Universal photocurrent-voltage characteristics of dye sensitized nanocrystalline TiO$_2$ photoelectrochemical cells

Details Universal photocurrent-voltage characteristics of dye sensitized nanocrystalline TiO$_2$ photoelectrochemical cells Universal photocurrent-voltage characteristics of dye sensitized nanocrystalline TiO$_2$ photoelectrochemical cells

2008-01-28

arxiv.org/abs/0801.4334v1

Physics

Condensed Matter

Other Condensed Matter

5 pages, 3 figs

Scientific paper

10.1103/PhysRevB.79.035308

We propose a new linearizable model for the nonlinear photocurrent-voltage characteristics of nanocrystalline TiO$_2$ dye sensitized solar cells based on first principles and report predicted values for fill factors. Upon renormalization diverse experimental photocurrent-voltage data collapse onto a single universal function. These advances allow the estimation of the complete current-voltage curve and the fill factor from any three experimental data points, e.g., the open circuit voltage, the short circuit current and one intermediate measurement. The theoretical underpinning provides insight into the physical mechanisms responsible for the remarkably large fill factors as well as their known dependence on the open circuit voltage.

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