Chemical structure of the investigated polyspirobifluorene polymers. The contents of each unit are for homopolymer 1, and and for copolymer 2, and .
Cyclic voltammogram for the oxidation of a thin film of polymer 1 at a scan rate of in acetonitrile with tetrabutylammonium perchlorate as supporting electrolyte. The dashed line indicates the position of the couple used as reference.
Device configuration for sensitized charge-carrier generation used in the present TOF experiments. The PDI layer consists of an alkyl-substituted perylene-diimide derivative.
Representative room-temperature TOF hole transients of polymer 1 at an electric field of and of polymer 2 at . The signal of polymer 2 is offset to the signal of polymer 1.
Variation of hole mobility with electric field and temperature of polymer 1. The lines represent the linear fits to the experimental data.
Variation of hole mobility with electric field and temperature of copolymer 2. The lines represent the linear fits to the experimental data.
Semilogarithmic plot of the zero-field mobility against for polymers 1 and 2. The lines represent the linear fit to the data for temperatures higher than for polymer 1 and for polymer 2.
The slope of the vs dependence against for polymers 1 and 2 plotted to extract the constant and the positional disorder parameter . The lines represent the linear fits to the data. Note that the linear fit for polymer 1 intersects with the abscissa at negative values close to zero.
Summary of the derived fitting parameters for polymer 1 and copolymer 2.
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