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Related Concept Videos

Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Semiconductors01:22

Semiconductors

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...
Induced Electric Dipoles01:28

Induced Electric Dipoles

A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

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Intermolecular hybridization governs molecular electrical doping.

Ingo Salzmann1, Georg Heimel, Steffen Duhm

  • 1Humboldt-Universität zu Berlin, Institut für Physik, D-12489 Berlin, Germany. ingo.salzmann@physik.hu-berlin.de

Physical Review Letters
|March 10, 2012
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Summary

Molecular electrical doping models conflict with polaron formation concepts. We show intermolecular orbital hybridization explains doping, offering a strategy to improve charge carrier yield in organic semiconductors.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Physical Chemistry

Background:

  • Existing models for molecular electrical doping of organic semiconductors present inconsistencies with established concepts like polaron formation.
  • These discrepancies hinder a complete understanding of doping mechanisms in organic electronic materials.

Purpose of the Study:

  • To resolve inconsistencies between molecular doping models and polaron formation in organic semiconductors.
  • To provide experimental and theoretical evidence for a new doping mechanism.
  • To identify strategies for enhancing doping efficiency in organic semiconductors.

Main Methods:

  • Experimental investigations of prototypical organic semiconductor and dopant systems.
  • Theoretical calculations focusing on frontier molecular orbital interactions.
  • Analysis of doping-induced charge carrier generation.

Main Results:

  • Evidence for intermolecular hybridization between organic semiconductor and dopant frontier molecular orbitals was found.
  • Common doping phenomena were successfully attributed to this hybridization.
  • The degree of intermolecular hybridization was identified as a key factor influencing doping efficiency.

Conclusions:

  • Intermolecular orbital hybridization is a key mechanism in molecular electrical doping of organic semiconductors.
  • This hybridization reconciles current models with polaron formation concepts.
  • Controlling hybridization offers a pathway to overcome limitations in doping-induced charge carrier yield.