“…These are physical vapor methods such as sulfurization of e-beam evaporated metallic layers and sputtered layers [24,25], RF magnetron sputtering [26], co-evaporation [27], hybrid sputtering [28]. Chemical methods involve sulfurization of electrochemically deposited metallic precursors [29], photochemical deposition [30], sol-gel sulfurization methods [31], sol-gel spin-coated deposition [32] and spray pyrolysis [33,34]. In addition, there are syntheses based on solution methods [35,36].…”