Dispersed Ag nanoparticles on TiO2 nanowire clusters for photodetection

The glancing angle deposition (GLAD) technique has been employed to synthesize TiO2 nanowire clusters (NWCs) covered with Ag nanoparticles (NPs) on Si (n-type) substrates. The Field emission scanning electron microscopy (FE-SEM) characterization has shown Ag NPs distribution on the TiO2 NWCs surface. The photoluminescence emission intensity from the TiO2 NWCs/Ag NPs sample reduced due to the formation of Ag-O complex on the TiO2 surface. The Current (I) - voltage (V) characteristics have been measured for TiO2 NWCs/Ag NPs structure under white light and dark conditions. The ideality factor ~ 16.1 for TiO2 NWCs/Ag NPs and ~ 7.04 for TiO2 NWCs based detectors have been calculated. The switching on/off time response shows rise time (Tr) of 23.60 sec and decay time (Tf) of 23.11 sec for TiO2 NWCs/Ag NPs detector.

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