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Comparison of PtSi Films Grown by Solid-State Reaction and by E-Beam Co-Evaporation: Thermal Stability in Air at 1000 °C

Published online by Cambridge University Press:  11 March 2016

Robert T. Fryer  and
Robert J. Lad
Robert T. Fryer*
Affiliation:
Department of Physics & Astronomy and Laboratory for Surface Science & Technology, University of Maine, Orono, ME 04469-5708, U.S.A.
Robert J. Lad
Affiliation:
Department of Physics & Astronomy and Laboratory for Surface Science & Technology, University of Maine, Orono, ME 04469-5708, U.S.A.
*
*(Email: robert.fryer@maine.edu)
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Abstract

Two different methods were used to synthesize 200 nm thick single-phase, orthorhombic-PtSi films: (i) e-beam co-evaporation (EBC) of Pt and Si onto r-sapphire substrates and (ii) solid-state reaction (SSR) of sputtered Pt films on Si (100) wafers. Morphology, electrical conductivity, and crystalline structure were characterized for as-grown films and for films annealed in air at 1000 °C via scanning electron microscopy (SEM), 4-pt conductivity measurements, and in situ X-ray diffraction (XRD). As-grown EBC films exhibit columnar grain morphology and slight (101) crystalline texture, while SSR films exhibit granular morphology with many voids and a strong (002) texture. Above 600 °C, EBC PtSi films rapidly oxidize to form crystalline Pt3Si and amorphous SiO2 phases. Around 1000 °C, the Pt3Si phase melts and c-Pt grains nucleate. After air annealing for 6 h at 1000 °C, room-temperature XRD shows that the oxidized EBC films consist of Pt3Si and Pt phases within a SiO2 matrix and become electrically insulating. SSR films initially form with a (002) o-PtSi orientation and above 900 °C they recrystallize to preferred (101) texture and exhibit an unchanged electrical conductivity and a stable film morphology during 48 h of air annealing at 1000 °C. Separate oxidation mechanisms are proposed for the two film types.

Keywords

thin filmannealingmorphology
Type
Articles
Information
MRS Advances , Volume 1 , Issue 21: Nanomaterials and Synthesis , 2016 , pp. 1539 - 1544
Copyright
Copyright © Materials Research Society 2016 

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References

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