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Related Concept Videos

Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
Field Effect Transistor01:29

Field Effect Transistor

Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...
Biasing of FET01:22

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Related Experiment Video

Updated: May 22, 2026

In Vitro Multiparametric Cellular Analysis by Micro Organic Charge-modulated Field-effect Transistor Arrays
10:05

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Published on: September 20, 2021

Optimization of a PVC Membrane for Reference Field Effect Transistors.

Chao-Sung Lai1, Cheng-En Lue, Chia-Ming Yang

  • 1Department of Electronic Engineering in Chang Gung University. / 259 Wen-Hwa 1 Road, Kwei-Shan, Tao-Yuan, R.O.C., Taiwan, 333.

Sensors (Basel, Switzerland)
|May 11, 2012
PubMed
Summary

Researchers developed a novel quasi reference field-effect transistor (REFET) to replace conventional electrodes in miniaturized ISFET systems. The optimized REFET demonstrated low ion sensitivity and high linearity, achieving a 15-day lifespan.

Keywords:
PVC membranesREFET, silylatingion-unblocking membranesplasticizers

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Area of Science:

  • Electrochemistry
  • Chemical Sensors
  • Materials Science

Background:

  • Miniaturization of Ion-Selective Field-Effect Transistor (ISFET) sensing systems requires advanced reference electrodes.
  • Conventional reference electrodes present challenges for miniaturization and integration.

Purpose of the Study:

  • To propose and optimize a quasi reference field-effect transistor (REFET) as a miniaturized alternative to conventional reference electrodes.
  • To investigate the impact of material composition and fabrication processes on REFET performance.

Main Methods:

  • Fabrication of REFETs utilizing an ion-unblocking membrane as the top layer.
  • Optimization of REFET performance by investigating silylating processes, plasticizers, and PVC cocktail compositions.
  • Evaluation of REFETs using differential readout circuits and analysis of sensitivity, linearity, and drift.

Main Results:

  • A REFET with a 60 wt.% DNP/(DNP + PVC) membrane achieved low ion sensitivity (10.4 ± 2.2 mV/pH) and high linearity (99.7 ± 0.3 %) across a wide pH range (2.2–11.6).
  • The optimized REFET exhibited a low drift coefficient of -0.74 mV/h.
  • The best-performing REFET demonstrated a lifespan of approximately 15 days based on defined criteria for sensitivity and linearity degradation.

Conclusions:

  • The developed REFET shows significant promise for miniaturized ISFET sensing systems.
  • Optimization of membrane composition is crucial for achieving stable and reliable reference electrode performance.
  • The REFET offers a viable, low-ion-sensitivity alternative to traditional reference electrodes in microelectronic systems.