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New material structure produces world's fastest transistor

Discussion in 'Electronic Basics' started by phaeton, Apr 11, 2005.

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  1. phaeton

    phaeton Guest

    Maybe y'all knew this already, or maybe it's not immediately useful to
    anyone. Rather sparse article too, but possibly interesting. If
    posting things like this in sci.electronics.basics is a no-no or
    otherwise frowned upon, kindly let me know :+:


    The new device -- built from indium phosphide and indium gallium
    arsenide -- is designed with a compositionally graded collector, base
    and emitter to reduce transit time and improve current density. With
    their pseudomorphic heterojunction bipolar transistor, the researchers
    have demonstrated a speed of 604 gigahertz -- the fastest transistor
    operation to date.

    "Pseudomorphic grading of the material structure allows us to lower the
    bandgap in selected areas," said Milton Feng, the Holonyak Professor of
    Electrical and Computer Engineering and a researcher at the Coordinated
    Science Laboratory at Illinois. "This permits faster electron flow in
    the collector. The compositional grading of the transistor components
    also improves current density and signal charging time."

    Feng and graduate student Walid Hafez fabricated the new device in the
    university's Micro and Nanotechnology Laboratory. They describe the
    pseudomorphic HBT concept, and discuss the transistor's high-speed
    operation, in the April 11 issue of the journal Applied Physics

    The goal of a terahertz transistor was not possible using the previous
    device structure, Feng said. "To achieve such speed in a typical HBT,
    the current density would become so large it would melt the components.
    In our pseudomorphic HBT, we can operate at higher frequencies with
    less current density. With this new material structure, a terahertz
    transistor is achievable."

    Faster transistors could facilitate faster computers, more flexible and
    secure wireless communications systems, and more effective electronic
    combat systems.
  2. Ban

    Ban Guest

    go on, I like the electronic combat systems.
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