TITLE

The effect of UV ozone treatment on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)

AUTHOR(S)
Helander, M. G.; Wang, Z. B.; Greiner, M. T.; Liu, Z. W.; Lian, K.; Lu, Z. H.
PUB. DATE
October 2009
SOURCE
Applied Physics Letters;10/26/2009, Vol. 95 Issue 17, p173302
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The interface between ultraviolet (UV) ozone treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and N,N′-diphenyl-N,N′-bis-(1-naphthyl)-1-1′-biphenyl-4,4′-diamine (α-NPD) was investigated using single carrier hole-only devices and in situ ultraviolet and x-ray photoelectron spectroscopy to elucidate the implications for device applications. It is found that although the work function of PEDOT:PSS is increased by UV ozone treatment, the injection barrier to α-NPD is in fact increased, resulting in lower current density in devices. The apparent increase in work function is attributed to a metastable surface dipole as a result of UV ozone treatment, which does not significantly influence the energy-level alignment.
ACCESSION #
44909858

 

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