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Adsorbate/Absorbate Interactions With Organic Ferroelectric Polymers, Peter A. Dowben, Luis G. Rosa, Carolina C. Ilie, Jie Xiao
Adsorbate/Absorbate Interactions With Organic Ferroelectric Polymers, Peter A. Dowben, Luis G. Rosa, Carolina C. Ilie, Jie Xiao
Peter Dowben Publications
We discuss the interactions of adsorbates with the organic ferroelectric copolymer poly(vinylidene fluoride (PVDF)–trifluoroethylene (TrFE)). Range of molecular adsorbates is discussed from the smaller polar molecules like water, which is small enough to both adsorb and absorb, to the larger macrocyclic metal–organic metal phthalocyanines. The changes in local dipole orientation may affect the strength of the coupling between adsorbate or absorbate and the copolymer poly(vinylidene fluoride–trifluoroethylene). The interface dipole interactions may also affect device properties. The dipole interactions are implicated at the interface between copper phthalocyanine and poly(vinylidene fluoride with trifluoroethylene) affecting the band offsets and the diode properties.
Different Approaches To Adjusting Band Offsets At Intermolecular Interfaces, Peter A. Dowben, Jie Xiao, Bo Xu, Andrei Sokolov, Bernard Doudin
Different Approaches To Adjusting Band Offsets At Intermolecular Interfaces, Peter A. Dowben, Jie Xiao, Bo Xu, Andrei Sokolov, Bernard Doudin
Peter Dowben Publications
We show that at the hetero-molecular interface, the molecular band offsets can be modified by either adjusting the dopant or dopant concentration of one or both molecular layers or by changing the dipole orientation at the intermolecular interface. Photoemission studies reveal the changes in electronic structure and diode devices exhibit conduction properties that are altered in response to changes to the molecular band offsets. As a demonstration, thin film copper phthalocyanine to crystalline ferroelectric copolymer poly(vinylidene fluoride with trifluoroethylene) heterojunction diodes, without additional dopants, are compared with doped polyaniline layers on the crystalline ferroelectric copolymer poly(vinylidene fluoride with trifluoroethylene).