Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 85: Topological Insulators 2 (MA with HL/TT)

HL 85.8: Talk

Thursday, March 19, 2015, 16:45–17:00, EB 202

WSe₂ Synthesis, Characterization and Properties — •Catherine R Rajamathi, Binghai Yan, Marcus Schmidt, Kumari Gaurav Rana, Chandra Shekhar, Siham Ouardi, Guido Kreiner, and Claudia Felser — Max-Planck Institute for Chemical Physics of Solids, Dresden

Layered transition metal dichalcogenides (TMDs) are widely studied systems as they are chemically versatile and technologically enthralling. The facile tunability of their electronic structure by varying certain parameters - carrier type (n- or p-type), composition, structure or sample size expand their applications from catalysis to topological insulators. Single crystals were synthesized from its polycrystalline components using SeCl₄ as the transport agent. Mono- or few-layered tungsten selenide obtained by the scotch-tape technique discussed in this talk are direct-gap semiconductors. FET devices fabricated from a few-layered sample of WSe₂ show ambipolar transistor behavior. In addition, hybrid materials such as WSe_2−xTe_x may be promising due to high magnetoresistance and surface states on WTe₂ single crystals.