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OK Int'l Launches Enhanced PV Soldering Systems
Enhanced PV tabbing soldering system.
Garden Grove, CA — OK International has launched a new soldering system for PV tabbing and bussing applications proven to reduce micro cracking. The PS900 with specially designed hoof tip geometry optimizes the power delivered to the solder joint while its temperature-sensitive heater ensures low temperature soldering, thus minimizing thermally-induced stresses on cell surfaces.

The PS 900 incorporates the company's patented SmartHeat® Technology that will produce and maintain a specific, self-regulated temperature with a heater that requires no calibration and responds directly to thermal loads.

There are two suitable solder alloys utilized for solar cell soldering application: Sn96Ag4 with a melting point of 221°C, or bismuth-containing Bi58Sn42 with a melting point of 138°C. Proper soldering will result in an intermetallic layer that is 1 to 2µm thick, which demands precise time and temperature control during the solder joint formation.

Micro cracking of delicate solar cell substrates is a common defect that can occur during PV tabbing and bussing soldering processes. Reducing the soldering temperature to a minimum prevents the cells from being subjected to mechanical or thermal stresses. During the soldering operation, differential thermal expansion of the copper and the silicon elements can occur at temperatures greater than 300°C. This differential can result in the formation of micro-cracks that may not be detected during the manufacturing process and result in reduced field lifespan.

The new soldering system with specially designed STV-DRH440A hoof-tip geometry optimizes the power delivered to the solder joint, thus providing high performance efficiency with increased tip life. Its temperature-sensitive "T" heater series ensures low temperature soldering and thus minimizes thermally induced stresses on the surface of the solar cells.

Contact: OK International, 12151 Monarch St., Garden Grove, CA 92841 714-799-9910 fax: 714-799-9533 Web:
http://www.okinternational.com/literature

See at APEX Booth #1482.

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