Abstract
This work presents metal assisted etching for surface texturing of industrial size String Ribbon wafers. Palladium serves as a catalyst for chemical etching in an aqueous solution containing hydrofluoric acid and nitric acid. String Ribbon solar cells textured by metal assisted etching show a decreased effective reflection ΔReff = 16%rel compared to untextured solar cells. The decreased reflection results in a solar cell efficiency increase Δηcell = + 0.4%abs. The improvement in solar cell efficiency is mainly due to an increase ΔJsc = + 0.9 mA/cm2 in the average solar cell short circuit current density Jsc and an increase ΔFF = 0.7%abs in fill factor FF. Due to enhanced optical coupling, the efficiency increases additional Δηmodule ≈ 0.1%abs after encapsulation of the cells behind glass.
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