Analysis of photovoltage decay transients in dye-sensitized solar cells

Reference:

Walker, A. B., Peter, L. M., Lobato, K. and Cameron, P., 2006. Analysis of photovoltage decay transients in dye-sensitized solar cells. Journal of Physical Chemistry B, 110 (50), pp. 25504-25507.

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Abstract

It is shown that application of the so-called quasi-static approximation greatly simplifies the theoretical treatment of the open circuit photovoltage decay of dye-sensitized nanostructured solar cells (DSCs), since it removes the need to treat the kinetics of trapping and detrapping explicitly and leads to a straightforward analytical solution in the case of an exponential trap distribution. To identify the conditions under which the quasi-static approach is valid, transients calculated using the quasi-static approximation are compared with the results of numerical calculations that treat trapping and detrapping of electrons explicitly. The application of the quasi-static approach to derive the rate constant for the back-reaction of electrons from experimental photovoltage decay data is illustrated for an optimized DSC.

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