E.i. Dupont De Nemours and Company

Ben Whittle

Kenneth Warren Hang

Richard John Sheffield Young

Giovanna Laudisio

Alistair Graeme Prince

Gary Coultart

A process for the formation of an electrically conductive silver back electrode of a PERC silicon solar cell comprising the steps:

Process for the formation of a silver back electrode of a passivated emitter and rear contact silicon solar cell

An aluminum paste comprising particulate aluminum, an organic vehicle and glass frit selected from (i) lead-free glass frits with a softening point temperature in the range of 550 to 611&#xb0; C. and containing 11 to 33 wt.-% of SiO, &#x3e;0 to 7 wt.-% of AlOand 2 to 10 wt.-% of BOand (ii) lead-containing glass frits with a softening point temperature in the range of 571 to 636&#xb0; C. and containing 53 to 57 wt.-% of PbO, 25 to 29 wt.-% of SiO, 2 to 6 wt.-% of AlOand 6 to 9 wt.-% of BO, useful in the production of aluminum back electrodes of PERC silicon solar cells.

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Bristol, United Kingdom

Ben Whittle