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Interface Fermi Level Pinning at Contacts Between PEDOT: PSS and Molecular Organic Semiconductors
Author(s) -
Peisert Heiko,
Petr Andreas,
Dunsch Lothar,
Chassé Thomas,
Knupfer Martin
Publication year - 2007
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200600542
Subject(s) - organic semiconductor , interface (matter) , pedot:pss , condensed matter physics , materials science , fermi level , semiconductor , chemical physics , nanotechnology , optoelectronics , chemistry , physics , composite material , electron , layer (electronics) , quantum mechanics , capillary number , capillary action
Photoemission studies of interfaces between molecular organic semiconductors and the conducting polymer PEDOT: PSS [mixture of PEDOT (poly‐3,4‐ethylenedioxy‐thiophene) and PSS (polystyrenesulfonate)] demonstrate that it is impossible to control the charge injection barriers at such contacts by either a systematic change of the work function of the conducting polymer or that of the organic semiconductor. Instead, these interfaces are, in all cases, characterized by a charge transfer across the interface and a resulting Fermi level pinning. Thus interfacial charge barriers do not explain observed changes in device parameters as a function of the work function of the polymer electrode.