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New Generation Silicon Solar Cells

5.5 Solar cell contacts

New Generation Silicon Solar Cells

Disadvantage:

Manufacturing process is very complex

Metal wrap throug (MWT)

à

Absence of the bus bars (on the rear side) connection by holes

à

Less serial resistance losses because of interconnection of the modules

 on the back

FF ~77%; efficiency ~ 16%

Advantages:

Eliminate grid obscuration no high doping  high Isc high efficiency

n+pn+- structure use lower quality solar grade silicon

Uniform optical appereance improves asthetics

Silicon solar cell < 200μm

Efficiency around 18%

gain in active cell area

Diffusion length can be reduced to the half

MWT-cell

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