VENDORVIEW
v = 420 cm per minute Tmax = 905° C
v = 500 cm per minute Tmax = 920° C
Fig 8: El-Rs Images of Solar Cells Fired at Different Speeds and Temperatures
v = 580 mm per minute Tmax = 950° C
47
Tmax = 905° C
Tmax = 920° C
Tmax = 950° C Fig 9: El-Rs Images of Solar Cells Fired at Identical Speed (420 cm per minute) and Different Temperatures
temperature at identical conveyor speed. Deterioration of series resistance begins at the edges of the wafer, and continues into the middle (see fig 9).
The greater the extent to which temperature exceeds the optimum value, the greater the danger is that the solar cells will be over-fired, short-circuit current and series resistance will be increased, fill factor will be reduced (see Fig 10a through d), and scattering of the individual values will be generally increased.
The results indicate just how important it is to have a fast firing system with a large process window. Different silicon qualities and metallizing systems necessitate individualized optimization of the firing process.
RFS fast firing systems provide enough flexibility to assure an optimized contacting process for all mating materials.
Fig 10a through d: Characteristic Values for Solar Cells Fired at Identical Speed and Two Different Temperatures
www.solar-pv-management.com Issue VI 2010
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