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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

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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.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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MOSFET01:16

MOSFET

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The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
472
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

356
Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
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MOSFET Amplifiers01:17

MOSFET Amplifiers

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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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Characteristics of MOSFET01:17

Characteristics of MOSFET

378
Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
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Sub-volt high-speed silicon MOSCAP microring modulator driven by high-mobility conductive oxide.

Wei-Che Hsu1,2, Nabila Nujhat1, Benjamin Kupp1

  • 1School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR, USA.

Nature Communications
|January 27, 2024
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Summary
This summary is machine-generated.

Researchers developed a novel silicon microring modulator using transparent conductive oxide for energy-efficient optical interconnects. This device achieves high modulation efficiency, enabling low driving voltage and reduced power consumption for optical computing applications.

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Area of Science:

  • Photonics
  • Materials Science
  • Electrical Engineering

Background:

  • Silicon microring modulators are crucial for energy-efficient optical interconnects and computing due to their small size and wavelength-division multiplexing capabilities.
  • Existing modulators require high driving voltages (>2 Vpp), limiting their energy efficiency and practical application.
  • High driving voltage is a bottleneck caused by material properties and device design limitations.

Purpose of the Study:

  • To develop a silicon microring modulator with significantly reduced driving voltage.
  • To enhance energy efficiency in optical interconnects and optical computing.
  • To leverage advanced materials for improved modulator performance.

Main Methods:

  • Heterogeneous integration of silicon photonics with titanium-doped indium oxide, a high-mobility transparent conductive oxide (TCO).
  • Utilized the strong plasma dispersion effect in the TCO material.
  • Co-fabricated the device using Intel's silicon photonics fab and in-house TCO patterning.

Main Results:

  • Achieved a high modulation efficiency of 117 pm/V.
  • Demonstrated operation with a very low driving voltage (Vpp) of 0.8 V.
  • Obtained clear eye diagrams at 25 Gb/s with an energy efficiency of 53 fJ/bit at an 11 GHz modulation bandwidth.

Conclusions:

  • The novel TCO-based microring modulator significantly lowers driving voltage requirements.
  • This advancement offers superior energy efficiency for optical interconnects and computing.
  • Heterogeneous integration provides a viable path for next-generation, low-power photonic devices.