Method for forming solar cell contacts and interconnecting solar

Batteries: thermoelectric and photoelectric – Photoelectric – Panel or array

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136256, 437 2, 437188, 257431, 257734, H01L 3105, H01L 310224, H01L 3118

Patent

active

051786850

ABSTRACT:
Photovoltaic cells with silver-rich thick film electrical contacts having superior thermal aging properties are disclosed. The silver-rich contacts are formed by firing a silver ink or paste wherein substantially all of the silver in the ink or paste before firing is in the form of spherical particles. Preferably inter-cell connections to the contacts are accomplished using a tin and silver solder paste comprising between about 96% tin/4% silver and 98% tin/2% silver. Solar cells having contacts incorporating the present invention exhibit the capability of withstanding temperatures in the range of 150.degree. C. with little or no thermal degradation of contact peel strength in the region of the solder bonds.

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