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Microscopic and spectroscopic characterization of interfaces and dielectric layers for OFET devices
Author(s) -
Müller K.,
Burkov Y.,
Mandal D.,
Henkel K.,
Paloumpa I.,
Goryachko A.,
Schmeißer D.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200723424
Subject(s) - organic field effect transistor , pedot:pss , materials science , kelvin probe force microscope , dielectric , organic semiconductor , ferroelectricity , x ray photoelectron spectroscopy , gate dielectric , optoelectronics , polymer , semiconductor , transistor , nanotechnology , field effect transistor , layer (electronics) , chemical engineering , atomic force microscopy , voltage , composite material , electrical engineering , engineering
The functionality of organic devices is strongly influenced by their interfaces. We report on new microscopic methods for interface characterization of organic devices in operation mode. With photoemission electron microscopy (PEEM), a direct mapping of charge carrier density is possible. Microscopy in the scanning Kelvin force mode (SKPM) gives information about the local surface potential. In addition to lateral information, depth profiling of interface chemistry is important. As an example, we present a study of the electrode/dielectric layer interface, performed using photoelectron spectroscopy. This interface is of technological relevance for organic memories, based on organic field effect transistors (OFETs). The dielectric part is made of ferroelectric polymers like poly(vinylidene fluoride‐trifluoroethylene) (P(VDF‐TrFE)). We compare aluminium/P(VDF‐TrFE) and PEDOT:PSS/P(VDF‐TrFE) interfaces (PEDOT:PSS is the conductive polymer poly(3,4‐ethylenedioxythiophene):polystyrenesulphonate). Finally we present memory elements consisting of metal ferroelectric insulator semiconductor (MFIS) and OFET structures. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)