Search results for "Vacuum evaporation"

showing 3 items of 3 documents

Fabrication and characterization of vacuum deposited fluorescein thin films

2011

Simple vacuum evaporation technique for deposition of dyes on various solid surfaces has been developed. The method is compatible with conventional solvent-free nanofabrication processing enabling fabrication of nanoscale optoelectronic devices. Thin films of fluorescein were deposited on glass, fluorine-tin-oxide (FTO) coated glass with and without atomically layer deposited (ALD) nanocrystalline 20 nm thick anatase TiO2 coating. Surface topology, absorption and emission spectra of the films depends on their thickness and the material of supporting substrate. On a smooth glass surface the dye initially formes islands before merging into a uniform layer after 5 to 10 monolayers. On FTO cove…

Absorption spectroscopyta221Analytical chemistryFOS: Physical sciencesSubstrate (electronics)Vacuum evaporationVacuum depositionMesoscale and Nanoscale Physics (cond-mat.mes-hall)Materials ChemistryThin filmta216ta116Surface statesCondensed Matter - Materials ScienceCondensed Matter - Mesoscale and Nanoscale Physicsta114business.industryChemistryMetals and AlloysMaterials Science (cond-mat.mtrl-sci)Surfaces and InterfacesNanocrystalline materialSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsOptoelectronicsbusinessLayer (electronics)Thin Solid Films
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Light-emitting diodes based on phenylenevinylene oligomers with defined chain lengths

1997

Abstract We present characteristic electroluminescence data on single-layer devices based on three different oligo phenylenevinylene compounds with defined chain lengths. Light-emitting diodes (LEDs) were prepared by subsequent vacuum evaporation of the oligomer film and the A1 top electrode onto an indium—tin oxide (ITO) substrate. The LEDs show light emission in the spectral range of yellow to orange depending on the conjugation length of the compound used. We report photoluminescence and optical absorption data of the thin sublimed films, together with the wavelength dependence of the electroluminescence and with the current—voltage characteristics of the LED devices. The redox behavior …

PhotoluminescenceMaterials sciencebusiness.industryMechanical EngineeringMetals and AlloysElectroluminescenceCondensed Matter PhysicsPhotochemistryElectronic Optical and Magnetic MaterialsVacuum evaporationlaw.inventionMechanics of MaterialslawElectrodeMaterials ChemistryOptoelectronicsLight emissionCyclic voltammetrybusinessDiodeLight-emitting diode
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Preparation of thin films of the ternary heavy fermion system CeNi 2 Ge 2

1998

Ge2 layers on W(110). In order to produce well-ordered and atomically clean surfaces of the Ce-based intermetallic system the growth was performed under UHV conditions (p<2×10-11 mbar). Both the polycrystalline CeNi2Ge2 compound and the individual elements Ce, Ni, and Ge were used as evaporants. The characterisation of the layers was made with LEED, SEM, and XPS. We find a significant influence of the substrate temperature and the evaporation power on the growth characteristics. The compound material CeNi2Ge2 exhibits complicated behaviour when evaporated. Under carefully selected growth conditions we obtain well-ordered films with a stoichiometry of Ce:Ni:Ge=1:2:2 and a (001) oriented surf…

Tetragonal crystal systemValence (chemistry)X-ray photoelectron spectroscopyChemistryIntermetallicAnalytical chemistryMineralogyGeneral Materials ScienceGeneral ChemistryCrystalliteThin filmTernary operationVacuum evaporationApplied Physics A: Materials Science &amp; Processing
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