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Rapid Detection of COVID-19 Using FET and MOSFET Biosensors
Published in Suman Lata Tripathi, Kanav Dhir, Deepika Ghai, Shashikant Patil, Health Informatics and Technological Solutions for Coronavirus (COVID-19), 2021
The organic field-effect transistor (OFET) is an undifferentiated form of TFT (thin film transistor) in which an active material organic semiconductor (OSC) is used. It may be of P-type or N-type transistor relying upon substantial determination. Unique in relation to MOSFET, OFET has a place with the family of TFT, which works in accumulation mode [29] which implies that supplied gate voltage restricts the current in the channel in an immediate way. The mobility of OFET commonly lies in the range of 10−1 to 10−2 cm2 V/s, which is significantly lower than the mobility of Si. This distinction begins from OSC’s substantial structure; for example, noncovalent bonds and π-bonds are the principle bearer progress pathways which result in more awful mobility. Regardless of this downside, OSC is exceptionally perfect for adaptable substrate. The plausibility of acknowledging adaptable and electronic wearable gadgets attracts researchers’ considerations on organic FET as of late. Like ISFET, OFET can be changed from customary transistor to biosensing transistor. By inundating the organic FET in an electrolyte domain, the structure of electric double layer (EDL) shows up right away. In this manner, it can control the gadget by including an electrode reference as absolution gate anode. An arrangement of organic FET biosensor (e.g., EGOFET or OFET with electrolyte gate) is appeared in Figure 17.3.
Conjugated Polymer- Based OFET Devices
Published in John R. Reynolds, Barry C. Thompson, Terje A. Skotheim, Conjugated Polymers, 2019
Mark Nikolka, Henning Sirringhaus
The recent advancements in the performance of conjugated polymer OFET technology are now allowing it to target more mainstream markets such as high-resolution video rate LCD and OLED displays. For instance, by now the ability to reliably achieve performances above those of amorphous silicon (a-Si) renders polymer OFETs as an attractive alternative to a-Si in state-of-the-art LCD backplane displays. The opportunity to process light weight displays on flexible foil gives OFET driven LCDs an edge over its traditional competitor. The UK based company FlexEnable, which was spun-out of Plastic Logic, has developed and demonstrated a flexible OFET-LCD platform that in price, reliability and yield is comparable to standard amorphous-LCD technology. This offers OFET technology an attractive entry into the large-scale display market12 and enables flexible, light-weight, unbreakable colour and video displays for applications in automotives or consumer electronics.
Molecular Semiconductors for Organic Field-Effect Transistors
Published in Sam-Shajing Sun, Larry R. Dalton, Introduction to Organic Electronic and Optoelectronic Materials and Devices, 2016
On increasing the magnitudes of VSD and VSG, a linear current regime (Equation 10.1) is initially observed at low drain voltages (VSD < VSG), followed by a saturation regime (Equation 10.2) when the drain voltage exceeds the gate voltage. Note that organic FETs normally operate in the accumulation mode, where the increase in the magnitude of VSG enhances channel conductivity, in contrast to conventional inorganic transistors. Figure 10.2 collects examples of OFETs I–V plots from which the carrier mobility can be calculated. The output plot is obtained by plotting ISD versus VSD and the transfer plot is obtained when ISD is plotted against VSG. From the latter plot the device current on:off ratios (Ion:Ioff) can be easily calculated, which represent the parameters describing how efficiently the FET operates as an electronic valve. Other important OFET parameters are the threshold voltage (VT) and the subthreshold swing (S).
Building memory devices from biocomposite electronic materials
Published in Science and Technology of Advanced Materials, 2020
Xuechao Xing, Meng Chen, Yue Gong, Ziyu Lv, Su-Ting Han, Ye Zhou
FET was initially put forward by J.E. Lilienfeld, who got a patent due to his idea in 1930. He proposed that a FET behaves as a capacitor with a conductive channel between source electrode and drain electrode. The applied voltage on the gate electrode controls the amount of charge carriers flowing through the conductive channel. The first FET was prepared and fabricated by Kahng and Atalla in 1960 using metal-oxide semiconductors (MOSFETs) [65–73]. In recent years, rising materials and manufacturing costs and public interest in more environmentally friendly electronic materials have supported the rapid development of organic electronics [74–76]. The emergence of the first polythiophene-based FET in 1986 has aroused widespread interest in organic field effect transistors (OFET). In just 30 years, this field has made rapid progress. OFET has potential and extensive applications in many fields such as OLEDs, organic light detectors, organic solar cells, sensors, organic data storage devices, and flexible flat panel displays due to its large-area fabrication ability [2].
Self-assembled molecular devices: a minireview
Published in Instrumentation Science & Technology, 2020
The key parameters of the self-assembled molecular field effect transistor are field effect mobility and switch ratio. As a low-cost transistor technology suitable for large-area electronic applications, the organic field effect transistors (OFET) have attracted wide attention. The use of SiO2 on highly doped and conductive silicon wafers as grid dielectrics for insulating materials has been a hot topic in research on OFETs.[24,25] In addition to surface modification of insulating gate materials, the performance can also be improved by changing P-channel materials and N-channel materials.[26–30] The bipolar OFET has the function of electron hole balance and electronic transmission, which is an ideal choice for realizing complementary inverters.