An electronic device like a thin film transistor containing an arylamine polymer of the formula ##STR00001## wherein Ar is aryl or heteroaryl; X represents CH.sub.2, sulfur, oxygen, selenium, NR', or SiR''.sub.2 wherein R' and R'' are each a suitable hydrocarbon; m represents the number of X substituents; and n represents the number of repeating units.

 
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