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Related Concept Videos

Carrier Transport01:21

Carrier Transport

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.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
P-N junction01:11

P-N junction

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...
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
Debye–Huckel–Onsager Conductance Equation01:28

Debye–Huckel–Onsager Conductance Equation

The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...

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Related Experiment Video

Updated: May 10, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Gate-dependent carrier diffusion length in lead selenide quantum dot field-effect transistors.

Tyler Otto1, Chris Miller, Jason Tolentino

  • 1Department of Physics, University of California, Davis, California 95616, United States.

Nano Letters
|June 28, 2013
PubMed
Summary

Scanning photocurrent microscopy reveals long carrier lifetimes in colloidal lead selenide quantum dot transistors. This is attributed to charge traps, enabling stable and high-mobility field-effect transistors (FETs).

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Colloidal quantum dots (QDs) offer tunable optoelectronic properties.
  • Lead selenide (PbSe) QDs are promising for photodetectors and transistors.
  • Achieving stable, high-performance field-effect transistors (FETs) from QDs remains a challenge.

Purpose of the Study:

  • To investigate carrier transport dynamics in colloidal PbSe QD thin film FETs.
  • To understand the factors contributing to photocurrent decay length.
  • To correlate device stability and performance with carrier lifetime.

Main Methods:

  • Fabrication of PbSe QD thin film FETs using atomic layer deposition (ALD) for alumina coating.
  • Chemical treatment of PbSe QDs with sodium sulfide (Na2S).
  • Scanning photocurrent microscopy (SPCM) to probe photocurrent decay length and carrier diffusion.

Main Results:

  • High mobility, air-stable PbSe QD FETs with gate-dependent conductivity were achieved.
  • SPCM revealed a photocurrent decay length of 1.7 μm at moderate positive gate bias.
  • Decay length decreased significantly at higher positive and all negative gate voltages.

Conclusions:

  • Long photocurrent decay length is attributed to the diffusion of long-lived carriers.
  • The long minority carrier lifetime is likely due to charge traps for majority carriers.
  • This study provides insights into optimizing QD-based FET performance and stability.