Abstract
ABSTRACTWe present the synthesis and optical and electrical characterization of amorphous nanocomposite layers made of metallic nanoclusters embedded in an alumina (Al2O3) matrix (nc-M:Al2O3 with M= Ag, Cu and Co). The nanocomposites, obtained by a pulsed laser deposition (PLD)- derived method, exhibit specific optical plasma resonance absorption in the visible and UV region. The position of the absorption peaks depends on the cluster type and gives information about its dimension and nature (metal or oxide). The results fit well with the size and shape distribution recorded by transmission electron microscopy (TEM). Electrical properties and conduction mechanisms of nc-Co:Al2O3 layers were investigated for different doping levels and in temperature range of 303-473 K. It was concluded that space charge limited currents theory (SCLC) can be assumed as major conduction mechanism, at least for intermediate doping levels (∼9 vol.%).
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