Relative energetics at the semiconductor/sensitizing dye/electrolyte interface

Article Abstract:

The changes involved in the reduction-oxidation potential of different adsorbed sensitizing dyes relative to the potentials of the semiconductor and the electrolyte solution were investigated using chemical oxidation, potential-dependent photoluminescence and spectro-electrochemical reduction. The reduction-oxidation potentials of the dyes under study were independent of pH in solution but eventually acquired a pH dependence that ranged from 21 to 53 mV per pH unit upon adsorption to an oxide surface. The adsorption-induced potential changes were dependent on both the structure of the dye and the composition of the electrolyte.

Research, Chemistry, Oxidation-reduction reaction, Oxidation-reduction reactions, Semiconductors, Adsorption, Surface chemistry, Electrolytes, Dyes and dyeing, Dye chemistry

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Substitutional n-type doping of an organic semiconductor investigated by electron paramagnetic resonance spectroscopy

Article Abstract:

Electron paramagnetic resonance (EPR) and optical spectroscopy were used to characterize the doping process in a liquid crystal perylene dimide, PPEB. Studies of the dopant solutions indicated that a small fraction of the dopant was reversibly quenched by an unknown impurity.

Usage, Electric properties, Organic semiconductors, Electron paramagnetic resonance

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