Profound effect of substrate hydroxylation and hydration on electronic and optical properties of monolayer MoS<inf>2</inf>
- Publication Type:
- Journal Article
- Nano Letters, 2015, 15 (5), pp. 3096 - 3102
- Issue Date:
© 2015 American Chemical Society. Atomic force microscopy, Kelvin probe force microscopy, and scanning photoluminescence spectroscopy image the progressive postgrowth hydroxylation and hydration of atomically flat Al
2O 3(0001) under monolayer MoS 2, manifested in large work function shifts (100 mV) due to charge transfer (>1013 cm-2) from the substrate and changes in PL intensity, energy, and peak width. In contrast, trapped water between exfoliated graphene and Al 2O 3(0001) causes surface potential and doping changes one and two orders of magnitude smaller, respectively, and MoS 2 grown on hydrophobic hexagonal boron nitride is unaffected by water exposure.
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