Detailed Analysis of a Redox Stabilized Liquid Junction Solar Cell: Application to the Cell

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Abstract
The factors determining the response of a stabilized liquid junction solar cell are obtained by simultaneous current and impedance measurements, in dark and under illumination. Impedance data give the energy diagram of the junction (bandedges, surface states…). A model is developed that describes the kinetics of charge transfer and the mass transport effect under various working conditions. Moreover a simple method to estimate the reorganization energy λ of the redox couple in solution is presented. In the case of the cell a high surface‐state density (∼1013cm−2), located at 0.4 eV below the conduction band, is found. It is connected with a shift of the flatband potential under illumination. As a result the maximum theoretical open‐circuit voltage is reduced, and it appears that the performances of the cell are limited by this shift and by charge transfer kinetics at the semiconductor‐electrolyte interface.

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