Evaluating the role of energetic disorder and thermal activation in exciton transport

S. Matthew Menke, Russell J. Holmes

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Temperature dependent measurements of the exciton diffusion length (LD) are performed for three archetypical small-molecule, organic semiconductors: aluminum tris-(8-hydroxyquinoline) (Alq3), dicyanovinyl-terthiophene (DCV3T), and boron subphthalocyanine chloride (SubPc). The experimental results are well-reproduced with stochastic simulations for LD by accounting for the presence of energetic disorder and thermal activation within both the inhomogeneously broadened density of states and the rate of intermolecular Förster energy transfer, respectively. In turn, activated and non-activated transport regimes can be distinguished, and exciton energy transfer within these materials can be deconvoluted from energetic disorder - providing insight regarding the fundamental parameters limiting LD.

Original languageEnglish (US)
Pages (from-to)3437-3442
Number of pages6
JournalJournal of Materials Chemistry C
Volume4
Issue number16
DOIs
StatePublished - Apr 28 2016

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