"Multicrystalline silicon"@en . "Passivated emitter rear cell"@en . . "Photovoltaic manufacturing"@en . "Silicon solar cells"@en . . "PERC"@en . "Laine" . "Black silicon"@en . "Hannu" . "Economics"@en . "242a89b3ceb31731df8d8ef0442dcbc5" . "Hannu S Laine" . "Manufacturing costs"@en . "Photovoltaic"@en .