Low-cost solution growth of wafer-scale, high-quality MoS 2 thin films via synergistic precursor stabilization

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Abstract A novel approach to wafer-scale, high-quality MoS 2 thin film fabrication is demonstrated using an improved solution-based method that employs synergistic precursor stabilization. The key innovation involves an optimized solution with ammonium tetrathiomolybdate ((NH 4 ) 2 MoS 4 ) as the molybdenum and sulfur source, dimethyl sulfoxide as the solvent, ethylenediaminetetraacetic acid (EDTA) as the chelating agent. Ethanolamine’s role in facilitating EDTA dissolution enhances solution stability and enables controlled thermal decomposition. By constructing two heterojunctions of Ag/V 2 O 5 /MoS 2 /Ag and Ag/MoS 2 /V 2 O 5 /Ag, the optoelectronic properties were tested under different wavelengths and bias voltages. The V 2 O 5 /MoS 2 photodetector delivers optimal photoelectric performance at 600 nm illumination, achieved a responsivity of 120 mA W −1 and a detectivity of 0.88 × 10 −10 Jones at 2 V, with a response/recovery time of 82.38/43.31 μ s. Furthermore, the photogenerated carrier transport behavior of the MoS 2 device was analyzed in detail. This ethanolamine-assisted technique offers a cost-effective, liquid-phase route to high-quality 2D films and provides a framework for novel heterostructure fabrication.

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