Spatial distribution and dynamics of space charges in poly(2, 5-pyridinediyl)
Abstract
We present investigations of the spatial distribution of space charges in thin films of conjugated polymers. A thermal wave method, the laser intensity modulation method, has been used to resolve the depth profile of space charges and the distribution of the internal electric field in 3-4 μ m films of poly(2, 5-pyridinediyl). The dynamics of the space-charge accumulation has been investigated by means of measurements of the temporal evolution and the temperature dependence of the pyroelectric response. The results demonstrate that in conjugated polymers, space charges of either sign can be stored permanently by deep trapping. This charge significantly reduces the internal electric field in the bulk of the films.
- Publication:
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Journal of Physics Condensed Matter
- Pub Date:
- September 2002
- DOI:
- 10.1088/0953-8984/14/36/305
- Bibcode:
- 2002JPCM...14.8455F