Photoconduction decay in zeaxanthin in a sandwich cell has been measured as a function of applied field and temperature in longer time domains (5–35s). The results show that the gap states decrease exponentially with characteristic temperatureTc≈450 K at an applied field of 1·77×103 V/cm. When the sample temperature is 293 K,Tc is found to be voltage-dependent and follows the empirical relationTc≈A exp (−bV). The field effect onTc is suggested to arise from the field effect on trapping rate. Light intensity dependence of photocurrent satisfies the power lawIph∞IBγ with γ varying between 0–61 and 0–58 depending on the applied voltage at low excitation light intensity. At high intensities γ=1·2.Tc values evaluated from decay and light intensity dependence measurements show excellent correlation.
Volume 135, 2023
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