Abstract
Poly (methyl methacrylate) (PMMA) thin film (TF) was employed on TiO 2 nanowires (NWs) to fabricate organic–inorganic hybrid UV photodetector (PD), and its properties were studied and compared with bare TiO 2 NW-based PD. A maximum photoresponsivity of 20×10− 3 A/W and a maximum external quantum efficiency of ∼ 3.15% were observed in the UV region at 370 nm (∼ 3.35 eV ). Enhanced photon absorption was observed in the hybrid detector. The TF of PMMA, which is a π -conjugated polymer, increased the carrier lifetime and reduced recombination rate. The PMMA TF:TiO 2 NWs hybrid UV detector shows excellent rectification, and light current/dark current ratio was measured to be ∼ 1.46 times in comparison to bare TiO 2 NWs photodetector in the reverse bias condition from − 1 to − 10 V .
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