Time evolution of the electric field at electrode interfaces with conducting polymers

Taylor, D. M.; Morris, D.; Cambridge, J. A.
November 2004
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5266
Academic Journal
Time-resolved scanning Kelvin probe microscopy (SKPM) and Raman microscopy have been used to investigate processes occurring at the interface between indium tin oxide (ITO) electrodes and inkjet printed polyethylenedioxythiophene: polystyrene sulphonic acid (PEDOT:PSS). SKPM reveals a slow, reversible polarisation process (time constant ∼12 s) occurring at the electrodes caused by the drift of Na+ and/or H+ ions in the polymer. Raman microscopy shows that the resulting field enhancement at the electrodes increases the concentration of holes in the polymer at the anode, while at the cathode there is a significant reduction in hole concentration. Such effects have implications for both the short- and long-term stability of devices utilising PEDOT:PSS.


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