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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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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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Fast and efficient Sb-based type-II phototransistors integrated on silicon.

Lining Liu1, Simone Bianconi1, Skyler Wheaton1

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Researchers developed new type-II heterojunction phototransistors (HPTs) for efficient optical interconnects. These photodetectors offer high gain-bandwidth product and superior energy efficiency for advanced computing and sensing applications.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • On-chip photodetectors are crucial for optical interconnects in computing and sensing.
  • Heterojunction phototransistors (HPTs) offer high energy efficiency but have limited gain-bandwidth product (GBP) compared to avalanche photodiodes at low optical powers.

Purpose of the Study:

  • To enhance the GBP and energy efficiency of phototransistors for dense optical interconnects.
  • To demonstrate the benefits of type-II energy band alignment in Sb-based HPTs.

Main Methods:

  • Fabrication of Sb-based HPTs utilizing type-II energy band alignment.
  • Integration of type-II HPTs with silicon photonic waveguides.
  • Characterization of device performance, including junction capacitance, GBP, dark current, and energy consumption.

Main Results:

  • Type-II HPTs exhibited a six-fold reduction in junction capacitance per unit area.
  • Achieved a GBP comparable to avalanche photodiodes (∼270 GHz) at low optical powers.
  • Demonstrated one order of magnitude better energy efficiency than avalanche devices, consuming 5 fJ/bit at 3.2 Gbps with a low error rate.

Conclusions:

  • Type-II band alignment in Sb-based HPTs significantly improves performance for optical interconnects.
  • These highly efficient and compact photodetectors enable new possibilities for optical receivers.
  • The developed HPTs are suitable for dense optical interconnects in emerging computational and sensing applications.