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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
Biasing of Metal-Semiconductor Junctions01:27

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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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.
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Vertical junction silicon microdisk modulators and switches.

Michael R Watts1, William A Zortman, Douglas C Trotter

  • 1Massachusetts Institute of Technology, Research Laboratory of Electronics, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. mwatts@mit.edu

Optics Express
|November 24, 2011
PubMed
Summary
This summary is machine-generated.

Vertical junction resonant microdisk modulators offer record-low power consumption and voltage operation. These compact, high-speed silicon modulators achieve 3 fJ/bit efficiency, enabling advanced optical communication systems.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Electrical Engineering

Background:

  • Resonant microdisk modulators are crucial for optical communications.
  • Existing lateral junction designs face limitations in power consumption and size.
  • Vertical junction designs offer potential for improved performance.

Purpose of the Study:

  • To review the progress of vertical junction microdisk modulators.
  • To provide design data and compare vertical to lateral junction performance.
  • To highlight the advantages of vertical junction designs for modulators and switches.

Main Methods:

  • Fabrication and characterization of vertical junction resonant microdisk modulators.
  • Analysis of device performance metrics including power consumption, speed, and voltage.
  • Comparison of vertical junction designs with traditional lateral junction approaches.

Main Results:

  • Demonstration of sub-100 fJ/bit silicon modulators using depletion-mode operation.
  • Achievement of 3 fJ/bit communications efficiency with 3.5 μm diameter modulators at 12.5 Gb/s.
  • Development of second-order active high-speed bandpass switches with ~2.5 ns switching speeds.

Conclusions:

  • Vertical junction designs significantly reduce power consumption and drive voltage in microdisk modulators.
  • These modulators represent the smallest and lowest power devices demonstrated to date.
  • Vertical junction technology enables the construction of advanced optical filters and high-performance communication systems.