Photochemical deposition (PCD), a novel deposition technique of compound se
miconductors from an aqueous solution, was developed. A substrate was held
in an aqueous solution containing S2O32- and metal ions, and was irradiated
with a mercury lamp. Then, a sulfide (CdS and ZnS) film was deposited in t
he irradiated region of the substrate. The deposited CdS films have an oran
ge-yellow color and an optical absorption edge near 500 nm. The composition
is almost stoichiometric for a wide range of pH values of the solution (3.
5-8). ZnS was also deposited by PCD, but the composition is Zn-rich. Nearly
stoichiometric -films were obtained after annealing at 500 degrees C. (C)
1999 Elsevier Science B.V. All rights reserved.