Fill factor in the context of solar cell technology it is defined as the ratio (given as percent) of the actual maximum obtainable power, (Vmp x Jmp) to the theoretical (not actually obtainable) power, (Jsc x Voc).
The open circuit voltage (Voc) is the maximum voltage, when the circuit resistance has caused any current to cease flowing.
The short circuit current density (Jsc) is the maximum current through the circuit when there is no resistance (and hence no voltage).
The fill factor (FF), is thus defined as (VmpJmp)/(VocIsc), where Jmp and Vmp represent the current density and voltage at the maximum power point, this point being obtained by varying the resistance in the circuit until J x V is at it's greatest value.
Fill Factor
When you create a clustered index, the data in the table is stored in the data pages of the database according to the order of the values in the indexed columns. When new rows of data are inserted into the table or the values in the indexed columns are changed, Microsoft® SQL Server™ 2000 may have to reorganize the storage of the data in the table to make room for the new row and maintain the ordered storage of the data. This also applies to nonclustered indexes. When data is added or changed, SQL Server may have to reorganize the storage of the data in the nonclustered index pages. When a new row is added to a full index page, SQL Server moves approximately half the rows to a new page to make room for the new row. This reorganization is known as a page split. Page splitting can impair performance and fragment the storage of the data in a table.
Other uses of the term
In vision science, the fill factor is the ratio of view areas to the object visible areas.
For optical micro-lens arrays, the fill factor is defined as the ratio of the active refracting area to the total contiguous area occupied by the lens array.
