Fill factors of dye-sensitized solar cells

18 12 2009

The figure shows the fill factors as a function of the open-circuit voltage of different solar cell types at 1 sun and  T = 300 K.  The lines is the theoretical expression for Shockley diode at the indicated value of the diode quality factor, m. For a DSC m is the reciprocal of the effective recombination order. The data points are for three dye-sensitized solar cells (DSC) of very high quality, for a normal DSC with standard N719 (in this case the series resistance ffect is subtracted), and for a BHJ. For comparison, the data points of record solar cells of different technologies are given.

The fill factors of DSC were discussed in a recent paper.

Juan Bisquert and Iván Mora-Seró, “Simulation of Steady-State Characteristics of Dye-Sensitized Solar Cells and the Interpretation of the Diffusion Length” (2009).

The idea of this paper was to show that recombination order in DSC different than 1, in general, and the implications of this important fact. There is a connection between the fill factor, the effective recombination order, and the variation of the diffusion length with the voltage.

Reference of the solar cells in the graphic:

Martin A. Green, Keith Emery, Yoshihiro Hishikawa, Wilhelm Warta, “Solar cell efficiency tables (Version 34)”

-Dye Z991 (12.2%, Grätzel, M. 2009, presented at MRS Fall Meeting in Boston)

-Dye C106 (11.4%, Cao, Y.; Bai, Y.; Yu, Q.; Cheng, Y.; Liu, S.; Shui, D.; Gao, F.; Wang, P. “Dye-Sensitized Solar Cells with a High Absorptivity Ruthenium Sensitizer Featuring a 2-(Hexylthio)thiophene Conjugated Bipyridine”. J. Phys. Chem. C 2009, 113, 6290–6297).

-Dye D131 (5.1%, Ogura, R. Y.; Nakane, S.; Morooka, M.; Orihashi, M.; Suzuki, Y.; Noda, K. “High-performance dye-sensitized solar cell with a multiple dye system “. Appl. Phys. Lett. 2009, 94, 073308).