A New Foundry-Based Open-Gate Junction Field-Effect Transistor (OG-JFET) as Electronic Sensing Platform (ESP) for Life Science Applications

Panahi, Abbas; Tabrizi, Hamed Osouli; Mangannavar, Priyadarshini; Chebotarev, Oleg; Fung, A. W. P.; Ghafar-Zadeh, Ebrahim

doi:10.1109/sensors47087.2021.9639830

Cited by 3 publications

(3 citation statements)

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“…[ 75 ] for NO 2 detection using a similar JFET structure. However, the charge density was determined using the simulation modeling of pH equivalent surface charge we introduced in our previous work [ 72 ]. Same as the experiment and multiphysics simulation, the mathematical model shows current enhancement with an increase in pH ( Figure 15 ).…”

Section: Resultsmentioning

confidence: 99%

“…The current sensing platform is similar to the well-established JFET, with the subtle difference that the top gate of a JFET is removed to open the space for introducing a solution. Physically, the structure is based on a p-type JFET without the top n-type gate, as we reported in our previous works [ 70 , 71 , 72 ]. Therefore, the structure only has a back gate that can control the conduction channel.…”

Section: Electronic Sensormentioning

confidence: 99%

“…The sensor is provided through a standard microfabrication process, which further helps to establish this sensor as a mass-producible platform for industrial applications (for more information about fabrications, we invite the reader to read Refs. [ 70 , 71 , 72 ]). The platform includes a PDMS channel integrated with the OG-JFET sensor to deliver samples on the sensing area.…”

Section: Electronic Sensormentioning

confidence: 99%

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A Hybrid Microfluidic Electronic Sensing Platform for Life Science Applications

Panahi

Ghafar-Zadeh

2022

Micromachines

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This paper presents a novel hybrid microfluidic electronic sensing platform, featuring an electronic sensor incorporated with a microfluidic structure for life science applications. This sensor with a large sensing area of 0.7 mm2 is implemented through a foundry process called Open-Gate Junction FET (OG-JFET). The proposed OG-JFET sensor with a back gate enables the charge by directly introducing the biological and chemical samples on the top of the device. This paper puts forward the design and implementation of a PDMS microfluidic structure integrated with an OG-JFET chip to direct the samples toward the sensing site. At the same time, the sensor’s gain is controlled with a back gate electrical voltage. Herein, we demonstrate and discuss the functionality and applicability of the proposed sensing platform using a chemical solution with different pH values. Additionally, we introduce a mathematical model to describe the charge sensitivity of the OG-JFET sensor. Based on the results, the maximum value of transconductance gain of the sensor is ~1 mA/V at Vgs = 0, which is decreased to ~0.42 mA/V at Vgs = 1, all in Vds = 5. Furthermore, the variation of the back-gate voltage from 1.0 V to 0.0 V increases the sensitivity from ~40 mV/pH to ~55 mV/pH. As per the experimental and simulation results and discussions in this paper, the proposed hybrid microfluidic OG-JFET sensor is a reliable and high-precision measurement platform for various life science and industrial applications.

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Section: Resultsmentioning

confidence: 99%