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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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Quantum device designing (QDD) for future semiconductor engineering.

J D John1, S Nishimoto1, N Kadowaki1

  • 1Department of Physics, International Christian University, 3-10-2 Osawa, Mitaka, Tokyo 181-8585, Japan.

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Summary
This summary is machine-generated.

Researchers developed a new method for designing quantum devices using amorphous materials, overcoming fabrication challenges. This approach links multiplication gain in superlattices to the number of material layers, improving device functionality.

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Area of Science:

  • Semiconductor device physics
  • Quantum device engineering
  • Materials science

Background:

  • Semiconductor device functionality historically improved with narrower, more numerous material layers.
  • Superlattices offer unique functionality but face fabrication barriers (e.g., molecular beam epitaxy, lattice-matched materials).

Purpose of the Study:

  • To present a novel method for designing quantum devices using amorphous materials and physical vapor deposition.
  • To investigate the relationship between superlattice layer number and multiplication gain.
  • To explore the trade-off between multiplication gain and transit time.

Main Methods:

  • Utilized amorphous materials and physical vapor deposition for quantum device design.
  • Fabricated photodetector devices on Silicon (Si) with Selenium (Se) and Arsenic triselenide (As2Se3) superlattices.
  • Characterized devices using current-voltage (I-V) and current-time (I-T) measurements.

Main Results:

  • Demonstrated that multiplication gain (M) is proportional to the number of superlattice layers (N), M = kN.
  • Quantified the multiplication efficiency factor (k) for different superlattice thicknesses: k = 0.916 for 200 nm and k = 0.384 for 2 μm.
  • Observed a trade-off between multiplication gain and transit time, both dependent on N.

Conclusions:

  • The study confirms the relationship between multiplication factor and the number of superlattice layers.
  • The presented design approach using amorphous materials is effective for quantum device fabrication.
  • This method offers a potential solution to overcome existing technological barriers in superlattice device adoption.