Doping of semicrystalline conjugated polymers: dopants within alkyl chains do it better

Doping of Conjugated Polythiophenes with Alkyl Silanes

DOI: 10.1002/adfm.200900120 A strong modification of the electronic properties of solution-processable conjugated polythiophenes by self-assembled silane molecules is reported. Upon bulk doping with hydrolized fluoroalkyl trichlorosilane, the electrical conductivity of ultrathin polythiophene films increases by up to six orders of magnitude, reaching record values for polythiophenes: (1.1 0.1) ...

Field-assisted ionization of molecular doping in conjugated polymers

The fieldand temperature dependence of the charge transport in solution-processed poly[2-methoxy-5-(20-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) doped with tetrafluoro-tetracyanoquinodimethane (F4-TCNQ) is investigated. Conventional charge transport models based on a densityand field-dependent mobility in combination with a constant background hole density from the dopant do not explain th...

Do nurses do it better?

Electromechanical instability in semicrystalline polymers

When a layer of a semicrystalline polymer is subject to a tensile force in its plane and a voltage through its thickness, the deformation of the layer is initially homogeneous, but it then localizes. The electromechanical instability sets in when the force and the voltage reach critical conditions. The critical conditions are determined in this paper and are related to the following two special...

Enthalpy recovery in semicrystalline polymers

Constitutive equations are derived for enthalpy recovery in polymeric glasses after thermal jumps. The model is based on the theory of cooperative relaxation in a version of the trapping concept. It is demonstrated that some critical temperature Tcr and some critical degree of crystallinity fcr exist in a semicrystalline polymer above which the energy landscape becomes homogeneous and structura...