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Piezoresistive Properties of Boron-Doped PECVD Microcrystalline Silicon Films

Published online by Cambridge University Press:  22 February 2011

Shu Wen Guo ,
Song Sheng Tan  and
Wei Yuan Wang
Shu Wen Guo
Affiliation:
Laboratory of Transducer Technology, Shanghai Institute of Metallurgy, Academia Sinica 865 Chang Ning Road, Shanghai 200050, China
Song Sheng Tan
Affiliation:
Laboratory of Transducer Technology, Shanghai Institute of Metallurgy, Academia Sinica 865 Chang Ning Road, Shanghai 200050, China
Wei Yuan Wang
Affiliation:
Laboratory of Transducer Technology, Shanghai Institute of Metallurgy, Academia Sinica 865 Chang Ning Road, Shanghai 200050, China
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Abstract

The piezoresistive properties of boron-doped PECVD microcrystalline Si films (μc-Si) deposited on SiO2 coated Si, covar or quartz substrates have been investigated. The relations between the gauge factor (G.F.) and doping concentrations as well as the film thickness etc. have been obtained experimentally. The maximum longitudinal G.F. of 25 and 20 are measured for Si and covar substrates respectively. An expression for calculating G.F. of P-type μc-Si is derived theoretically by use of the splitting model of heavy and light hole band at k=0 and the thermionic emission theory. The calculated dependences of G.F. on the doping concentrations, grain size and trap state density agree well with the experimental results, which offer a better understanding of the piezoresistive characteristics of μc-Si or poly-Si, and enable optimized design and fabrication of μc-Si or poly-Si strain gauges.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 106: Symposium G – Polysilicon Films and Interfaces , 1987 , 231
Copyright
Copyright © Materials Research Society 1988

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References

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