ZnO/poly(9,9-dihexylfluorene) based inorganic/organic hybrid ultraviolet photodetector

Solution processed inorganic/organic hybrid films of ZnO nanoparticles and poly(9,9-dihexylfluorene) (PFH) are sandwiched between two electrodes to form bulk heterojunction in this letter. The devices obtained show high ultraviolet photo-to-dark current ratio of about three orders of magnitude for -1 V bias with a relatively fast response speed of less than 200 ms after aging in air for enough time. The spectral response covers 300-420 nm, with its peak locating around 335 nm. Those results indicate that the ZnO/PFH hybrid devices might be used as low-cost UV optical switches or photodetectors. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3003881]