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Sökning: WFRF:(Semenova E)

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  • Kadkhodazadeh, S., et al. (författare)
  • Towards quantitative three-dimensional characterisation of buried InAs quantum dots
  • 2011
  • Ingår i: Journal of Physics: Conference Series. - 1742-6588 .- 1742-6596. ; 326:1
  • Konferensbidrag (refereegranskat)abstract
    • InAs quantum dots grown on InP or InGaAsP are used for optical communication applications operating in the 1.3 - 1.55 μm wavelength range. It is generally understood that the optical properties of such dots are highly dependent on their structural and chemical profiles. However, morphological and compositional measurements of quantum dots using transmission electron microscopy can be ambiguous because the recorded signal is usually a projection through the thickness of the specimen. Here, we discuss the application of scanning transmission electron microscopy tomography to the morphological and chemical characterisation of surface and buried quantum dots. We highlight some of the challenges involved and introduce a new specimen preparation method for creating needle-shaped specimens that each contain multiple dots and are suitable for both scanning transmission electron microscopy tomography and atom probe tomography.
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  • Galakhov, V. R., et al. (författare)
  • Electronic structure and x-ray spectra of defective oxides LixCoO2
  • 2006
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 74:4, s. 045120-
  • Tidskriftsartikel (refereegranskat)abstract
    • X-ray absorption, resonant x-ray emission, and x-ray photoelectron spectra of the valence band and core levels have been measured for LixCoO2 (0.6 <= x <= 1.0). Resonant O K alpha x-ray emission spectra of LiCoO2 showed localized excitonic states due to a dd transition between unoccupied and occupied Co 3d states. On the basis of measurements of Co 3s x-ray photoelectron and Co 2p and O 1s x-ray absorption spectra it was established that in defective cobaltites the electronic holes are localized mainly in O 2p states. Evidence of phase separation in LixCoO2 has been found.
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  • Resultat 1-10 av 16
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