On the electrochemical impedance of InP and GaAs electrodes in indifferent electrolyte. Part 1. Analytical description of the frequency dispersion
文献情報
Simple electrostatic theory describes a blocking semiconductor∣electrolyte contact as a perfect capacitor. This idealized behaviour of the interface does not correspond to the experimental fact that the capacitance of a semiconductor∣electrolyte contact very often depends on the measuring frequency (so-called ‘frequency dispersion’). The nature of this discrepancy remains largely unknown. In this paper, we show for n-InP and n-GaAs that the imperfect capacitor which a semiconductor∣electrolyte contact constitutes may be described as a parallel connection of a perfect capacitor, corresponding to the semiconductor space-charge layer, and a constant-phase element, describing the frequency dependence of the capacitance of the semiconductor∣electrolyte contact. Based upon the proposed equivalent circuit, the various interpretations of the frequency dispersion found in the literature are discussed. It is concluded that surface states may play a major role in the dispersion phenomenon.
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掲載誌
Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.












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