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Related Concept Videos

Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Types of Semiconductors01:20

Types of Semiconductors

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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...
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Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

882
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...
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Schottky Barrier Diode01:27

Schottky Barrier Diode

916
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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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

535
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...
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Full-core antimony sulfide platform for reconfigurable on-chip photonics.

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    Chalcogenide phase-change materials enable nonvolatile photonic devices. This study introduces an antimony trisulfide (Sb2S3) waveguide platform for enhanced index modulation and absorption, paving the way for reconfigurable integrated photonics.

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    Area of Science:

    • Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Chalcogenide phase-change materials offer large, reversible index shifts for nonvolatile, energy-efficient photonic technologies.
    • Current photonic devices face limitations such as lossy films, restricted index modulation, or poor optical confinement.
    • Existing implementations often involve ultrathin films with passive waveguides or direct laser writing, hindering performance.

    Purpose of the Study:

    • To demonstrate a novel antimony trisulfide (Sb2S3) waveguide platform for advanced photonic applications.
    • To overcome the limitations of current phase-change material integrations in photonic devices.
    • To provide a robust platform for reconfigurable and densely integrated photonic devices.

    Main Methods:

    • Fabrication of an antimony trisulfide (Sb2S3) waveguide core.
    • Theoretical analysis of effective index and absorption modulation.
    • Integration of the Sb2S3 material as the guiding core in a waveguide architecture.

    Main Results:

    • The proposed Sb2S3 waveguide platform theoretically supports significant modulation of effective index.
    • Substantial modulation of optical absorption is also theoretically achievable within the platform.
    • The architecture demonstrates potential for robust photonic device performance.

    Conclusions:

    • The Sb2S3 waveguide platform offers a promising solution for next-generation photonic devices.
    • This approach enables enhanced control over optical properties for reconfigurable integrated photonics.
    • The study lays the groundwork for densely integrated, nonvolatile photonic technologies.