Se films were successfully formed on a glass substrate in an aqueous solution containing SeO{sub}3{sup}(2-). and SO{sub}3{sup}(2-) ions by photochemical reactions, and CdSe films were formed in an aqueous solution containing SeO{sub}3{sup}(2-), SO{sub}3{sup}(2-) and Cd{sup}(2+) ions. SO{sub}3{sup}(2-) ions in the growth solution absorb ultra-violet light of wavelengths shorter than about 300nm, and the excited SO{sub}3{sup}(2-) ions supply electrons to the SeO{sub}3{sup}(2-) and Cd{sup}(2+) ions. Thus, the formation reaction of Se and CdSe occur only in the illuminated region. The deposited films were amorphous, and crystallinity were improved by the annealing.
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