The effect of ketone defects on the charge transport and charge recombination in polyfluorenes
article
The effect of on-chain ketone defects on the charge transport of the polyfluorene derivative poly(9,9-dioctylfluorene) (PFO) is investigated. Using MoO3 as ohmic hole contact, the hole transport in a pristine PFO diode is observed to be limited by space-charge, whereas fluorenone contaminated PFO (PFO-F) is shown to be trap limited by the occurrence of an exponential trap distribution with a trap depth of 0.18 eV. The electron transport in PFO is also observed to be trap limited, but in order to describe the electron transport of PFO-F, an additional trap level with a depth of 0.46 eV must be introduced. The obtained energy levels of the fluorenone trapping sites are in close agreement with cyclic voltammetry (CV) measurements reported in literature. As a result, the fluorenone defects are shown to simultaneously act as hole- and electron trap. Moreover, through ideality factor measurements, the green emission associated with these defects is observed to originate from trap-assisted recombination.
Topics
Characterization toolsOrganic electronicsOrganic light-emitting diodesCharge recombinationsElectron transportExponential trap distributionFluorenone defectGreen emissionsHole transportsIdeality factorsPoly(9 ,9-dioctylfluorene)Polyfluorene derivativePolyfluorenesSpace chargesTrap depthTrap levelsTrapping sitesConjugated polymersCyclic voltammetryElectron transitionsElectron transport propertiesLight emitting diodesMolybdenum oxideOrganic compoundsKetones
TNO Identifier
445707
ISSN
1616301X
Source
Advanced Functional Materials, 21(23), pp. 4502-4509.
Pages
4502-4509
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