NOVELTY - Spray deposition comprises: subjecting a first solution of cadmium telluride or cadmium selenide nanocrystals to ligand exchange with a small coordinating molecule; diluting the first solution in solvent to form a second solution; applying the second solution to a substrate; drying the substrate; dipping the substrate in a solution in methanol of a compound that promotes sintering; washing the substrate with isopropyl alcohol; and drying the substrate with nitrogen and heating the substrate and forming a film on the substrate.    USE - The method is useful for spray deposition that is used for inorganic nanocrystal solar cells (claimed).    ADVANTAGE - The method: exhibits high material deposition efficiency (4 times efficient) than spin coating; utilizes non standard substrates that are not compatible with spin or dip coating; fills any defect in the film; produces high quality films of 500 nm thickness, and that tolerate additional processing steps without damage; allows coating the substrates in parallel, thus reducing time necessary for preparation of multiple samples; produces films that are robust enough to withstand a standard photolithography lift-off process, and do not exhibit film-shrinkage, peeling or warping; enables multiple substrates with a large area to be processed in parallel, dramatically reducing fabrication time; controls morphology of the film with great precision; produces pinhole free films suitable for devices despite the high surface roughness; and allows material system to function when all components including the top and bottom contact are applied.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) an inorganic nanocrystal solar cell (I) comprising: a substrate; a layer of metal; a layer of cadmium telluride; a layer of cadmium selenide; and a layer of transparent conductor;    (2) an inorganic nanocrystal solar cell (II) comprising: a solid non-porous substrate; a layer of conductive polymer or transparent conducting oxide; a layer of cadmium telluride; a layer of cadmium selenide; and a layer of transparent conductor; and    (3) an inorganic nanocrystal solar cell (III) comprising: a transparent conductive substrate; a layer of cadmium selenide; a layer of cadmium telluride; and a gold contact.