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Related Concept Videos

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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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Deposited low temperature silicon GHz modulator.

Yoon Ho Daniel Lee, Michael O Thompson, Michal Lipson

    Optics Express
    |November 13, 2013
    PubMed
    Summary

    We developed a gigahertz electro-optic modulator using low-temperature polysilicon, compatible with CMOS technology. This advancement enables high-speed data transmission for silicon photonics applications.

    Area of Science:

    • Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Silicon photonics is crucial for high-speed optical communication.
    • Integrating modulators directly onto silicon substrates presents manufacturing challenges.
    • Low-temperature fabrication methods are needed for CMOS compatibility.

    Purpose of the Study:

    • To demonstrate a gigahertz electro-optic modulator fabricated on low-temperature polysilicon.
    • To achieve carrier injection modulation compatible with CMOS backend integration.
    • To explore new possibilities for silicon photonics.

    Main Methods:

    • Utilized excimer laser annealing for polysilicon fabrication.
    • Fabricated an electro-optic modulator device.
    • Performed carrier injection modulation tests.

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    Main Results:

    • Achieved gigahertz operation of the electro-optic modulator.
    • Demonstrated carrier injection modulation at 3 Gbps.
    • Confirmed compatibility with CMOS backend integration.

    Conclusions:

    • Low-temperature polysilicon is a viable material for high-performance electro-optic modulators.
    • Excimer laser annealing enables CMOS-compatible fabrication.
    • This technology opens avenues for advanced silicon photonics, including integration with DRAM and flexible substrates.