期刊
ORGANIC ELECTRONICS
卷 6, 期 1, 页码 21-33出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2005.02.001
关键词
polyaniline; PEDOT; poly(acrylamido-2-methyl-1-propanesulfonic acid); poly(styrenesulfonic acid); poly(acrylamide); photoelectron spectroscopy
A set of polyaniline- and poly(3,4-ethylene dioxythiophene) based materials were studied as hole injection layers in polymer light emitting devices. The choice of polymeric counterion/dopant poly(styrenesulfonic acid), and poly(acrylamido-2-methyl-1-propanesulfonic acid), and poly(acrylamide) blended with polyanitine/poly(acrylamido-2-methyl-1-propanesulfonic acid) was found to influence both work function and film morphology, which in turn affects device performance. The work functions of the polymer films spanned the range of over I eV and the surface region of the films were found to be low in conducting polymer content compared to the bulk. This was particularly the case of the polyaniline/poly(acrylamido-2-methyl-1-propanesulfonic acid) blended with poly(acrylamide) which showed device efficiency equal to that of the poly(3,4-ethylene dioxythiophene)-poly(styrenesulfonic acid) reference. The turn on voltage, however, was significantly larger, likely due to the insulating poly(acrylamide)-rich surface region of the polyaniline/poly(acrylamido-2-methyl-1-propanesulfonic acid)/poly(acrylamide) film. The polymer blend of polyaniline/poly(styrenesulfonic acid) yielded the highest work function (5.5 +/- 0.1 eV). (c) 2005 Elsevier B.V. All rights reserved.
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