0000000000255679

AUTHOR

D. Pfisterer

showing 2 related works from this author

Negative U‐properties of the oxygen‐vacancy in ZnO

2006

It is shown that the intensity of the oxygen vacancy (VO) related emission in ZnO at 2.45 eV correlates to the concentration of the donor level E4. E4 is located 530 meV below the conduction band and attributed to the VO0/++ recharging. Deep level transient spectroscopy (DLTS) experiments with optical excitation locate the VO2+/+ level position 140 meV below the conduction band and give evidence for the “negative- U” properties of the oxygen vacancies in ZnO. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Deep-level transient spectroscopyChemistrychemistry.chemical_elementAtomic physicsCondensed Matter PhysicsOxygenConduction bandExcitationOxygen vacancyIntensity (physics)physica status solidi c
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Intrinsic and extrinsic point-defects in vapor transport grown ZnO bulk crystals

2006

Vapor transport grown ZnO bulk crystals were characterized by electrical, optical and magnetic resonance spectroscopy. The experiments show that the residual carrier concentration is caused by residual H, Al, Ga, and oxygen vacancies in the material. Annealing the samples in O 2 at about 1000 °C (2 atm, 20 h) reduces the H and V O donor concentration by typical one order of magnitude. The photoluminescence and DLTS results suggest a correlation between the broad unstructured emission at 2.45eV (green band) and a donor level 530 meV below the conduction band (E4).

Materials sciencePhotoluminescenceDeep-level transient spectroscopyAnnealing (metallurgy)Analytical chemistryCrystal structureCondensed Matter PhysicsCrystallographic defectElectronic Optical and Magnetic MaterialsNuclear magnetic resonanceCharge carrierElectrical and Electronic EngineeringSpectroscopyLuminescencePhysica B: Condensed Matter
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