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Electronic Properties and Orientation Studies of Poly‐3‐Alkylselenophene Electrochemically Deposited on Pt As Observed by NEXAFS
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1990
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EngineeringOrganic ElectronicsElectronic PropertiesChemistryPolymersSemiconductorsConducting PolymerElectronic DevicesOrganic ElectrochemistryOrientation StudiesPoly‐3‐alkylselenophene Electrochemically DepositedLong Alkyl ChainSelenophene Ring StructurePolymer ChemistryMaterials ScienceOrganic SemiconductorElectrochemistryElectronic MaterialsSemiconducting PolymerApplied PhysicsFunctional Materials
The electronic properties and orientation of films of poly‐3‐alkylselenophenes electrochemically deposited onto Pt have been studied by NEXAFS. The C—K edge characteristics reveal that several major effects occur when n is increased from 0 to 9: (i) In the undoped semiconducting form, a continuous decrease in the polymeric 1s → π* intensity is observed due to an overlap between the π* antibonding band from the polymer and the band which develop when the alkyl chain length increases. (ii) The doping to the conducting state proceeds via a narrowing of the bandgap causing the appearance of metallic‐like behavior. However, the changes in the unoccupied antibonding π* band become less pronounced for a long alkyl chain length. (iii) The orientation of the selenophene ring structure switches from a "lying‐down" to an "on‐edge" configuration with the long alkyl chain being oriented perpendicular to the Pt surfaces.