Journal of Materials Science

, Volume 26, Issue 17, pp 4774–4786 | Cite as

Organic photoconductors: Dark and photoconduction studies in two p-dimethylamino styryl dyes derived from pyridine-2 and pyridine-4

  • P. K. Narasimharaghavan
  • Hari Om Yadav
  • T. S. Varadarajan
  • L. N. Patnaik
  • S. Das


Results of our experiments on the dark and photoconduction studies in two p-dimethylamino styryl dyes derived from pyridine-2 (PDMS-P2) and pyridine-4 (PDMS-P4) in their pure form without any dopant or additive are reported. Measurements on surface-type (raster pattern) cells show that the dark and photocurrents are dependent on the applied potential, temperature, and the photocurrent on the intensity of the incident radiation and the wavelength. Action spectra of the samples could not be recorded as the intensity of the monochromatic radiation from the monochromator reaching the sample was too low to induce any noticeable photocurrent. The compounds show a low dark conductivity. The dark and photocurrents show a perfect ohmic behaviour in the temperature range studied (288–328 K). Since photoconduction could only be observed in a vacuum, this clearly indicates that the compounds are n-type semiconductors. The observed rise and decay kinetics of the photocurrents indicate the presence of traps in the forbidden zone. The dyes show an enhanced photoconduction on illumination with visible radiation only. The marked open circuit voltage and the short-circuit current observed in these compounds indicate a possible application in solar photovoltaics.


PDMS Phthalocyanine Solar Photovoltaic Astacin Photoconductive Gain 


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Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • P. K. Narasimharaghavan
    • 1
  • Hari Om Yadav
    • 1
  • T. S. Varadarajan
    • 1
  • L. N. Patnaik
    • 2
  • S. Das
    • 2
  1. 1.Centre for Advanced Studies in Applied Chemistry, Department of Chemical TechnologyUniversity of BombayBombayIndia
  2. 2.Department of ChemistryRavenshaw CollegeCuttackIndia

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