Alkaline Etching of Silicon Surfaces NaOH (2 Wt%) / IPA (6 wt%) / DIH 2 O Temperature : 82 0 C Etching times : 25, 30, 35 and 40 minutes respectively Average height of pyramids : ~3, 5, 7 and 10 micrometers approximately Fabrication of Crystalline Silicon Solar Cell with Emitter Diffusion, SiNx Surface Passivation and Screen Printing of Electrode.