Controlling Charge Injection Properties in Polymer Field-Effect Transistor by Incorporation of Solution Processed Molybdenum Trioxide

A simply and facilely synthesized MoO3 solution was developed to fabricate charge injection layers for improving the charge-injection properties in p-type organic field-effect transistors (OFETs). By dissolving MoO3 powder in ammonium (NH3) solvent under air atmosphere, an intermediate ammonium molybdate ((NH4)2MoO4) precursor is made stable, transparent and to be spin-coated to form the MoO3 interfacial layers, of which the thickness and morphology can be well-controlled. When the MoO3 layer was applied to OFETs with a cost-effective molybdenum (Mo) electrode, the field-effect mobility (μFET) was significantly improved to be 0.17 or 1.85 cm/V·s for polymer semiconductors, regioregular poly(3-hexylthiophene) (P3HT) Page 1 of 20 Physical Chemistry Chemical Physics P hy si ca lC he m is tr y C he m ic al P hy si cs A cc ep te d M an us cr ip t