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Related Concept Videos

Carrier Transport01:21

Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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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.
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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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Heat Driven Transport in Serial Double Quantum Dot Devices.

Sven Dorsch1, Artis Svilans1, Martin Josefsson1

  • 1Solid State Physics and NanoLund, Lund University, Box 118, SE-221 00 Lund, Sweden.

Nano Letters
|January 18, 2021
PubMed
Summary

Researchers developed a novel nanostructure for studying heat-driven transport and energy harvesting. This system allows for the investigation of fundamental thermodynamics and the conversion of heat into electrical power using phonon-assisted transport.

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nanowirephonon assisted transportquantum dotthermal energy harvestersthermoelectric effect

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Area of Science:

  • Nanoscience and Nanotechnology
  • Condensed Matter Physics
  • Thermodynamics

Background:

  • Studies of thermally induced transport in nanostructures are crucial for understanding fundamental thermodynamic concepts.
  • Nanostructures offer potential for realizing efficient thermal energy harvesters.
  • Quantum dots are promising systems for exploring nanoscale transport phenomena.

Purpose of the Study:

  • To investigate thermally induced transport in a serial double quantum dot system.
  • To explore phonon-assisted transport and its role in nanoscale heat engines.
  • To disentangle conventional thermoelectric effects from phonon-assisted transport.

Main Methods:

  • Fabrication of a serial double quantum dot in an InAs/InP nanowire.
  • Utilizing a local metallic joule-heater to enhance phonon bath temperature.
  • Employing detailed modeling and experimental tuning of interdot coupling.

Main Results:

  • Demonstrated phonon-assisted transport, enabling conversion of local heat into electrical power.
  • Observed conventional thermoelectric transport due to altered electron reservoir temperatures.
  • Successfully disentangled phonon-assisted and thermoelectric transport effects.
  • Showed that phonon-assisted transport is sensitive to excited states.

Conclusions:

  • The designed nanostructure is versatile for studying fluctuations and fundamental nanothermodynamics.
  • Phonon-assisted transport in quantum dots can function as a nanosized heat engine.
  • The findings provide insights into nanoscale energy conversion and fundamental physics.