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Lpcvd Polycrystalline Silicon Thin Films: The Evolution of Structure, Texture and Stress

Published online by Cambridge University Press:  25 February 2011

P. Krulevitch ,
Tai D. Nguyen ,
G. C. Johnson ,
R. T. Howe ,
H. R. Wenk  and
R. Gronsky
P. Krulevitch
Affiliation:
Berkeley Sensor & Actuator Center, Department of Mechanical Engineering,
Tai D. Nguyen
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering, Center for X-Ray Optics, Lawrence Berkeley Laboratory,
G. C. Johnson
Affiliation:
Berkeley Sensor & Actuator Center, Department of Mechanical Engineering,
R. T. Howe
Affiliation:
Berkeley Sensor & Actuator Center, Department of Electrical Engineering and Computer Science,
H. R. Wenk
Affiliation:
Department of Geology and Geophysics,
R. Gronsky
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering,
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Abstract

An investigation of undoped LPCVD polycrystalline silicon films deposited at temperatures ranging from 605 to 700 C and silane pressures from 300 to 550 mTorr revealed large variations in stress with processing conditions and a correlation between stress and texture. TEM and HRTEM analysis show that morphology differences also exist. At lower temperatures (≈605 C) and higher pressures (≈400 mTorr), the films appear to deposit in an amorphous state and crystallize during the deposition to form microstructures characterized by equi-axed grains, tensile residual stress, and a texture with {110} and {11/} (/=2 or 3) components. Higher temperatures (between 620 and 650 C) produce films that nucleate at the Si02 interface, creating a {110} oriented columnar microstructure. At 700 C, the grains are still columnar, but the dominant texture is {100}. Films deposited at temperatures greater than 620 C exhibit compressive stress, and some contain regions of hexagonal silicon. This paper proposes possible causes of the varying stresses, textures, and microstructures in the films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 202: Symposium C – Evolution of Thin Film and Surface Microstructure , 1990 , 167
Copyright
Copyright © Materials Research Society 1991

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References

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