Enhanced Flexible Piezoelectric Sensor by the Integration of P(VDF-TrFE)/AgNWs Film With a-IGZO TFT

Zhang, Zhihan; Chen, Longlong; Yang, Xiang; Li, Tongkuai; Zhao, Tingting

doi:10.1109/led.2018.2881983

Cited by 23 publications

(15 citation statements)

References 19 publications

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“…Figure d and Figure S2, Supporting Information, show the simulation results of the voltage gain and the transient response of the amplifier as a function of T 4 resistance, respectively. Within the resistance range of 1–10 MΩ for T 4 , it is clear that higher voltage gain and fast operation are achieved with high‐resistance of T 4 . For instance, the gain increased from 10.6 to 56.5 V V −1 when the resistance was changed from 1 to 10 MΩ.…”

Section: Resultsmentioning

confidence: 94%

“…Within the resistance range of 1-10 MΩ for T 4 , it is clear that higher voltage gain and fast operation are achieved with high-resistance of T 4 . [30,31] For instance, the gain increased from 10.6 to 56.5 V V −1 when the resistance was changed from 1 to 10 MΩ. In this perspective, although the n-type a-IGZO TFTs may exhibit high field-effect mobility, their low resistance could limit the amplifier performance particularly when it is used as the load transistor.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Ultra‐Flexible Solution‐Processed Metal‐Oxide/Carbon Nanotube Complementary Circuit Amplifier with Highly Reliable Electrical and Mechanical Stability

Kim

Kang

Heo

et al. 2019

Adv Elect Materials

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Here, high‐performance flexible complementary metal‐oxide–semiconductor (CMOS) amplifiers with extremely stable electro‐mechanical characteristics by employing low‐temperature solution‐processed amorphous indium–gallium–zinc oxide (a‐IGZO) and single‐walled carbon nanotube (SWCNT) thin film transistors (TFTs) is demonstrated. The photochemical‐activated combustion sol–gel a‐IGZO and SWCNT TFTs show average saturation mobility of 6.82 and 0.51 cm2 V−1 s−1, respectively. Based on the devices, a‐IGZO/SWCNT‐based CMOS amplifiers are implemented on ultrathin and flexible substrates (thickness of ≈3 µm), exhibiting small‐signal gain and unity‐gain bandwidth of up to 25 dB and 25 kHz, respectively, with highly reliable characteristics from 1000 bending stress (radius of 125 µm) and positive gate bias stress conditions (for up to 3 h). The underlying mechanisms of the CMOS performance combined with large output impedance of the SWCNT load are investigated in detail via various circuit implementations and automatic integrated circuit modeling Spice simulation and comprehensive electrical analysis. To ensure the viability of the extremely stable electromechanical properties of the flexible amplifier, a numerical analysis is carried out based on finite‐element methods with an integrated circuit emphasis to find the best match of the CMOS architecture and optimized structural integrity, verifying highly reliable and scalable skin‐like electronics.

show abstract

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

An Ultra‐Flexible Solution‐Processed Metal‐Oxide/Carbon Nanotube Complementary Circuit Amplifier with Highly Reliable Electrical and Mechanical Stability

Kim

Kang

Heo

et al. 2019

Adv Elect Materials

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show abstract

“…The various approaches in fabricating pressure sensors include resistive types [7,21,39,70,95,104,127,136,208,296,[413][414][415][416][417][418][419][420][421][422][423], capacitive types [25,71,146,303,310,321,352,[424][425][426][427], field-effect transistors [9][10][11]193,428], and the piezocapacitive and piezoelectric properties of materials [214,[429][430][431]. Pressure sensors' most important parameters are sensitivity, detection range and response time.…”

Section: Pressure Sensorsmentioning

confidence: 99%

“…The piezoelectricity of functionalised organic materials has been explored through a AgNW functionalised P(VDF-TrFE) piezocapacitor built on top of an a-IGZO TFT on a PI substrate [430]. The doping of P(VDF-TrFE) with AgNWs improved the material's piezoelectric performance.…”

Section: Piezocapacitive and Piezoelectric Pressure Sensorsmentioning

confidence: 99%

Flexible Sensors—From Materials to Applications

et al. 2019

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Flexible sensors have the potential to be seamlessly applied to soft and irregularly shaped surfaces such as the human skin or textile fabrics. This benefits conformability dependant applications including smart tattoos, artificial skins and soft robotics. Consequently, materials and structures for innovative flexible sensors, as well as their integration into systems, continue to be in the spotlight of research. This review outlines the current state of flexible sensor technologies and the impact of material developments on this field. Special attention is given to strain, temperature, chemical, light and electropotential sensors, as well as their respective applications.

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“…[ 3 ] Among them, soft strain sensors can detect the movement of hands and limbs, [ 4 ] blood pulse, [ 5 ] and respiration rate, [ 6 ] indicating the vital signs of the human body. These sensors work with different sensing mechanisms [ 7 ] e.g., piezo‐resistivity, [ 4b ] capacitance, [ 8 ] and piezo‐electricity [ 9 ] would transduce the strain, pressure, force and vibration into electrical signal.…”

Section: Introductionmentioning

confidence: 99%

Highly Filled Glycerol/Graphite Suspensions as Fluidic Soft Sensors and Their Responsive Mechanism to Shear

Zhou

Guo

2020

Adv Materials Technologies

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The conductive suspensions composed of high content of graphite flakes dispersed in glycerol demonstrate flow field sensitive resistance and memory effect of the deformation history, which are expected to work as new fluidic soft sensors. The resistance of the suspensions responds to the local flow field caused by vibrations, stretching, and shear. The combined electro‐rheo tests are carried out to reveal the resistance response to different types of flow field. Based on the variations of resistance, a microstructural model considering the direction of the flow field and the corresponding transition kinetics of the different microstructures of fillers are established in the present work. The contents of the microstructures vary with both the shear strain and the shear direction and the transition rate between the different microstructures depended on the shear rate. The unveiled mechanism via the proposed model is expected to deepen the understanding of conductive suspensions so as to further guide the design of soft sensors based on conductive suspensions and composites.

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Enhanced Flexible Piezoelectric Sensor by the Integration of P(VDF-TrFE)/AgNWs Film With a-IGZO TFT

Cited by 23 publications

References 19 publications

An Ultra‐Flexible Solution‐Processed Metal‐Oxide/Carbon Nanotube Complementary Circuit Amplifier with Highly Reliable Electrical and Mechanical Stability

An Ultra‐Flexible Solution‐Processed Metal‐Oxide/Carbon Nanotube Complementary Circuit Amplifier with Highly Reliable Electrical and Mechanical Stability

Flexible Sensors—From Materials to Applications

Highly Filled Glycerol/Graphite Suspensions as Fluidic Soft Sensors and Their Responsive Mechanism to Shear

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