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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
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Capacitors01:15

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Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
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Spin-Coated Heterogenous Stacked Electrodes for Performance Enhancement in CMOS-Compatible On-Chip

Agin Vyas1, Simin Zare Hajibagher1, Ulises Méndez-Romero2

  • 1Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Kemivägen 9, 41296, Gothenburg, Sweden.

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Summary
This summary is machine-generated.

We developed novel microsupercapacitors (MSCs) using graphene oxide derivatives via a CMOS-compatible process. These stacked MSCs offer enhanced energy density for Internet-of-Things (IoT) devices.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Microsupercapacitors (MSCs) are crucial for powering wireless sensor nodes in Internet-of-Things (IoT) architectures.
  • Integration challenges exist for MSCs with nanoenergy harvesters and on-chip components.
  • CMOS-compatible fabrication and heterogeneous electrode stacking are needed for versatile MSC integration.

Purpose of the Study:

  • To fabricate modular, high energy density MSCs using graphene oxide derivatives.
  • To develop a scalable, CMOS-compatible fabrication process for stacked MSCs.
  • To evaluate the performance of stacked MSCs compared to individual electrodes.

Main Methods:

  • Fabrication of multielectrode MSCs using reduced graphene oxide (GO), GO-heptadecane-9-amine (GO-HD9A), rGO-octadecylamine (rGO-ODA), and rGO-heptadecane-9-amine (rGO-HD9A).
  • Utilized a scalable, CMOS-compatible spin-coating process for high-wafer-yield fabrication.
  • Performance comparison of stacked electrode MSCs against individual electrode MSCs using EMIM-TFSI electrolyte.

Main Results:

  • Individual electrodes demonstrated capacitances of 38, 30, 36, and 105 μF cm⁻² at 20 mV s⁻¹.
  • The fabricated stack of electrodes achieved a significantly higher capacitance of 280 μF cm⁻² at 20 mV s⁻¹.
  • The stacked MSCs retained and enhanced material-dependent capacitance, charge retention, and power density.

Conclusions:

  • A scalable, CMOS-compatible method for fabricating stacked MSCs with graphene oxide derivatives was successfully demonstrated.
  • The developed stacked MSCs exhibit superior capacitance and enhanced performance characteristics compared to individual units.
  • This advancement facilitates improved lifetime and integration of wireless sensor nodes in IoT applications.