VENDORVIEW


Fast firing advantage


Dr. Hans Bell, Jochen Burkhardt and Harald Müller of the Rehm Group discuss the RFS Fast Firing Systems and how it provides flexible temperature profiling through to high energy efficiency in assisting improving PV development.


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Figure 1: The RFS Fast Firing System


hen it comes to safeguarding quality and yield in the


manufacture of solar cells, firing is a critical process step. Initially, the organic binders in the metallic pastes which are printed onto the solar cell and subsequently dried during firing, are burned. The second step of the firing process requires the remaining metals to be sintered (fired) to the silicon cell at high temperatures.


During sintering, various reactions take place amongst the bonding partners, which raise the potential for negative side effects.


In order to minimize this, steep heating and cooling gradients are generally utilized to keep the sintering step very short, as well as short dwell times of typically less than ten seconds at high sintering temperatures.


The RFS Fast Firing System


In developing the RFS fast firing system to make an important contribution to effective solar cell metallization lines, we placed considerable


Figure 2: Temperature Profile for a Fast Firing Process (drying, burning and firing)


emphasis on prioritizing operator requirements. The result is a system that achieves excellent availability and high throughput rates, while also being inexpensive to operate.


Features such as ease of maintenance, accessibility of system components and minimal consumption of resources have been given special attention on the user-friendly system.


www.solar-pv-management.com Issue VI 2010


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