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Space-Charge-Limited Charge Injection From ITO/PPV Into a Trap-Free Molecularly Doped Polymer

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Abstract

We describe bilayer structures comprised of a poly(p-phenylene vinylene) (PPV) layer and a trap-free diaryldiamine (TPD) doped in polycarbonate (PC) layer, sandwiched between indium-tin-oxide (ITO) and aluminum (Al) contacts. Two critical phenomena in the operation of polymer based electroluminescent devices, interface injection and carrier range, are investigated. It is established that the ITO/PPV contact is capable of sustaining dark current under trap-free space-charge-limited (TFSCL) conditions into a hole transporting TPD:PC layer. TFSCL currents are not observed in devices without the PPV layer. Upon increasing the thickness of the PPV layer a deviation from the TFSCL regime is observed which is attributed to trapping of the injected holes within PPV. These observations suggest a novel method for estimating the trapping mobility-lifetime product µτ for holes in PPV. By this means we estimate µτ ~ 10−9 cm2/V.

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Authors and Affiliations

  1. NSF Center for Photoinduced Charge Transfer, University of Rochester, Rochester, NY, USA

    H. Antoniadis, M. Abkowitz, B. R. Hsieh, S. A. Jenekhe & M. Stolka

  2. Xerox Corporation, Webster Research Center, Webster, NY, 14580, USA

    H. Antoniadis, M. Abkowitz, B. R. Hsieh & M. Stolka

  3. Department of Chemical Engineering, University of Rochester, Rochester, NY, 14627, USA

    H. Antoniadis & S. A. Jenekhe

Authors
  1. H. Antoniadis
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  2. M. Abkowitz
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  3. B. R. Hsieh
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  4. S. A. Jenekhe
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  5. M. Stolka
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Antoniadis, H., Abkowitz, M., Hsieh, B.R. et al. Space-Charge-Limited Charge Injection From ITO/PPV Into a Trap-Free Molecularly Doped Polymer. MRS Online Proceedings Library 328, 377–382 (1993). https://doi.org/10.1557/PROC-328-377

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  • DOI: https://doi.org/10.1557/PROC-328-377

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