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Space-Charge-Limited Charge Injection From Ito/Ppv Into A Trap-Free Molecularly Doped Polymer

Published online by Cambridge University Press:  16 February 2011

H. Antoniadis ,
M. Abkowitz ,
B. R. Hsieh ,
S. A. Jenekhe  and
M. Stolka
H. Antoniadis
Affiliation:
NSF Center for Photoinduced Charge Transfer, University of Rochester, Rochester, NY 14627 Xerox Corporation, Webster Research Center, Webster, NY 14580 Department of Chemical Engineering, University of Rochester, Rochester, NY 14627
M. Abkowitz
Affiliation:
Xerox Corporation, Webster Research Center, Webster, NY 14580 Department of Chemical Engineering, University of Rochester, Rochester, NY 14627
B. R. Hsieh
Affiliation:
Xerox Corporation, Webster Research Center, Webster, NY 14580 Department of Chemical Engineering, University of Rochester, Rochester, NY 14627
S. A. Jenekhe
Affiliation:
NSF Center for Photoinduced Charge Transfer, University of Rochester, Rochester, NY 14627 Department of Chemical Engineering, University of Rochester, Rochester, NY 14627
M. Stolka
Affiliation:
NSF Center for Photoinduced Charge Transfer, University of Rochester, Rochester, NY 14627 Xerox Corporation, Webster Research Center, Webster, NY 14580
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 328: Symposium Q – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1993 , 377
Copyright
Copyright © Materials Research Society 1994

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References

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