Control mechanisms for transport and nonlinear optical response in organic materials

A tale of twists and barriers

Antonio Facchetti, Geoffrey R. Hutchison, Shahar Keinan, Mark A Ratner

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Simple electronic structure models are used to address two significant challenges in organic materials chemistry, the design of chromophores for strong electro-optic response (and low-energy optical absorption), and the prediction of relative mobilities and charge injection barriers for conductive oligomers. For electro-optic response, we examine two chromophore classes where twisting around an inter-ring bond can tune the electronic structure from aromatic (zwitterionic) to quinoid (neutral). The calculated nonlinear response develops a very strong maximum (βμ ∼ 1500 ×10-30 esu) at twist angles near 80°. For the transport behavior, structure/function correlations are presented for three series of oligomers, based on calculations of bandwidths (as functions of geometry) and of reorganization energies. Transport type appears to be fixed less by these mobility factors than by the injection barriers. The simplest estimates for these Schottky-type barriers, using frontier orbital energies from density functional calculations, predict carrier n-type or p-type behavior remarkably well.

Original languageEnglish
Pages (from-to)3980-3990
Number of pages11
JournalInorganica Chimica Acta
Volume357
Issue number13
DOIs
Publication statusPublished - Nov 1 2004

Fingerprint

Chromophores
Electrooptical effects
organic materials
Oligomers
Electronic structure
Organic Chemistry
oligomers
Charge injection
chromophores
Injections
electro-optics
Light absorption
injection
electronic structure
Density functional theory
twisting
Bandwidth
Geometry
energy
optical absorption

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Control mechanisms for transport and nonlinear optical response in organic materials : A tale of twists and barriers. / Facchetti, Antonio; Hutchison, Geoffrey R.; Keinan, Shahar; Ratner, Mark A.

In: Inorganica Chimica Acta, Vol. 357, No. 13, 01.11.2004, p. 3980-3990.

Research output: Contribution to journalArticle

Facchetti, Antonio ; Hutchison, Geoffrey R. ; Keinan, Shahar ; Ratner, Mark A. / Control mechanisms for transport and nonlinear optical response in organic materials : A tale of twists and barriers. In: Inorganica Chimica Acta. 2004 ; Vol. 357, No. 13. pp. 3980-3990.
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