Abstract
TiO2 nanowire clusters (NWCs) covered with Ag nanoparticles (NPs) were synthesized on Si substrates using GLAD technique. Ag NPs/TiO2 NWCs showed enhanced optical absorption all over the spectrum compared to bare TiO2 NWCs. The leakage current of the TiO2 NWCs device (−10.8 μA) was reduced by ∼9 × 103 times for Ag NPs/TiO2 NWCs detector (−1.2 nA) at −1 V applied bias. Ag NPs/TiO2 NWCs detector exhibited maximum photoresponsivity ∼2.4 times (−2 V) as compared to the bare TiO2 NWCs detector. Using 10 K photocapacitance measurement, a sharp peak at 355 nm (∼3.5 eV) was detected due to the main band transition. The other sub band gap defects were observed within 410–490 nm along with a broad hump between 595–700 nm. The light dependent capacitance-time (I-T) characteristic of the Ag/TiO2 NWCs detector shows rise-time (T r ) of 9.6 s and decay time (T d ) of 10 s.
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