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High-Sensitivity Ion-Selective Field-Effect Transistors Using Nanoporous Silicon

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3 Author(s)
Zehfroosh, N. ; Nano-Electron. Lab., Univ. of Tehran, Tehran, Iran ; Shahmohammadi, Mehran ; Mohajerzadeh, S.

We report the realization of high-sensitivity ion-selective field-effect transistors (ISFETs) using nanoporous polysilicon on the gate region. Owing to the presence of a nanoporous film, the effective area of the exposed surface becomes larger than that of the channel area of a regular transistor. The response of such transistors to pH has been measured for a wide range from four to nine, showing a different behavior from regular ISFETs where a change in the threshold voltage is recorded. A relative current-based sensitivity can be adapted for such devices. A high sensitivity on the order of 300 mV/pH is reported, owing to the presence of 3-D nanostructures.

Published in:

Electron Device Letters, IEEE  (Volume:31 ,  Issue: 9 )