Electron dynamics in quantum dot sensitized solar cells is studied in the nonequilibrium Green's function approach. To solve Kadanoff-Baym (KB) equations we propose a novel method based on two-time spectral expansion (2TSE) of nonequilibrium Green's functions. The method is very efficient for stationary photocurrent calculations. The calculated photocurrent is compared with the computations based on the Markovian master equations. It is shown that the Markovian approximation overestimates photocurrent vs. the numerical solutions of the exact KB equations. The discrepancy can reach as much as one order of magnitude and therefore, the Markovian approximation can overestimate the solar cell efficiency by one order of magnitude.

Correlated electron dynamics in QD sensitized solar cells

245th National Meeting (2013)

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