Interfacial reactions between Ni films and GaAs
作者:
A. Lahav,
M. Eizenberg,
Y. Komem,
期刊:
Journal of Applied Physics
(AIP Available online 1986)
卷期:
Volume 60,
issue 3
页码: 991-1001
ISSN:0021-8979
年代: 1986
DOI:10.1063/1.337343
出版商: AIP
数据来源: AIP
摘要:
The metallurgical examination of solid‐state reaction between nickel thin films and single‐crystal GaAs substrates and the resultant electrical properties of the contacts are reported. Annealing at 100–300 °C in forming gas led to formation of a metastable hexagonal phase Ni2GaAs which was stabilized due to its epitaxial growth on (001) and (111) GaAs substrates, as follows: (101¯1)Ni2GaAs∥(001)GaAs and (0001)Ni2GaAs∥(111)GaAs. Nickel atoms were found to be the dominant diffusing species during the ternary phase growth. Ni2GaAs is stable on (111)GaAs up to at least 600 °C, compared to 350 °C on (001)GaAs. The larger stability on (111) is explained by the better epitaxial match found in this case. Reaction on (001)GaAs in the temperature range of 350–550 °C resulted in decomposition of Ni2GaAs by NiAs precipitation. After annealing at 600 °C the reacted film was composed of two phases: NiGa and NiAs. The electrical properties of the contacts were correlated to the phase interfacing the substrate. The Ni2GaAs formed rectifying contact with a barrier height of 0.84 eV, whereas when NiGa and NiAs were at the interface an ohmic behavior was observed.
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