SPECTROSCOPIC EVIDENCE FOR REDUCTION OF UNOCCUPIED STATES IN THE BAND-GAP OF GAP(001) BY H2S PASSIVATION

Authors
FUKUDA Y SHIMOMURA M SANADA N NAGOSHI M
Citation
Y. Fukuda et al., SPECTROSCOPIC EVIDENCE FOR REDUCTION OF UNOCCUPIED STATES IN THE BAND-GAP OF GAP(001) BY H2S PASSIVATION, Journal of applied physics, 76(6), 1994, pp. 3632-3634
Citations number
20
Categorie Soggetti
Physics, Applied
Journal title
Journal of applied physics → ACNP
ISSN journal
00218979
Volume
76
Issue
6
Year of publication
1994
Pages
3632 - 3634
Database
ISI
SICI code
0021-8979(1994)76:6<3632:SEFROU>2.0.ZU;2-2
Abstract
Clean and H,S-adsorbed GaP(001) surfaces have been studied by inverse and ultraviolet photoemission spectroscopy (IPES) and (UPS) and by hig h-resolution electron energy loss spectroscopy. H,S is found to be dis sociated on the surface, leaving only sulfur on it, which is consisten t with UPS results. IPES spectra show strong reduction in intensity at 1.5 and 4.5 eV above the Fermi level upon sulfur adsorption, The redu ction in the former indicates tremendous decrease of unoccupied states , which correspond to dangling bonds of surface gallium atoms, in the band gap by H2S passivation.