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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/102/01/0073-0080

    • Keywords

       

      Organic photoconductors; zeaxanthin; photoconductivity decay; exponential trap distribution; field dependence; temperature dependence

    • Abstract

       

      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.

    • Author Affiliations

       

      Dilip Ghosh1 Prabir Pal1 T N Misra1

      1. Department of Spectroscopy, Indian Association for the Cultivation of Science, Calcutta - 700 032, India

    • Dates

       
      Published
      February 1990
      Manuscript received
      19 June 1989
      Manuscript revised
      15 November 1989

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