Electrical Conductivity of Ion Implanted Ladder and Semi-Ladder Polymers
Abstract
Aromatic heterocyclic ordered rigid rod, ladder and semi-ladder polymers (including BBL, PBO, PBT, and BBB) combine exceptional high temperature stability with excellent mechanical properties as well as environmental stability. We have continued our systematic study of the electronic, photonic, and environmental properties of the pristine polymer. We have discovered the presence of a significant photoconductivity in PBO and characterized its photoluminescence. Extending our photoinduced absorption spectroscopy studies to the millisecond regime we have found the presence of two weak photoinduced optical absorptions. The difference in behavior as compared to other conjugated polymers likely reflects the increased order in the pristine rigid rod and ladder polymers. We have extended our temperature dependent charge transport (dc conductivity, microwave frequency conductivity and dielectric constant, thermoelectric power, magnetoconductivity and electron spin resonance) studies of the ion implanted polymers as a function of implantation dosage., A nonmetal- to-metal transition is found as a function of increasing dosage (occurring at 4 x 10(exp 16) ions/sq cm). For implanted samples of metallic behavior, a unique transition to a nonmetallic behavior has been discovered at 30K. The origin of this transition is attributed to the opening up of a Coulomb gap.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 02, 1993
- Accession Number
- ADA267432
Entities
People
- Arthur J. Epstein
Organizations
- Ohio State University