Photoemission study of sputter‐etched InP surfaces
作者:
W. M. Lau,
R. N. S. Sodhi,
B. J. Flinn,
K. H. Tan,
G. M. Bancroft,
期刊:
Applied Physics Letters
(AIP Available online 1987)
卷期:
Volume 51,
issue 3
页码: 177-179
ISSN:0003-6951
年代: 1987
DOI:10.1063/1.98914
出版商: AIP
数据来源: AIP
摘要:
The effects of sputter etching and subsequent surface treatments including thermal annealing and oxygen exposure onn‐InP surfaces have been studied by measuring the photoemission spectra using both Al K&agr; and synchrotron radiation. Results indicate that sputtering with Ar+at 1–3 keV and low current density leaves an In‐rich surface (In/P=2) and, from the movement of the Fermi level relative to the conduction‐band minimum, is seen to introduce acceptor‐type defects. Annealing of the surface causes dissolution of some excess In into the bulk as well as removal of some of these defects. The behavior of the annealed surface to oxygen exposure is similar to that of the cleaved surface with the creation of donor defects.
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