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Impedance model of electrolyte-insulator-semiconductor structure with porous silicon semiconductor

DSpace at IIT Bombay

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Title Impedance model of electrolyte-insulator-semiconductor structure with porous silicon semiconductor
 
Creator BETTY, CA
LAL, R
YAKHMI, JV
 
Subject spectroscopy
fabrication
sensors
surface
porous silicon
impedance model
conductance
capacitance
photoelectrode
porous silicon-polyaniline structure
porous silicon-nitrided tio(2) structure
 
Description We present a generic impedance model for the porous silicon|electrolyte structure that is valid for a range of interfacial layers and bias in these structures. The model is validated using three widely different porous structures: short irregular silicon columns and pores, long cylindrical silicon columns and pores; and branched interconnected silicon microchannels and voids in a mesh structure. The model incorporates appropriate RC or constant phase elements for the different parts of the porous structure, namely, the top of the silicon columns (channels)|electrolyte, the column (channel) walls|electrolyte in the pores/channels, and the electrolyte|semiconductor interface at the base of the pores/channels. This physical model underscores the effects of column/channel depletion and accumulation, either due to applied bias or change of surface charge, to the impedance spectra of the device. The model helps to explain why the porosity needs to be optimized for specific applications and helps as a measurement tool for optimization. (C) 2009
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-25T07:38:35Z
2011-12-26T12:56:58Z
2011-12-27T05:46:36Z
2011-08-25T07:38:35Z
2011-12-26T12:56:58Z
2011-12-27T05:46:36Z
2009
 
Type Article
 
Identifier ELECTROCHIMICA ACTA, 54(14), 3781-3787
0013-4686
http://dx.doi.org/10.1016/j.electacta.2009.01.071
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10941
http://hdl.handle.net/10054/10941
 
Language en