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Proceedings Paper

Nearly ohmic injection contacts from PEDOT:PSS to phenylamine compounds with high ionization potentials
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Paper Abstract

We demonstrate that poly(3,4-ethylenedioxythiophene) doped with polystrenesulphonic acid (PEDOT:PSS) can act as an excellent hole injection material for small organic charge transporters. With PEDOT:PSS as a conducting anode, it is possible to achieve nearly Ohmic hole injection contacts to phenlyamine-based materials with HOMO values of up to 5.5 eV. In current-voltage experiment, the PEDOT:PSS anode can achieve nearly Ohmic hole injection to NPB (N,N'- diphenyl-N,N'-bis(1-naphthyl)(1,1'-biphenyl)-4,4'diamine), and TPD (N,N'-diphenyl-N,N'-bis(3-methylphenyl) (1,1'- biphenyl)-4,4'diamine). Meanwhile, dark-injection space charge limited current (DI-SCLC) transients are clearly observed and are used to evaluate the charge-carrier mobility of these phenylamine compounds. The carrier mobilities extracted by DI-SCLC are in excellent agreement with independent time-of-flight (TOF) technique. It is conceivable that PEDOT:PSS can be used as a general conducting anode for the electrical characterizations of organic materials that require Ohmic hole contacts.

Paper Details

Date Published: 5 December 2006
PDF: 9 pages
Proc. SPIE 6333, Organic Light Emitting Materials and Devices X, 63331P (5 December 2006); doi: 10.1117/12.682442
Show Author Affiliations
S. C. Tse, Hong Kong Baptist Univ. (Hong Kong China)
S. W. Tsang, Hong Kong Baptist Univ. (Hong Kong China)
S. K. So, Hong Kong Baptist Univ. (Hong Kong China)


Published in SPIE Proceedings Vol. 6333:
Organic Light Emitting Materials and Devices X
Zakya H. Kafafi; Franky So, Editor(s)

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