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New Generation Silicon Solar Cells

5.3 Reflection

New Generation Silicon Solar Cells

1. Anti reflection layer

One or more layers reduction from 30-35% to 5%-10%

Mainly 600nm transmission

Silicon nitride or transparent layers, e.g. SiO2; TiO2; Ta2O5

ITO can be used as anti reflection layer and at the same time as a transparent contact

Double anti reflection layers ZnS or MgF2

2. Texturing (light trapping)

Use NaOH, KOH in etching baths

The etching works anisotropic 2μm - 10μm

big pyramids on (100) oriented crystall planes

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