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Related Concept Videos

Semiconductors01:22

Semiconductors

1.9K
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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.3K
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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P-N junction01:11

P-N junction

1.7K
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...
1.7K
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

815
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...
815
Types of Semiconductors01:20

Types of Semiconductors

1.8K
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...
1.8K
Schottky Barrier Diode01:27

Schottky Barrier Diode

1.3K
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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The Silicon:Colloidal Quantum Dot Heterojunction.

Silvia Masala1, Valerio Adinolfi2, Jon-Paul Sun3

  • 1Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.

Advanced Materials (Deerfield Beach, Fla.)
|October 14, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created a novel silicon-colloidal quantum dot heterojunction, overcoming band mismatch issues to efficiently detect infrared light with a sensitive photodetector.

Keywords:
PbScolloidal quantum dotsheterostructuresinfraredphotodectors

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Area of Science:

  • Semiconductor physics
  • Materials science
  • Optoelectronics

Background:

  • Crystalline silicon (c-Si) is a dominant semiconductor material.
  • Colloidal quantum dots (CQDs) offer tunable optoelectronic properties.
  • Integrating c-Si with CQDs presents challenges due to band energy mismatches.

Purpose of the Study:

  • To fabricate a heterojunction between c-Si and CQDs.
  • To address the energetic band mismatch at the interface.
  • To develop a sensitive near-infrared (NIR) photodetector.

Main Methods:

  • Interface modification techniques were employed to align energy levels.
  • Fabrication of a c-Si/CQD heterojunction structure.
  • Characterization of photodetector performance under NIR illumination.

Main Results:

  • An effective interface modification was successfully implemented.
  • Efficient collection of photocarriers generated in the CQD layer was achieved.
  • The resulting heterojunction exhibited high sensitivity as a NIR photodetector.

Conclusions:

  • The developed interface modification is crucial for efficient c-Si/CQD heterojunctions.
  • This approach enables the creation of high-performance NIR photodetectors.
  • The study highlights the potential of CQDs for advanced infrared sensing applications.