Dimension:b158.75mm*158.75mm±0.5mm
Thichness: 180±30um
Front: 5*0.7±0.1mm busbars (sliver)，120 finger grids，
Blue anti-reflecting coating (silicon nitride)， 13.8% hollow ratio
Back(+) :Width of back electrode (Silver)1.8±0.3mm, Back
surface field(aluminum)
