Abstract
We have used optical absorption and X-ray photoelectron spectroscopy to study a processable polymer blend, consisting of poly(ethylenevinylacetate) loaded with 20 % poly(3-octylthiophene) (EVA/POT). The results of a study of the thermochromic effect and the thermally-induced undoping of the iron chloride doped polymer blend are compared with that of poly(3-octylthiophene) (POT) for the thermochromic effect and with poly(3-hexylthiophene) (P3HT) for the thermally-induced undoping. A doped solution of the polymer blend can be cast to form a doped solid film which is stable against undoping in laboratory atmosphere at room temperature. A study of the temperature dependent undoping of thin and thick films reveals a diffusion limited undoping process.
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