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A new 2H-2H'/1T co-phase in polycrystalline MoS2 and MoSe2 thin films.

Research paper by Mehwish M Naz, Toby T Hallam, Nina C NC Berner, Niall N McEvoy, Riley R Gatensby, John B JB McManus, Zareen Z Akhter, Georg S GS Duesberg

Indexed on: 25 Oct '16Published on: 25 Oct '16Published in: ACS Applied Materials & Interfaces



Abstract

We report on 2H-2H'/1T phase conversion of MoS2 and MoSe2 polycrystalline films grown by thermally assisted conversion. The structural conversion of the transition metal dichalcogenides was successfully carried out by organolithium treatment on chip. As a result we obtained a new 2H-2H'/1T co-phase system of the TMDs thin films which was verified by Raman spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The conversion was successfully carried to on selected areas yielding a lateral heterostructure between the pristine 2H phase and the 2H'/1T co-phase regions. Scanning Electron Microscopy and Atomic Force Microscopy revealed changes in the surface morphology and work function of the co-phase system in comparison to the pristine films, with a surprisingly sharp lateral interface region.