A normally off time-of-event logging system triggered by a battery-less sensor

Yamada, S.; Toshiyoshi, Hiroshi

doi:10.1016/j.sna.2023.114306

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…In addition to the battery performance, further integration with electrical circuits is beneficial for compensating for their low capacities and reducing the power consumption of logic, radio frequency circuits, and sensors. The intermittent operation of sensor modules is promising to achieve a long lifetime of energy storage using timers or event‐driven triggers using battery‐less sensors [ 69 ] to wake up modules in the sleep mode. For rechargeable energy storage, including supercapacitors, pseudocapacitors, and secondary batteries, energy harvesting [ 70 ] is an option to expand their capacity.…”

Section: Discussionmentioning

confidence: 99%

Recent Progress in Transient Energy Storage using Biodegradable Materials

Yamada

2023

Adv Energy and Sustain Res

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With the development of wireless sensor networks, electrical waste that remains in the environment is an inevitable issue in achieving sustainability and progress in electronics. Transient electronics that disappear after a prescribed time are of interest in electronics and material sciences. Such devices comprise naturally sourced materials that degrade without harmful or toxic substances during biodegradation. Although there are reports on transient electronic devices, including transistors, sensors, and radio frequency circuits, insufficient research has been conducted on the energy storage essential for operating transient devices. This review highlights the recent progress in developing transient energy storage. First, materials for transient energy storage, including conductors, electrolytes, and gels, are introduced. Second, transient supercapacitors, pseudocapacitors, primary batteries, and secondary batteries, are described and summarized. Finally, this review concludes and discusses the prospect of transient energy storage. The continuous progress of transient batteries and integration with transient devices are promising for sustainable electronics in the future.

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Section: Discussionmentioning

confidence: 99%

Recent Progress in Transient Energy Storage using Biodegradable Materials

Yamada

2023

Adv Energy and Sustain Res

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Material design of biodegradable primary batteries: boosting operating voltage by substituting the hydrogen evolution reaction at the cathode

Yamada,

Honda

2024

Nanoscale

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Battery-less luminance sensor biomimicking human sensory nervous system

Yamada,

Toshiyoshi

2023

Applied Physics Letters

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With the evolution of materials science and microfabrication processes, energy harvesters have become sophisticated, achieving power outputs in the range of several milliwatts, and have become a promising alternative to conventional batteries. Although their output power is insufficient to continuously operate a wireless sensor module, energy harvesters can operate small integrated circuits, including timers, watches, and ring oscillators. In this study, we emulated the human sensory nervous system to develop a battery-less sensor with a built-in analog-to-digital converter. The human sensory nervous system comprises a sophisticated sensing mechanism that digitalizes external stimuli by pulse-density modulation. To mimic this behavior, we integrated a ring oscillator with photovoltaics, allowing it to function as a luminance sensor with an event-driven operation. The oscillation frequency of the ring oscillator changes with respect to the operating voltage; hence, the output voltage of the photovoltaic modulates the frequency by more than two orders of magnitude. The sensor exhibits oscillation frequencies of 10 kHz and 7.7 MHz corresponding to luminance levels of 25–25 000 lx. Its response times are 40 μs and 15 ms when the light source is turned on and off, respectively. Battery-less sensors expand the opportunities for the application of energy harvesters in biomedical, wearable, and environmental sensing.

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A normally off time-of-event logging system triggered by a battery-less sensor

Cited by 3 publications

References 15 publications

Recent Progress in Transient Energy Storage using Biodegradable Materials

Recent Progress in Transient Energy Storage using Biodegradable Materials

Material design of biodegradable primary batteries: boosting operating voltage by substituting the hydrogen evolution reaction at the cathode

Battery-less luminance sensor biomimicking human sensory nervous system

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