Indium sulfide is usually prepared by direct combination of the elements.
Production from volatile complexes of indium and sulfur, for example dithiocarbamates (e.g. EtInSCNEt), has been explored for vapor deposition techniques.
Thin films of the beta complex can be grown by chemical spray pyrolysis.  Solutions of In(III) salts and organic sulfur compounds (often thiourea) are sprayed onto preheated glass plates, where the chemicals react to form thin films of indium sulfide.  Changing the temperature at which the chemicals are deposited and the In:S ratio can affect the optical band gap of the film.
Single-walled indium sulfide nanotubes can be formed in the laboratory, by the use of two solvents (one in which the compound dissolves poorly and one in which it dissolves well).  There is partial replacement of the sulfido ligands with O, and the compound forms thin nanocoils, which self-assemble into arrays of nanotubes with diameters on the order of 10 nm, and walls approximately 0.6 nm thick. The process mimics protein crystallization.