In Vacuo Photocurrent Measurements of Plasma Polymerized Styrene Films.
CALIFORNIA UNIV BERKELEY DEPT OF CHEMICAL ENGINEERING
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Photoconductivity measurements were carried out on plasma polymerized styrene PPS in vacuo, in air and in subsequently re-evacuated conditions. Samples with two gold electrodes Au-PPS-Au and gold-aluminum electrodes Au-PPS-Al were used. Positive short circuit photocurrents were observed in both types of specimens. In the case of Au-PPS-Au, photocurrent threshold was about 1.6 ev in vacuo for the virgin film, which is attributed to the energy of hole excitation in bulk. Residual free radicals were assumed to be the acceptors in this mechanism. In the case of Au-PPS-Al, electron injection from aluminum was thought to be a more likely mechanism, with an estimated barrier height of approximately 2.6 Ev. Author