Abstract
A new liquid-phase photodeposition process of cadmium thin films from aqueous cadmium sulphide colloid solutions has been developed. In this process, the photoexcitation of CdS colloid particles causes the formation of elementary cadmium which is partly precipitated in the bulk of the photoreactor and partly adsorbed on the reactor optical window, creating thin films. The initial photodeposition growth rates are small, indicating an adsorption-controlled process. The continuation stage growth is much faster and also thermally activated. The quantum yield increases by several orders of magnitude from visible (514 nm) to UV (366 nm) radiation. The adsorption affinity of photo-precipitated cadmium particles is highest for cadmium material sites on the substrate. Onto UV pre-deposits, ultrathin films could efficiently be grown with visible argon laser lines. Preliminary image recordings indicate the potential use for high resolution cadmium thin film pattern applications.
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