HIGHLY ORIENTED PHOTOACTIVE POLYCRYSTALLINE MOS2 LAYERS OBTAINED BY VAN-DER-WAALS RHEOTAXY TECHNIQUE FROM ELECTROCHEMICALLY DEPOSITED THIN-FILMS

Molybdenum sulphide thin films were cathodically electrodeposited from aqueous solutions of sodium tetrathiomolybdate on quartz substrate co vered by a thin Ni-Cr layer. Annealing of these films in sulphur conta ining atmosphere at high-temperature resulted in the formation of high ly-textured films of MoS2 with the van der Waals planes parallel to th e substrate and crystal size in the micrometer range. The annealed fil ms are photoactive and their photoconductivity measurements reveal a d irect band gap of about 1.71 eV. (C) 1998 Elsevier Science B.V. All ri ghts reserved.