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HL: Fachverband Halbleiterphysik

HL 74: Poster IIIA

HL 74.23: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/2OG

Optical characterization of MoTe₂-based monolayer-monolayer heterostructures — •Mohammed Adel Aly¹, Shachi Machchhar¹, Manan Shah¹, Lorenz Maximilian Schneider¹, Saeideh Edalati Boostan², Claudia Draxl², Wolfram Heimbrodt¹, and Arash Rahimi-Iman¹ — ¹Faculty of Physics and Materials Sciences Center, Philipps-Universität, Marburg, 35032 Germany — ²Theoretical solid state physics, Institute for Physics, Humboldt-Universität Berlin, 12489 Berlin, Germany

Van-der-Waals heterostructures (vdW-HSs) based on 2D layered materials have received huge attention due to their strong light matter interaction and the promise of bandgap engineering capabilities. Owing to the strong out-of-plane quantum confinement and electronic interaction between the layers, the HSs can exhibit exotic properties. Moreover, the strain effect is recognized as an effective parameter in the modulation of electronic properties. Although in recent years a few reports on MoTe₂/WSe₂ HS have emerged, a comprehensive study exploring their properties is still lacking. Here, we present our cooperative theoretical/experimental work on MoTe₂/WSe₂ type-I and MoTe₂/MoSe₂ type-II vdW-HSs. We have investigated our specimen using µ–PL and reflection contrast, shedding light on exciton physics in such structures, band alignment and possible charge transfer between type-II layers. We performed µ–Raman spectroscopy to determine the characteristic phonon modes and their separation to extract possible strain values. Our overall strain estimation is derived from the variation in the excitonic peaks and Raman modes’ positions.