Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.89: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Work Function and Electron affinity of Some Layered Transition Metal Dichalcogenide Materials — •Mohamed Moustafa, Alexander Paulheim, Michael Niehle, Karl Mildner-Spindler, Christoph Janowitz, and Recardo Manzke — Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin.

Work function and electron affinity values of various semiconducting and metallic layered transition metal dichalcogenides (TMDCs) which might be suitable for the photovoltaic applications (such as ZrS_xSe_2−x where 0≤ x≤2, HfSe₂, HfS₂, TiTe₂, NbTe₂, TaS₂) have been measured using photoemission spectroscopy and vibrating capacitor Kelvin probe techniques [1, 2]. All samples were single crystals grown by the chemical vapour transport method with iodine as a transport agent. The measured values are compared to the previously reported empirical and calculated values based on various band models, and proved good agreement for most of the materials.

[1] G. Ertl and J. Küppers, Low Energy Electrons and Surface Chemistry. Verlag. Chemie, Weinheim, (1985).

[2] P.P. Craig and V. Redeka, Rev. Sci. Instrum. 41,(1970).