Transport and Optical Studies of Dendritic Phenylene with Regioregular Poly(3-hexylthiophene) Termination Arms
Abstract
We report the study of a novel hyperbranched polymer containing polythiophene on the periphery with a variety of dopants (NOPF_6, FeCl_3, and I_2) and doping methods (doping in solution and doping precast films). Room temperature conductivity ranges from 10 to 70 S/cm dependent on dopant and fabrication method. Photoluminescence and absorbance of undoped samples are nearly identical to those of linear P3HT. DC transport of doped samples exhibits variable range hopping with the highest conducting I2 doped samples approaching close to the insulator to metal transition. Samples with 30% dopant to thiophene repeat unit ratio have absorption spectra consistent with bipolaron formation. A possible limitation for reaching the IMT is that the non-conjugated (1,3,5 phenylene) hyperbranched cores act as scattering centers limiting the maximum charge carrier delocalization length.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2000
- Bibcode:
- 2000APS..MARG21005F