Abstract
We have investigated the oxydation and iodination of (CH)x-films and found that iodine doped samples degrade in oxygen at a lower rate than pure samples. The iodination can be described as a diffusion process, the diffusion constant being D ≈ 10-14 − 10−13 cm2/sec. This value for D is by many orders of magnitude smaller than those normally encountered for diffusion of gases in polymers. The insulator-metal transition, observed at high iodine concentrations, was investigated by optical transmission measurements. The results show that the forbidden gap remains roughly unaffected if the conductivity changes from the semiconducting to the metallic state. Also, below the gap a peak in absorption builds up with increasing iodine concentration but no absorption characteristic for free carriers is observed. These experimental observations are of importance for the selection of models which are to describe the insulator-metal transition and some consequences hereof are discussed.
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Kiess, H., Meyer, W., Baeriswyl, D. et al. Investigation on the doping of Polyacetylene Films. J. Electron. Mater. 9, 763–781 (1980). https://doi.org/10.1007/BF02652895
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DOI: https://doi.org/10.1007/BF02652895