Barium adsorption on hydrogenated Si (100)2 x 1 surfaces
Φόρτωση...
Ημερομηνία
Συγγραφείς
Papageorgopoulos, D. S.
Vlachos, C. A.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Physics: Condensed Matter
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
An experimental study of Ba and H adsorption on ##IMG## [http://ej.iop.org/images/0953-8984/8/45/015/img2.gif] by Auger electron spectroscopy, thermal desorption spectroscopy, low-energy electron diffraction, electron energy loss spectroscopy, and work function measurements has been made. Measurements of hydrogen adsorption on a clean silicon surface have been made mainly for reference purposes. H on Si forms two different states, known as monohydride state ##IMG## [http://ej.iop.org/images/0953-8984/8/45/015/img3.gif] and dihydride state ##IMG## [http://ej.iop.org/images/0953-8984/8/45/015/img4.gif] . Preadsorption of H made the surface order more stable without changing the sticking coefficient of Ba on the Si surface. The results supported the double-layer (DL) model for the first Ba layer on the monohydrided Si surface. Ba adatoms up to ##IMG## [http://ej.iop.org/images/0953-8984/8/45/015/img5.gif] ML on the dihydride phase were relaxed at symmetric and equivalent sites following the ##IMG## [http://ej.iop.org/images/0953-8984/8/45/015/img6.gif] symmetry of the restored Si surface. TDS measurements showed that during Ba adsorption on the monohydride phase some of the H atoms were removed from their initial adsorption sites, and a new H energy state was formed at ##IMG## [http://ej.iop.org/images/0953-8984/8/45/015/img7.gif] which was attributed to the weakening of the Si - H bond in the presence of Ba adatoms. When Ba deposition took place on the dihydride phase, two new H states were successively developed. The first state at ##IMG## [http://ej.iop.org/images/0953-8984/8/45/015/img8.gif] was attributed to ##IMG## [http://ej.iop.org/images/0953-8984/8/45/015/img9.gif] formation, and the subsequent one to a complex Ba - H - Si compound near ##IMG## [http://ej.iop.org/images/0953-8984/8/45/015/img10.gif] . The presence of hydrogen caused a considerable delay of barium overlayer metallization, in contrast to the early metallization of alkali on hydrogenated surfaces.
Περιγραφή
Λέξεις-κλειδιά
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
http://stacks.iop.org/0953-8984/8/i=45/a=015
Γλώσσα
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών