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New Generation Silicon Solar Cells

EWT/MWT

New Generation Silicon Solar Cells

Front (left) and rear (right) of a EWT-solar cell. The front contacts

are brought  to the rear  of the solar cell by many  dots.

Emitter Wrap through (EWT)

Emitter on the front surface is wraped with the rear surface by little holes

Edges of the holes are also emitter areas, which transport emitter current

Power-conveying busbars and the grid are moved to the rear surface

Use double sided carrier collection (n+pn+) increases the efficiency

100µm holes are made by laser

EWT- cell with n+pn+ - structure

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