The objectives of this research was to develop the chemistry for the synthesis of a new class of pentacene and tetracene containing polymers and oligomers. These materials were designed to have low bandgap and high charge carrier mobility. The general synthetic routes were developed for this class of materials. The synthesized new molecules and polymers were used for structural property relation studies to understand the effect of molecular structure on ...
Preliminary studies of the effect of x-ray irradiation, typically used to simulate radiation effects in space, on top contract, pentacene based field effect transistors have been carried out. Threshold voltage shifts in irradiated devices are consistent with positive charge trapping in the gate dielectric and a rebound effect is observed, independent of the sign of applied electric field during irradiation. Carrier mobility variations in positive electric field biased/irradiated devices are ...
A thermally cross-linkable, second-order nonlinear optical (NLO) polymer containing ethynyl groups has been synthesized. The ethynyl groups in the polymer backbone can undergo thermal intramolecular or intermolecular reactions with amide groups to form heterocyclic structures or cross linkages. The thermal curing of the polymer can be simultaneously effected during electric poling and second-harmonic generation measurements indicated that the cured polymers indeed showed high stability in dipole orientation; no obvious decay ...
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