From the dedoped to doped state the concentration of charge balanced anions and cations roughly doubled to 0.048 anion-cation pairs per repeat unit, and the concentration of uncompensated anion dopants nearly tripled to 0.82 per repeat unit (the second left column in Figure ). The presence of charged balanced ions appears to represent a permanent population due to passive electrolyte swelling of the film. The increase in charge balanced anion-cation pairs in the doped state reflects an increase miscibility of the polymer and electrolyte when the polymer is charged.