Chemical vapour deposition of rhenium disulfide and rhenium-doped molybdenum disulfide thin films using single-source precursors

Abstract

Polycrystalline thin films of rhenium disulfide (ReS₂) and the alloys Mo_1−xRe_xS₂ (0 ≤ x ≤ 0.06) have been deposited by aerosol-assisted chemical vapour deposition (AA-CVD) using [Re(μ-SⁱPr)₃(SⁱPr)₆] (1) and [Mo(S₂CNEt₂)₄] (2) in different molar ratios at 475 °C. The deposited films were characterised by p-XRD, SEM, and ICP-OE, Raman, and EDX spectroscopies. The p-XRD patterns of the films deposited from (1) correspond to ReS₂ (x = 1) and those deposited from (2) matched to MoS₂ (x = 0). Re-doping of up to 6% was achieved in MoS₂ thin films by using different concentrations of precursor (1), the morphology of the doped films changed from lamellar for pure MoS₂ to clusters at 6 mol% alloying with rhenium. The films are promising candidates as models for the incorporation of technetium into transition metal dichalcogenides as a means of immobilisation in nuclear waste processing. Exfoliation of these films is also a potential route towards modification of the optoelectronic properties of 2D molybdenite.