Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 3: 2D Materials: Session I (joint session DS/CPP/HL)

HL 3.12: Talk

Monday, March 12, 2018, 12:30–12:45, H 2032

Defect mediated phase transformation of two-dimensional 2H-MoTe2 to the distorted 1T'-MoTe2 — •Tibor Lehnert¹, Mahdi Ghorbani-Asl², Janis Köster¹, Hannu-Pekka Komsa³, Arkady Krasheninnikov^2,3, and Ute Kaiser¹ — ¹Electron Microscopy Group of Materials Science, University of Ulm, Ulm 89081, Germany — ²Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany — ³Department of Applied Physics, Aalto University, P.O. Box 11100, 00076 Aalto, Finland

We applied the newly developed Cc-and Cs-corrected SALVE (Sub-Angstrom Low-Voltage Electron Microscopy)[1] instrument, to study the dynamics of extended defects in single-layer 2H-MoTe2. In particular we report atom by atom on the transformation of an area in single-layer MoTe2 from the semiconducting 2H to the distorted and metallic 1T* phase, starting with a single vacancy line of missing Te atoms. We find that the size of the transformed area is defined by the length of the single vacancy line. First-principles calculations are performed to understand the transformation's driving forces.

[1] www.salve-project.de