Journal of Materials Chemistry · 2009 · 102 citations · 18 references
Natural SciencesMaterials EngineeringMaterials ScienceElectronic MaterialsMaterials ChemistrySemiconductor MaterialsDopingOptoelectronic MaterialsOrganic Electronic MaterialsOrganic SemiconductorsPhotovoltaic MaterialsSemiconductor Device MaterialsDoping StrategiesElectrical Transport PropertiesElectron TransferHighest Occupied Molecular OrbitalHole TransportOptical AbsorptionP-type DopingWork Function
The authors present a concept to p-dope organic hole transport materials with highest occupied molecular orbital (HOMO) levels on the order of 6 eV (e.g.4,4′,4″-tris(N-carbazolyl)-triphenylamine (TCTA) or 4,4′-bis(carbazol-9-yl)biphenyl (CBP)) by using WO3 as acceptor. Owing to its large work function, WO3 allows for efficient electron transfer from organic semiconductors with HOMO levels in this region. The effect of p-type doping is evidenced by optical absorption spectroscopy, electrical transport characteristics and Kelvin probe analysis. Moreover, OLED devices have been realized which exhibit 30% enhanced power efficiency due to the p-type doping. The results are expected to have a significant impact on the development of organic (opto-)electronic devices.
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Highly efficient simplified organic light emitting diodes
Jens Meyer, Sami Hamwi, Tim Bülow et al. · Applied Physics Letters · 2007 · 262 citations