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Abstract Details
Charge Transport in Regioregular Polythiophene and Relationship to Molecular Weight
| Speaker | Joe Kline (Stanford University) |
| Full Author List | R.J. Kline (1), M. McGehee (1), E.N. Kadnikova (2), J. Liu (2), J.M.J. Fréchet (2), M.F. Toney (3), (none) (0), (none) (0), (none) (0), (none) (0) |
| Affiliations | 1. Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA,
2. Department of Chemistry, University of California. Berkeley, CA, USA,
3. Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Stanford, CA, USA,
4. (none),
5. (none),
6. (none),
7. (none),
8. (none),
9. (none),
10. (none) |
| Category | Materials Science |
| Abstract |
Regioregular poly (3-hexylthiophene) (P3HT) is one of the leading candidates to replace amorphous silicon as the active layer of low-cost thin-film transistors. P3HT is also being investigated for use in bulk heterojunction photovoltaic cells. The charge carrier mobility is the key materials property for both devices. We have studied the effect of molecular weight on charge carrier mobility and film morphology in thin film polymer transistors and space charge limited diodes made from P3HT. We have observed a substantial increase in mobility with increasing molecular weight in both structures. We have also observed relationships between mobility and annealing, casting solvent, and casting method. We have used atomic force microscopy and grazing incidence x-ray scattering to identify the dominant changes in morphology and relate them to these changes in charge transport.
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SSRL