Printed pressure sensor matrix with organic field-effect transistors

Hassinen, Tomi; Eiroma, Kim; Mäkelä, Tapio; Ermolov, Vladimir

doi:10.1016/j.sna.2015.11.007

Cited by 24 publications

(15 citation statements)

References 30 publications

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“…The high sensitivity and low‐voltage operation of our flexible OTFT sensors using the novel PAA:PEG dielectric are much better than those of the devices in previous reports . We summarized some representative works on OTFT‐based pressure sensors and compared our results with them (as shown in Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 96%

“…To date, considerable efforts have been made to fabricate OTFT‐based pressure sensors by designing dielectric/electrode materials, using new semiconductors, and optimizing device structures . With a lamination technique, microstructured polydimethylsiloxane (PDMS) was integrated into OTFTs as a dielectric, resulting in active pressure sensors with high sensitivity and fast response .…”

Section: Introductionmentioning

confidence: 99%

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Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing

Liu

Yin

Wang

et al. 2018

Adv Funct Materials

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Organic thin-film transistors (OTFTs) can provide an effective platform to develop flexible pressure sensors in wearable electronics due to their good signal amplification function. However, it is particularly difficult to realize OTFT-based pressure sensors with both low-voltage operation and high sensitivity. Here, controllable polyelectrolyte composites based on poly(ethylene glycol) (PEG) and polyacrylic acid (PAA) are developed as a type of highcapacitance dielectrics for flexible OTFTs and ultrasensitive pressure sensors with sub-1 V operation. Flexible OTFTs using the PAA:PEG dielectrics show good universality and greatly enhanced electrical performance under a much smaller operating voltage of −0.7 V than those with a pristine PAA dielectric. The low-voltage OTFTs also exhibit excellent flexibility and bending stability under various bending radii and long cycles. Flexible OTFT-based pressure sensors with low-voltage operation and superhigh sensitivity are demonstrated by using a suspended semiconductor/dielectric/gate structure in combination with the PAA:PEG dielectric. The sensors deliver a record high sensitivity of 452.7 kPa −1 under a low-voltage of −0.7 V, and excellent operating stability over 5000 cycles. The OTFT sensors can be built into a wearable sensor array for spatial pressure mapping, which shows a bright potential in flexible electronics such as wearable devices and smart skins.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing

Liu

Yin

Wang

et al. 2018

Adv Funct Materials

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“…In general, methods for preparing hazy transparent films can be classified into two types: the particle-diffusing type, which relies on the transparent particles inside the transparent films to scatter light, and the surface-relief type, which relies on microstructures on the surface of the transparent films to scatter light [4,5]. For the particle-diffusing type, transparent SiO 2 and TiO 2 nanoparticles and silver nanowires have been utilized for hazy transparent film fabrication due to the difference in the refractive coefficient between transparent substrates and inorganic nanoparticles [6,7]. For the surface-relief type, polydimethylsiloxane (PDMS) replica molding [8], the silver halide sensitized gelatin method [9], holographic recording [10], the 3D diffuser lithograph [11], photofabrication [12], hot embossing [13], and roller extrusion [4] have been developed to replicate the microstructures onto the surface of plastic films.…”

Section: Introductionmentioning

confidence: 99%

Manufacture of Highly Transparent and Hazy Cellulose Nanofibril Films via Coating TEMPO-Oxidized Wood Fibers

Yang

Liu

2019

Nanomaterials

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Traditionally, inorganic nanoparticles (SiO2, TiO2) have been utilized to tune the optical haze of optoelectronic devices. However, restricted to complex and costly processes for incorporating these nanoparticles, a simple and low-cost approach becomes particularly important. In this work, a simple, effective, and low-cost method was proposed to improve optical haze of transparent cellulose nanofibril films by directly depositing micro-sized 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized wood fibers (“coating” method). The obtained films had a high total transmittance of 85% and a high haze of 62%. The film samples also showed a high tensile strength of 80 MPa and excellent thermal stability. Dual sides of the obtained films had different microstructures: one side was extremely smooth (root-mean-square roughness of 6.25 nm), and the other was extremely rough (root-mean-square roughness of 918 nm). As a reference, micro-sized TEMPO-oxidized wood fibers and cellulose nanofibrils were mixed to form a transparent and hazy film (“blending” method). These results show that hazy transparent films prepared using the “coating” method exhibit superior application performances than films prepared using the “blending” method.

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“…According to Hassinen et al, the protective layer also diminishes the threshold voltage drift in the presence of an air gap. [ 81 ]…”

Section: Mechanical Sensorsmentioning

confidence: 99%

Organic Thin Film Transistors in Mechanical Sensors

Lamport

Cavallari

Kam

et al. 2020

Adv Funct Materials

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The marriage of organic thin‐film transistors (OTFTs) and flexible mechanical sensors has enabled previously restricted applications to become a reality. Counterintuitively, the addition of an OTFT at each sensing element can reduce the overall complexity so that large‐area, low‐noise sensors can be fabricated. The best‐performing instance of this is the active matrix, used in display applications for many of the same reasons, and nearly any type of flexible mechanical sensor can be incorporated into these structures. In this Progress Report, some of the flexible sensor devices that have taken advantage of these mechanical properties are highlighted, examining the advantages that OTFTs offer in the hybrid integration of local amplification and switching. In particular, the current research on resistive pressure sensors, capacitive pressure sensors, resistive or piezoresistive strain sensors, and piezoelectric sensors is identified and enumerated.

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Printed pressure sensor matrix with organic field-effect transistors

Cited by 24 publications

References 30 publications

Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing

Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing

Manufacture of Highly Transparent and Hazy Cellulose Nanofibril Films via Coating TEMPO-Oxidized Wood Fibers

Organic Thin Film Transistors in Mechanical Sensors

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