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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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A sub-wavelength Si LED integrated in a CMOS platform.

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Researchers developed a compact, high-intensity silicon light-emitting diode (LED) using standard microelectronics fabrication. This nanoscale LED enables advanced integrated photonics and compact holographic microscopes.

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Area of Science:

  • Integrated Photonics
  • Microelectronics
  • Nanoscale Light Sources

Background:

  • High-intensity nanoscale light sources are crucial for integrated photonics.
  • Existing emitters face challenges with standard integrated circuit (IC) fabrication compatibility.
  • Silicon (Si) is a preferred material for ICs but has limitations in light emission.

Purpose of the Study:

  • To report an electrically driven silicon light-emitting diode (Si-LED) with a sub-wavelength emission area.
  • To demonstrate compatibility with standard complementary metal-oxide-semiconductor (CMOS) platforms.
  • To showcase the potential of such emitters in advanced optical systems.

Main Methods:

  • Fabrication of a Si-LED on an open-foundry microelectronics CMOS platform.
  • Characterization of the Si-LED's emission spectrum (centered at 1100 nm) and sub-wavelength emission area (<0.14 μm²).
  • Integration of the Si-LED into a compact lensless in-line holographic microscope.

Main Results:

  • Achieved high spatial intensity (>50 mW/cm²) from the nanoscale Si-LED.
  • Demonstrated high spatial coherence due to sub-wavelength confinement.
  • Successfully utilized the Si-LED to illuminate ~9.5 million pixels in a CMOS imager for microscopy.

Conclusions:

  • The developed Si-LED offers a viable solution for on-chip light sources compatible with standard IC technology.
  • The high intensity and spatial coherence make it suitable for advanced integrated photonic applications.
  • This technology enables the creation of compact, high-performance optical systems like holographic microscopes.