A thin-film deposition suite similar to the one described in this section has been designed and is currently being installed in our laboratory. It is our hope that it will allow rapid combinatorial exploration of (almost) any ternary and quaternary PS system with any molar ratio between the desired metals, and with a very wide range of P/S ratios. Clearly, there should be effective safety measures in place before working with such a setup. Among them, the potential release of PH 3 and H 2 S gases should be prevented, reaction products should be neutralized, and materials of unknown toxicity and reactivity should be appropriately handled.