Dr. rer. nat. Mykhaylo Semtsiv

Dr. Semtsiv entwickelt spezialisierte Halbleitermaterialien und Photodetektoren für die Terahertz-Spektroskopie und -Bildgebung. Sein aktueller Schwerpunkt liegt auf rhodium-dotierten InGaAs-Quantenphotoleitern, die das fundamentale Problem der Halbleiterphysik lösen: die Unvereinbarkeit zwischen hoher Ladungsträgermobilität und ultrakurzer Lebensdauer. Durch räumliche Trennung von Ladungsträgertransport und Trapping erreicht er Detektoren mit deutlich verbesserter Leistung für fasergebundene THz-Systeme. Die Technologie ermöglicht hochempfindliche, kompakte Spektroskopie- und Messinstrumente für Materialcharakterisierung, Qualitätskontrolle und Sensorik in Halbleiter-, Pharma- und Sicherheitstechnik.

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• Novel miniaturized photoacoustic cell integrated with compact mid-infrared widely-tunable laser for gas-detection applications

  Quelle ↗

  Zeitraum: 05/2014 - 04/2016 Projektleitung: Dr. rer. nat. Mykhaylo Semtsiv

• Mid-infrared optical properties of thin films of aluminum oxide, titanium dioxide, silicon dioxide, aluminum nitride, and silicon nitride

  2012

  Applied Optics · DOI

  The complex refractive index components, n and k, have been studied for thin films of several common dielectric materials with a low to medium refractive index as functions of wavelength and stoichiometry for mid-infrared (MIR) wavelengths within the range 1.54-14.29 μm (700-6500 cm(-1)). The materials silicon oxide, silicon nitride, aluminum oxide, aluminum nitride, and titanium oxide are prepared using room temperature reactive sputter deposition and are characterized using MIR variable angle spectroscopic ellipsometry. The investigation shows how sensitive the refractive index functions are to the O2 and N2 flow rates, and for which growth conditions the materials deposit homogeneously. It also allows conclusions to be drawn on the degree of amorphousness and roughness. To facilitate comparison of the materials deposited in this work with others, the index of refraction was also determined and provided for the near-IR and visible ranges of the spectrum. The results presented here should serve as a useful information base for designing optical coatings for the MIR part of the electromagnetic spectrum. The results are parameterized to allow them to be easily used for coating design.

• Influence of tip-induced band bending on tunnelling spectra of semiconductor surfaces

  2006

  Nanotechnology · DOI

  A theory based on the Bardeen formalism is developed for computing the tunnel current between a metal tip and a semiconductor surface. Tip-induced band bending in the semiconductor is included, with the electrostatic potential computed in a fully three-dimensional model whereas the tunnel current is computed in the limit of large tip radii. Localized states forming at the semiconductor surface as well as wavefunction tailing through the semiconductor depletion region are fully accounted for. Numerical results are provided and compared with data obtained from p-type GaAs surfaces, and generalization of the method to semiconductor heterojunctions is discussed.