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Related Concept Videos

P-N junction01:11

P-N junction

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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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Thermodynamics: Chemical Potential and Activity01:10

Thermodynamics: Chemical Potential and Activity

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The effective concentration of a species in a solution can be expressed precisely in terms of its activity. Activity considers the effect of electrolytes present in the vicinity of the species of interest and depends on the ionic strength of the solution. The activity of a species is expressed as the product of molar concentration and the activity coefficient of the species.
The thermodynamic equilibrium constant is more accurately defined in terms of activity rather than concentration.
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

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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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Thermopower in Underpotential Deposition-Based Molecular Junctions.

Peng He1, Abdalghani H S Daaoub2, Sara Sangtarash2

  • 1Department of Chemistry, Korea University, Seoul 02841, Korea.

Nano Letters
|January 25, 2024
PubMed
Summary
This summary is machine-generated.

Underpotential deposition (UPD) enhances thermoelectricity in molecular junctions. Copper UPD on gold electrodes significantly boosts the Seebeck coefficient in alkyl monolayers by tuning electronic structures.

Keywords:
Seebeck coefficientmolecular junctionthermopowertunnelingunderpotential deposition (UPD)

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Underpotential deposition (UPD) offers a method to modify electronic properties at interfaces.
  • Molecular tunnel junctions based on alkyl self-assembled monolayers (SAMs) are studied for thermoelectric applications.

Purpose of the Study:

  • To investigate the effect of UPD on the thermoelectric properties of molecular tunnel junctions.
  • To explore how modifying electrode interfaces impacts the Seebeck coefficient in alkyl SAMs.

Main Methods:

  • Fabrication of molecular tunnel junctions using alkyl self-assembled monolayers (SAMs).
  • Utilizing bimetallic electrodes with copper UPD on gold (Cu UPD on Au).
  • Measuring the Seebeck coefficient of the molecular junctions.
  • Performing quantum transport calculations to understand electronic structure changes.

Main Results:

  • A significant enhancement in the Seebeck coefficient was observed for alkanoic acid (up to 2-fold) and alkanethiol (up to 4-fold) monolayers.
  • The enhancements were achieved by replacing conventional gold electrodes with Cu UPD on Au electrodes.
  • Quantum transport calculations revealed UPD-induced shifts in transmission resonances of gateway orbitals.

Conclusions:

  • UPD is an effective strategy for tuning the thermoelectric performance of molecular junctions.
  • The choice of anchor group influences the UPD-induced changes in the molecule-electrode contact.
  • This work demonstrates UPD's potential for optimizing thermoelectric devices based on alkyl SAMs.