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Related Concept Videos

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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Biasing of Metal-Semiconductor Junctions01:27

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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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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.
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Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
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Stereoelectronic switching in single-molecule junctions.

Timothy A Su1, Haixing Li2, Michael L Steigerwald1

  • 1Department of Chemistry, Columbia University, New York 10027, USA.

Nature Chemistry
|February 21, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created the first single-molecule switch using stereoelectronics. This molecular switch operates by altering molecular conformation, enabling digital control over conductance between two states.

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Area of Science:

  • Chemistry and electronic circuitry
  • Molecular electronics
  • Single-molecule devices

Background:

  • Ultraminiaturization of electronic devices drives new intersections with reaction chemistry.
  • Stereoelectronics describes the relationship between molecular conformation and electronic properties.
  • Single-molecule break-junction techniques allow unprecedented control over molecular conformation.

Purpose of the Study:

  • To demonstrate the first single-molecule switch operating via a stereoelectronic effect.
  • To explore the use of permethyloligosilanes and methylthiomethyl linkers in molecular switches.
  • To establish a digital switching mechanism based on molecular conformation.

Main Methods:

  • Fabrication of single-molecule break-junction devices.
  • Utilizing permethyloligosilanes with methylthiomethyl electrode linkers.
  • Conductance measurements and theoretical calculations.

Main Results:

  • Demonstrated a single-molecule switch functioning through a stereoelectronic effect.
  • Identified three distinct molecular conformations with significantly different electronic characteristics.
  • Achieved digital switching of conductance by mechanically altering the molecular junction length.

Conclusions:

  • The study presents a novel single-molecule switch based on stereoelectronic principles.
  • Mechanical manipulation of molecular conformation provides a viable method for digital conductance switching.
  • This work bridges molecular chemistry and electronic device engineering.