Surface reactions and interdiffusion
作者:
R. Z. Bachrach,
R. S. Bauer,
期刊:
Journal of Vacuum Science and Technology
(AIP Available online 1979)
卷期:
Volume 16,
issue 5
页码: 1149-1153
ISSN:0022-5355
年代: 1979
DOI:10.1116/1.570179
出版商: American Vacuum Society
关键词: ALUMINIUM;INTERFACES;CHEMISTRY;DIFFUSION;SURFACES;PHOTOEMISSION;SPECTROSCOPY;SYNCHROTRON RADIATION;LINE WIDTHS;REACTION HEAT;ELECTRIC CONDUCTIVITY;VACANCIES;ALUMINIUM OXIDES;ULTRAHIGH VACUUM;EPITAXY
数据来源: AIP
摘要:
Local interface chemistry is important to understand before proceeding to unravel the electronic properties of interfaces. Characterization of the intrinsic aspects of reactions and interdiffusion is also important to understand possible device size limitations. Various types of local reactions are possible and we have investigated these with surface sensitive photoemission and photoyield spectroscopy using synchrotron radiation excitation. We show for both compound semiconductor and for oxide surfaces that reactions can occur which locally determine the chemical phases present. The heat of these reactions can drive the interdiffusion process. We present results for the important systems Al–GaAs, Al‐oxidized GaAs and Al–SiO2. We compare these results with our previous results for Ge and Ga on GaAs as well as those obtained by others. We demonstrate that theI–Vbehavior of Ga onp‐GaAs is ohmic and attribute this non‐schottky character to As diffusion and vacancy production at the interface. Diffusion can clearly be identified as distinct from island formation by analyzing the core photoelectron line shape; Ge grown on GaAs(110) at differing substrate temperatures provides an illustrative example. Interfacial reactions are observed in real time for Al2O3formation by Al reduction of oxidized Si.
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