Chemistry of Materials · 2015 · 80 citations · 46 references
Natural SciencesChemistryMaterials ScienceElectronic MaterialsOptoelectronicsPolymer ChemistryConducting PolymersConductive PolymersOptical PolymersOrganic Electronic MaterialsOrganic SemiconductorsPolymer Thin FilmsCarrier Transport In Organic SemiconductorsCharge Carrier DensityCharge Carrier DynamicsCharge Carrier MobilityLight-absorbing LayersOrganic PhotovoltaicsSmall-angle X-ray ScatteringWide-angle X-ray Scattering
A novel donor–acceptor polymer, PPhTQ, is synthesized by condensing a phenanthrene unit onto a thiadiazoloquinoxaline moiety. This polymer shows a broad absorption band from visible to near-infrared and a very low optical bandgap of 0.80 eV. A well-balanced ambipolar field-effect behavior is observed for PPhTQ, with mobilities of 0.09 cm 2 V –1 s –1 for holes and 0.06 cm 2 V –1 s –1 for electrons. A two-dimensional charge carrier transport in the film is determined by low-temperature resistance measurements, and an ordered molecular organization mainly in a face-on fashion is found by grazing incidence wide-angle X-ray scattering. More importantly, a PPhTQ thin film phototransistor exhibits an excellent device performance with a maximum photoresponsivity of 400 A/W.
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