General Information
    • ISSN: 2010-0221
    • Frequency: Bimonthly
    • DOI: 10.18178/IJCEA
    • Editor-in-Chief: Prof. Dr. Shen-Ming Chen
    • Executive Editor: Mr. Ron C. Wu
    • Abstracting/ Indexing: Chemical Abstracts Services (CAS), Ulrich's Periodicals Directory, CABI, DOAJ, Electronic Journals Library, Google Scholar, ProQuest, and Crossref
    • E-mail: ijcea@ejournal.net
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Editor-in-chief
Prof. Dr. Shen-Ming Chen
National Taipei University of Technology, Taiwan
 

IJCEA 2015 Vol.6(5): 346-351 ISSN: 2010-0221
DOI: 10.7763/IJCEA.2015.V6.507

ISFET pH-Sensor Sensitivity Extraction Using Conventional MOSFET Simulation Tools

Tarek M. Abdolkader, Abdurrahman G. Alahdal, Ahmed Shaker, and Wael Fikry
Abstract—The Ion-Sensitive Field-Effect Transistor (ISFET) has traditionally been used to measure hydrogen ion concentration (pH) of a solution. Its performance depends mainly on its sensitivity to pH change of the electrolyte in contact with its gate. This sensitivity is usually calculated by examining the effect of pH value on the charge and potential distributions above gate insulator, which is translated into a shift in the threshold voltage. In this work, we propose a methodology to extract the sensitivity of ISFET by linking electrolyte charge and potential equations with a device simulation tool to calculate the ISFET’s drain current, thus, taking into account the underlying structure’s physical properties. Using the proposed methodology, the sensitivity of ISFET is compared for various pH values and gate-insulator thicknesses searching for the optimum conditions that give the highest sensitivity.

Index Terms—ISFET, pH-sensor, biosensors, device simulation.

Tarek M. Abdolkader and A. G. Alahdal are with the Electrical Engineering Department, Faculty of Engineering, Umm Al-Qura University, Saudi Arabia, on leave from Benha University, Benha, Egypt (e-mail: tmhasan@ uqu.edu.sa, agahdal@uqu.edu.sa).
A. Shaker and W. Fikry are with the Engineering Physics Department, Ain Shams University, Egypt (email: ashaker2k@yahoo.com, waelfikry@yahoo.com).

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Cite: Tarek M. Abdolkader, Abdurrahman G. Alahdal, Ahmed Shaker, and Wael Fikry, "ISFET pH-Sensor Sensitivity Extraction Using Conventional MOSFET Simulation Tools," International Journal of Chemical Engineering and Applications vol. 6, no. 5, pp. 346-351, 2015.

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