Touch‐Interactive Flexible Sustainable Energy Harvester and Self‐Powered Smart Card

Ferreira, Guilherme; Goswami, S. K.; Nandy, Suman; Pereira, L.; Martins, Rodrigo; Fortunato, Elvira

doi:10.1002/adfm.201908994

Cited by 20 publications

(14 citation statements)

References 46 publications

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“…This work will contribute to the development of active force sensors array for a variety of applications, such as robotics, wearable electronics, and Internet of Things. [ 2 ]…”

Section: Resultsmentioning

confidence: 99%

“…Metal oxides have been widely used for sensing applications [ 1–3 ] and their versatile material properties have enabled new functionalities. [ 4 ] For electromechanical sensors, the recent development of zinc oxide (ZnO) piezoelectric thin film transistors (TFTs) has paved the way to fabricate high‐density force sensor arrays that utilize the TFT as both, a switch and a force sensor.…”

Section: Introductionmentioning

confidence: 99%

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An Analytical Model for Dual Gate Piezoelectrically Sensitive ZnO Thin Film Transistors

Dayeh

2021

Adv Materials Technologies

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Highly sensitive force sensors of piezoelectric zinc oxide (ZnO) dual‐gate thin film transistors (TFTs) are reported together with an analytical model that elucidates the physical origins of their response. The dual‐gate TFTs are fabricated on a polyimide substrate and exhibited a field effect mobility of ≈5 cm2 V−1 s−1, Imax/Imin ratio of 107, and a subthreshold slope of 700 mV dec−1, and demonstrated static and transient current changes under external forces with varying amplitude and polarity in different gate bias regimes. To understand the current modulation of the dual‐gate TFT with independently biased top and bottom gates, an analytical model is developed. The model includes accumulation channels at both surfaces and a bulk channel within the film and accounts for the force‐induced piezoelectric charge density. The microscopic piezoelectric response that modulates the energy‐band edges and correspondent current–voltage characteristics are accurately portrayed by this model. Finally, the field‐tunable force response in single TFT is demonstrated as a function of independent bias for the top and bottom gates with a force response range from −0.29 to 22.7 nA mN−1. This work utilizes intuitive analytical models to shed light on the correlation between the material properties with the force response in piezoelectric TFTs.

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“…This work will contribute to the development of active force sensors array for a variety of applications, such as robotics, wearable electronics, and Internet of Things. [ 2 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Analytical Model for Dual Gate Piezoelectrically Sensitive ZnO Thin Film Transistors

Dayeh

2021

Adv Materials Technologies

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“…Meanwhile, an interesting application of the self‐powered touch sensor is able to light up some diodes, supply power to electronic devices, or charge capacitors. This paper-based energy harvester (~ 120 µm thick) is screen-printed using a mesh (carbons/silvers) [ 74 ]. Especially, 3D printing technology is attracting a great deal of attention in recent researches with a high commercialization ability as the large-scale and relative ease of integration.…”

Section: Manufacturing Technologiesmentioning

confidence: 99%

Flexible wearable sensors - an update in view of touch-sensing

Kim

2021

Science and Technology of Advanced Materials

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Nowadays, much of user interface is based on touch and the touch sensors have been common for displays, Internet of things (IoT) projects, or robotics. They can be found in lamps, touch screens of smartphones, or other wide arrays of applications as well. However, the conventional touch sensors, fabricated from rigid materials, are bulky, inflexible, hard, and hard-to-wear devices. The current IoT trend has made these touch sensors increasingly important when it added in the skin or clothing to affect different aspects of human life flexibly and comfortably. The paper provides an overview of the recent developments in this field. We discuss exciting advances in materials, fabrications, enhancements, and applications of flexible wearable sensors under view of touch-sensing. Therein, the review describes the theoretical principles of touch sensors, including resistive, capacitive, and piezoelectric types. Following that, the conventional and novel materials, as well as manufacturing technologies of flexible sensors are considered to. Especially, this review highlights the multidisciplinary approaches such as e -skins, e -textiles, e -healthcare, and e -control of flexible touch sensors. Finally, we summarize the challenges and opportunities that use is key to widespread development and adoption for future research.

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“…In general, lithography-based silicon technologies face a cost barrier for many envisioned applications and devices in the scope of the IoT. Furthermore, with the ever-increasing demand in electronic devices for the IoT, electronic waste (e-waste), that presents a substantial ecological problem up to now 26 – 28 , is even expected to increase 27 , 28 .…”

Section: Introductionmentioning

confidence: 99%

Hybrid low-voltage physical unclonable function based on inkjet-printed metal-oxide transistors

et al. 2020

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Modern society is striving for digital connectivity that demands information security. As an emerging technology, printed electronics is a key enabler for novel device types with free form factors, customizability, and the potential for large-area fabrication while being seamlessly integrated into our everyday environment. At present, information security is mainly based on software algorithms that use pseudo random numbers. In this regard, hardware-intrinsic security primitives, such as physical unclonable functions, are very promising to provide inherent security features comparable to biometrical data. Device-specific, random intrinsic variations are exploited to generate unique secure identifiers. Here, we introduce a hybrid physical unclonable function, combining silicon and printed electronics technologies, based on metal oxide thin film devices. Our system exploits the inherent randomness of printed materials due to surface roughness, film morphology and the resulting electrical characteristics. The security primitive provides high intrinsic variation, is non-volatile, scalable and exhibits nearly ideal uniqueness.

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Touch‐Interactive Flexible Sustainable Energy Harvester and Self‐Powered Smart Card

Cited by 20 publications

References 46 publications

An Analytical Model for Dual Gate Piezoelectrically Sensitive ZnO Thin Film Transistors

An Analytical Model for Dual Gate Piezoelectrically Sensitive ZnO Thin Film Transistors

Flexible wearable sensors - an update in view of touch-sensing

Hybrid low-voltage physical unclonable function based on inkjet-printed metal-oxide transistors

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