STEADY-STATE PHOTOCONDUCTIVITY IN A NOVEL SOLUTION-CAST POLYDIACETYLENE FILM

Steady-state photoconductivity in solution-cast thin films of a polydi acetylene, ((8-butoxy carbonyl)methyl urethanyl)-1-(5-pyrimidyl)-octa- 1,3-diyne (PDA-BPOD), has been investigated as a of function of light intensity, applied electric field, incident wavelength and temperature . This newly synthesized polydiacetylene is characterized by a conjuga ting aromatic side group which is expected to play a role in the elect ronic properties of the system. The results ae interpreted within the framework of one-dimensional Onsager theory of geminate recombination. The photoconductivity action spectrum shows a peak at 1.9 eV and dire ct band-to-band transition above 2.4 eV.