Abstract
Steady state photoconductivity, optical absorption and dark conductivity measurements in thin films of polydiacetylene ((8-butoxycarbonyl)methylurethanyl)-1-(5-pyrimidyl)octa-1, 3-diyne (PDA-BPOD) are reported. Steady state photoconductivity results are discussed within the framework of the one-dimensional Onsager theory of geminate recombination. The photoconductivity action spectrum shows a peak at 1.9 eV and a direct band to band transition above 2.4 eV. The absorption spectrum at 50 K is red shifted with respect to the 300 K spectrum. Dark conductivity studies show that the dominant conduction at high fields is due to Schottky emission with a barrier of 0.65 eV.
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