Solution-Processed Polyfluorene:Naphthalenediimide-N-Doped TiO2 Hybrids for Ultraviolet Photodetector Applications

In this study, highly efficient ultraviolet (UV) photodetectors based on a solution-processed system are introduced. Nitrogen-doped TiO2 nanoparticles are embedded in poly(9,9-dioctylfluorenyl-2,7-yleneethynylene) (PFE):N,N'-bis-n-butyl-1,4,5,8-naphthalenediimide (BNDI) (3:1 wt.%) blends. An UV- active layer of [(PFE:BNDI)(3:1):ammonium hydroxide-TiO2] [9:1 wt.%] gave a photoresponsivity value of 545 +/- A 6.92 mA/W at -4 V under 1 mW/cm(2) UV light at 365 nm, and this value was increased to 597 +/- A 9.22 mA/W on annealing the active layer at 60A degrees C. The efficiencies obtained are strongly dependent on the nitrogen source nature, their donor-acceptor relationship, and the morphological interaction with the PFE:BNDI blend.