Effect of defect-enhanced molecular oxygen adsorption on the imbalance of hole versus electron mobility in conjugated polymers

Chi Ken Lu, Shu Ting Pi, Hsin-Fei Meng*

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

The generally observed higher hole mobility relative to electron mobility in conjugated polymers is explained with the defects and adsorbed molecular oxygen. Adsorption of the extrinsic molecular oxygen leads to that electrons are bound more tightly than holes by the traps in the originally symmetric electronic system. Hence, the mobility imbalance emerges from the asymmetric binding energies. Besides, the defects are the favored adsorption sites because the intermolecular attraction is enhanced due to stronger induced dipole-dipole interaction when gap defect levels appear.

Original languageEnglish
Article number195206
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number19
DOIs
StatePublished - 9 May 2007

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