Publication Date:
2014-12-16
Description:
The influence of sodium on the band structure of MoS 2 (0001) and the comparison of the experimental band dispersion with density functional theory show excellent agreement for the occupied states (angle-resolved photoemission) and qualitative agreement for the unoccupied states (inverse photoemission spectroscopy). Na-adsorption leads to charge transfer to the MoS 2 surface causing an effect similar to n-type doping of a semiconductor. The MoS 2 occupied valence band structure shifts rigidly to greater binding with little change in the occupied state dispersion. Likewise, the unoccupied states shift downward, approaching the Fermi level, yet the amount of the shift for the unoccupied states is greater than that of the occupied states, effectively causing a narrowing of the MoS 2 bandgap.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics