Organic field effect transistors (OFETs) in environmental sensing and health monitoring: A review

Abstract

Organic field effect transistors (OFETs) have been the focus of sensing application research over the last two decades. In comparison to their inorganic counterparts, OFETs have multiple advantages, such as low-cost manufacturing, large area coverage, flexibility and readily tunable electronic material properties. To date, various organic semiconductors (OSCs), both polymers and small molecules, have been extensively researched for the purpose of developing the active channel layers in OFETs, enhancing their sensitivity and selectivity. However, OFET devices still need to be optimized to demonstrate reliable performance at the device level and in sensing applications. This review begins with an introduction of the OFETs with an emphasis on their geometry, materials (OSCs), fabrication process, and data analysis. After this, multiple applications are discussed and the progress regarding sensing elements and precisions is highlighted. In the end, the challenges and possible future directions of OFET arrays in embedded sensing platforms are presented.

Synthesis and Characterization of a 2,3-Dialkoxynaphthalene-Based Conjugated Copolymer via Direct Arylation Polymerization (DAP) for Organic Electronics

“…Conjugated polymers with alternating electron-donor and electron-acceptor units along their backbones (D−A CPs) have been investigated during the last decades for a variety of applications in organic electronics, such as organic photovoltaic (OPV) devices [1][2][3], organic light-emitting diodes (OLEDs) [4,5], organic field-effect transistors (OFETs) [6,7], polymer-based organic batteries [8,9], and chemical sensors [10,11]. CPs are typically prepared by versatile and reliable cross-coupling reactions, such as Suzuki-Miyaura, Migita-Stille, and Kumada-Corriu, among others, which tend to give high reactivity, high molecular-weight, and well-defined polymers.…”

“…All reaction mixture was recovered from the acetone fraction 5. Insoluble material was left in the Soxhlet thimble after extraction with chloroform 6. In chloroform dilute solution.…”

A Study on the Stability of Water-Gated Organic Field-Effect-Transistors Based on a Commercial p-Type Polymer

“…The use of organic field-effect-transistors (OFETs) as sensors (Torsi et al, 2013; Li et al, 2018; Surya et al, 2019) has received a tremendous boost in the last decades thanks to the advent of low-cost fabrication strategies as well as of flexible and/or stretchable substrates (Kim et al, 2013; Manoli et al, 2015). However, their exploitation and commercialization as real-life sensors have been limited by the organic polymer degradation occurring when the device is operated in aqueous environments (Knopfmacher et al, 2014; Wang et al, 2016; Zhang et al, 2016).…”

Effects of Solvent Vapor Annealing on Morphology and Charge Transport of Poly(3-hexylthiophene) (P3HT) Films Incorporated with Preformed P3HT Nanowires

“…In recent years, solution-processible conjugated polymers have garnered a great deal of attention for the practical printing of organic field-effect transistors (OFETs), organic photovoltaics, and interface materials due to their low cost and large-area processability [1][2][3][4][5][6]. Typically, they have been utilized and studied as active materials for OFETs because of their semiconducting properties, arising from the extended π-conjugation of unhybridized P z carbon orbitals along the backbone [7].…”