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Formation and electrical properties of Hf Si_2 grown thermally from evaporated Hf and Si films

So, F. C. T. and Lien, C.-D. and Nicolet, M. -A. (1985) Formation and electrical properties of Hf Si_2 grown thermally from evaporated Hf and Si films. Journal of Vacuum Science and Technology A, 3 (6). pp. 2284-2288. ISSN 0734-2101. doi:10.1116/1.572909.

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2 MeV ^(4)He^+ backscattering spectrometry and x‐ray diffraction have been used to study Hf Si_2 formed by thermal annealing of a Hf Si film on evaporated Si (Sie) at temperatures between 575 and 650 °C. A laterally uniform layer of Hf Si_2 forms and its thickness is proportional to the square root of time at a fixed temperature. The activation energy of this reaction is found to be 3.5±0.3 eV. This transport‐limited process differs from that observed on single crystal Si, where Hf Si2 forms at temperatures above 700 °C by a process believed to be nucleation controlled. Four‐point probe measurements of resistivity and Hall coefficient at room temperature on samples with both Hf Si and Hf Si2 were used to determine that both Hf Si and Hf Si_2 are electron conductors. For Hf Si_2, the electron concentration is 2.9±0.2×10^(21) cm^(−3) and the mobility is 36±4 cm^2/Vs, giving a resistivity of 60±3 μΩ cm. Schottky barrier diodes formed either by reacting a Hf film deposited directly on 〈111〉 Si or by reacting a Hf film with Si^e in a 〈111〉 Si/Hf/Si^e/Hf configuration at temperatures above 600 °C were prepared. The Schottky barrier height of Hf Si2 on n‐type 〈111〉 Si as evaluated from forward and reverse I–V characteristics is 0.54±0.01 eV in both cases.

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Additional Information:© 1985 American Vacuum Society. Received 30 April 1985; accepted 17 May 1985. The authors acknowledge A. Ghaffari and R. Gorris for technical assistance, C. C. Hu for assistance in data analysis, and A. Collinwood for careful typing of the manuscript. The financial support from Varian Associates Research Center is gratefully acknowledged.
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Varian Associates Research CenterUNSPECIFIED
Subject Keywords:electric conductivity; potentials; helium ions; backscattering; thickness; nucleation; hall effect; schottky barrier diodes; temperature effects; annealing; x−ray diffraction; monocrystals; silicon; synthesis; crystal growth; hafnium silicides; fabrication; very high temperature; crystal−phase transformations; activation energy
Issue or Number:6
Classification Code:PACS: 68.55.-a; 73.61.Cw; 73.61.Ey; 73.61.Ga; 73.61.Jc; 73.61.Le; 82.65.+r; 73.30.+y
Record Number:CaltechAUTHORS:20120628-154831998
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Official Citation:Formation and electrical properties of Hf Si[sub 2] grown thermally from evaporated Hf and Si films F. C. T. So, C.-D. Lien, and M-A. Nicolet, J. Vac. Sci. Technol. A 3, 2284 (1985), DOI:10.1116/1.572909
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32180
Deposited By: Jason Perez
Deposited On:28 Jun 2012 23:15
Last Modified:09 Nov 2021 21:25

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