Peculiarities of cathodic decomposition (solid-state reduction) products of compound semiconductors such as CdSe, CdS, InP, CuO, etc. are reviewed and analyzed. Such products are either metals, metal-like (rich in metal) non-stoichiometric compounds with disordered structure, their mixtures, or their solid solutions. Their presence on the substrate surface can substantially accelerate subsequent electrodeposition of metals from the solutions containing their salts because these products improve the conditions for the initial stages of this process (accumulation of adatoms and nucleation). A brief explanation of this process is presented.
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