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Microstructural Control Of Thin Film Si Using Low Energy, High Flux Ions In Reactive Magnetron Sputter Deposition

Published online by Cambridge University Press:  17 March 2011

Jennifer E. Gerbi  and
John R. Abelson
Jennifer E. Gerbi
Affiliation:
Coordinated Science Laboratories and the Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign Urbana, IL Coordinated Science Laboratories and the Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign Urbana, IL email:gerbi@uiuc.edu
John R. Abelson
Affiliation:
Coordinated Science Laboratories and the Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign Urbana, IL
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Abstract

Using plasma growth sources with concurrent particle bombardment, silicon thin films can be deposited with various phases and microstructures. DC Reactive Magnetron Sputtering (RMS), in particular, can produce amorphous, mixed-phase, nanocrystalline, polycrystalline, porous columnar, and epitaxial Si films. In particular, a large flux of low energy, heavy ions strongly affects the phase and microstructure, and therefore the resulting film qualities. Lowpressure (1.6 mTorr) RMS is particularly suited for this type of plasma manipulation: we bias the substrate to produce the ion energy of choice, and use an external magnetic field to control the ion/neutral flux ratio, therefore decoupling the parameters of bombardment energy and flux. In this work, we study the influence of slow (<40eV), heavy (Ar+), ions in RMS deposition on the formation kinetics and microstructures of microcrystalline, mixed-phase, and poly crystalline Si films. The analytical methods are ellipsometry, Raman scattering, and AFM. We will show how ion bombardment influences the direct nucleation of extremely smooth polycrystalline Si on glass at temperatures below 400°C, enhances the crystallinity of this polycrystalline Si in the bulk, and produces nanocrystalline Si with tailored grain sizes at temperatures below 200°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 609: Symposium A – Amorphous & Heterogeneous Silicon Thin Films – 2000 , 2000 , A5.3
Copyright
Copyright © Materials Research Society 2000

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References

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