work function tuning of an ultrathin MgO film on an Ag substrate by generating oxygen impurities at the interface
- Authors
- Cho, Sung Beom; Yun, Kyung-Han; Yoo, Dong Su; Ahn, Kiyong; Chung, Yong-Chae
- Issue Date
- Oct-2013
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- MgO/Ag; Work function; Interface defect; Oxygen impurity
- Citation
- THIN SOLID FILMS, v.544, pp.541 - 544
- Indexed
- SCIE
SCOPUS
- Journal Title
- THIN SOLID FILMS
- Volume
- 544
- Start Page
- 541
- End Page
- 544
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/161811
- DOI
- 10.1016/j.tsf.2012.12.072
- ISSN
- 0040-6090
- Abstract
- Density functional theory was used to investigate the electrostatic effect of various oxygen impurities at the interface of MgO/Ag, including interstitial oxygen defects, substitutional oxygen defects, and reconstructed substitutional oxygen defects. When interstitial and reconstructed substitutional oxygen impurities were generated at the interface, an additional bond with the film was formed and the work function of the interface increased. On the other hand, in the case of substitutional oxygen generated at the interface, the oxygen impurities migrated into the Ag subinterface layer and the work function of the interface was slightly decreased. It can be inferred that the origin of the work function change is the dipole moment induced by oxygen impurities. The results of this study indicate that the work function of MgO/Ag (001) can be finely tuned with interfacial oxygen impurities.
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