“Solid state charge trapping”: Examples of polymer systems showing memory effect

Analysis of Conjugated Polymers Conductivity by in situ Electrochemical‐Conductance Method

“…These positive charges are formed during the electropolymerization or p ‐doping at high potentials . This phenomenon is called in the literature as charge trapping . Since the presence of the charges trapped causes a coulombic repulsion between the mobile charges, their presence affects the conductivity value.…”

“…[101] This phenomenon is called in the literature as charge trapping. [146][147][148][149] Since the presence of the charges trapped causes a coulombic repulsion between the mobile charges, their presence affects the conductivity value. Therefore, potentiodynamic in-situ electrochemical-conductance allows to discern between the ndoping process (where conductivity is present) and the reduction of these charges trapped, with the concomitant expulsion of their counter ions (where no conductivity is observed).…”

Poly(3-hexylthiophene) Grafting and Molecular Dilution: Study of a Class of Conjugated Graft Copolymers

“…A low amount of spin centres also persists at these potentials, registered by EPR spectroelectrochemistry. The observed residual conductance, indicates that complete dedoping of the oxidised polymer segments does not take place, which could be interpreted as a symptom of charge trapping [ 35 , 36 , 37 ]. For a typical conjugated polymer, at such negative potentials, we would expect to see a gradual decline in conductance of the polymer film (due to reduction of positive charge carriers in the polymer film) rather than the almost unchanging and relatively high observed conductance value.…”

Electrical conductivities and Li ion concentration-dependent diffusivities, in polyurethane polymers doped with lithium trifluoromethanesulfonimide (LiTFSI) or lithium perchlorate (LiClO4)

“…This can directly favor electrical conduction through ion transport. The carriers generated in doped conducting polymers are self-trapped by the conjugated polymeric chains in the form of polarons or bipolarons [8]. Ion hopping or tunneling conduction between these sites have been proposed as the primary transport mechanisms in conducting polymers [9].…”

“…Typical VTF plots for (a) 0.25% LiClO 4 -doped polyurethane and (b) 1.5% LiClO 4 -doped polyurethane. (τ−δ/ τ−δ/3) (s 3 ) X 108 ln Intensity (arb unit) NMR diffusivity plot for 3.5% LiTFSI-doped polyurethane. The ordinate is the coefficient of the diffusivity D in the argument of the exponential in the Stejskal-Tanner Eq.…”