Fill factor (solar cell)
The fill factor describes the quotient of the maximum power of a solar cell at the maximum power point and the product of open circuit voltage and short circuit current . The fill factor is therefore dimensionless .
In this diagram, the fill factor is to be considered as the ratio of blue to yellow area. The ideal solar cell represents a constant current source (up to its maximum voltage), its current-voltage diagram forms a rectangle and the fill factor is equal to 1. Therefore, it is a measure of the quality of the cell in addition to short-circuit current and open-circuit voltage. The lower the fill factor, the lower the efficiency of the solar cell, since part of the generated power is lost in the internal resistance of the cell.
With crystalline solar cells values between 0.75 and 0.85 are achieved, with amorphous cells the fill factor is between 0.5 and 0.7.
Individual evidence
- ↑ photovoltaiksolarstrom.com: The fill factor in photovoltaics: A measure of the quality of the solar cell , accessed on December 14, 2017