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Modeling of Polysilicon Resistors, P-N Junction Diodes and Mosfet's

Published online by Cambridge University Press:  21 February 2011

A. N. Khondker
Affiliation:
Department of Electrical and Computer Engineering, Clarkson College, Potsdam, New York 13676;
S. S. Ahmed
Affiliation:
Department of Electrical Engineering, Rice University, P.O. Box 1892, Houston, Texas 77251
T. Liou
Affiliation:
Department of Electrical and Computer Engineering, Clarkson College, Potsdam, New York 13676;
D. M. Kim
Affiliation:
Department of Electrical Engineering, Rice University, P.O. Box 1892, Houston, Texas 77251
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Abstract

Conductivity in bulk polysilicon is discussed, applicable over a wide range of dopant concentration, temperature, grain size and trap density. The I-V behavior in a lateral poly p-n junction is analytically modeled, incorporating the effects of carrier lifetime operative in crystalline grain and amorphous conducting boundary. In particular, the extremely short carrier lifetime within the grain boundary is shown to provide an ohmic conduction channel in a direction parallel to current flow. This ohmic current can account for the unusually high current levels observed at small applied voltages. Also, the shift of the threshold voltage of MOS devices, as influenced by grain traps near the channel region, is analysed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1984

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References

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