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P-N junction01:11

P-N junction

1.4K
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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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

2.2K
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.2K
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Bipolar Junction Transistor01:22

Bipolar Junction Transistor

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Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Atomically Abrupt Topological p-n Junction.

Sung Hwan Kim1, Kyung-Hwan Jin2, Byung Woo Kho

  • 1Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS) , Pohang 37673, Republic of Korea.

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|August 22, 2017
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Summary

Researchers created a novel p-n junction using topological surface states (TSS) in 3D topological insulators. This breakthrough enables atomic-scale lateral junctions for advanced spintronics and quantum computing devices.

Keywords:
angle-resolved photoemission spectroscopyscanning tunneling microscopy/spectroscopytopological insulatortopological p−n junctionultrathin Sb film

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Computing

Background:

  • Topological insulators (TIs) possess unique surface states with potential for spintronics and quantum computing.
  • Practical TI device applications require p-n junctions, but fabricating lateral topological p-n junctions has been difficult.

Purpose of the Study:

  • To demonstrate a new method for creating lateral p-n junctions of topological surface states (TSS) in 3D topological insulators.
  • To overcome fabrication challenges and enable atomic-scale topological p-n junctions.

Main Methods:

  • Growing an ultrathin antimony (Sb) film on a 3D topological insulator (Bi2Se3) with n-type TSS.
  • Utilizing the hybridization between the Sb film and the Bi2Se3 surface to induce a p-type TSS.
  • Characterizing the atomically abrupt interface and the resulting lateral junction.

Main Results:

  • Achieved a strongly p-type TSS on the Bi2Se3 surface due to Sb film hybridization.
  • Created a lateral electronic junction with n- and p-type TSS separated by atomic step edges.
  • Demonstrated a junction width as small as 2 nm, achieving atomic-scale control.

Conclusions:

  • This innovative approach successfully realizes a lateral p-n junction of topological surface states.
  • The method offers a new pathway for developing scalable electronic and spintronic devices based on topological p-n junctions.
  • The atomic-scale junction achieved opens possibilities for next-generation quantum technologies.