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Injection‐induced De‐doping in a Conducting Polymer during Device Operation: Asymmetry in the Hole Injection and Extraction Rates
Author(s) -
Chia P.J.,
Chua L.L.,
Sivaramakrishnan S.,
Zhuo J.M.,
Zhao L.H.,
Sim W.S.,
Yeo Y.C.,
Ho P. KH.
Publication year - 2007
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200700086
Subject(s) - doping , polyelectrolyte , conductance , extraction (chemistry) , materials science , asymmetry , polymer , joule heating , conductive polymer , charge (physics) , electrical resistivity and conductivity , chemical physics , analytical chemistry (journal) , nanotechnology , chemical engineering , polymer chemistry , optoelectronics , condensed matter physics , chromatography , physics , chemistry , composite material , quantum mechanics , engineering
A mechanism is described that can alter the doping level of conducting polymers during normal electrical injection, which arises from differential charge extraction/ injection into transport sites, and which is likely to be an intrinsic feature of the hopping transport itself. This and not Joule heating is the cause of the conductance decay in PEDT:PSS at strong electrical injection, in which the polyelectrolyte counter‐ion also plays a key role. Neutral (non‐acidic) PEDT:PSS is more stable in this regard.