Polymeric conducting anode for small organic transporting molecules in dark injection experiments

S. C. Tse, S. W. Tsang, S. K. So

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Poly(3,4-ethylenedioxythiophene) doped with polystrenesulphonicacid (PEDOT:PSS) is used as a hole-injecting anode for small organic holetransporters in current-voltage (JV) and dark injection space-charge-limitedcurrent (DI-SCLC) experiments. The hole transporters under investigation arephenylamine-based 4,4′ ,4″-tris(N-3-methylphenyl-N-phenyl-amino) triphenylamine(MTDATA), N,N′-diphenyl-N,N′-bis(1-naphthyl) (1,1′-biphenyl)-4,4′diamine (NPB),and N,N′-diphenyl-N, N′-bis(3-methylphenyl)(1,1′-biphenyl)-4,4′diamine (TPD).Clear DI-SCLC transient peaks were observed over a wide range of electricfields in all cases. For MTDATA and NPB, hole mobilities evaluated by DIexperiments are in excellent agreement with mobilties deduced from independenttime-of-flight technique. It can be concluded that, for the purpose of JV andDI experiments, PEDOT:PSS forms an Ohmic contact with MTDATA and a quasi-Ohmiccontact with NPB despite the relatively low-lying highest occupied molecularorbital of the latter. In the case of TPD, hole injection from PEDOT:PSSdeviates substantially from Ohmic injection, leading to a lower than expectedDI-extracted hole mobility. The performances of other hole-injecting anodes forDI experiments were also examined.

Thisarticle may be downloaded for personal use only. Any other use requires priorpermission of the author and AIP Publishing. This article appeared in S.C. Tse, S. W.Tsang, S.K. So; Polymeric conducting anode for small organic transporting molecules indark injection experiments. J. Appl. Phys. 15 September 2006; 100 (6):063708. https://doi.org/10.1063/1.2348640 and may befound at https://pubs.aip.org/aip/jap/article/100/6/063708/370162/Polymeric-conducting-anode-for-small-organic.


Original languageEnglish
Article number063708
Number of pages5
JournalJournal of Applied Physics
Issue number6
Publication statusPublished - Sept 2006

Scopus Subject Areas

  • Physics and Astronomy(all)


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