Abstract: The photo- and dark-conductivities of trans-polyphenylacetylene were studied.The V-I curves are basically parallel which indicates that the carrier transport mechanism of photo-and dark-conduction is similar.From the experiments at different temperatures,it was obtained that the activation energies of the samples at photo- and dark-conduction in ohmic region are 0.24±0.03eV and 0.58±0.03eV,respectively.

Key words: polyphenylacetylene, photoconductivity, V-I characteristics