Wet chemical process for back side smoothing of industrially manufactured solar cells

The efficiency of solar cells can be increased simply and effectively by smoothing the back side through wet chemical etching. A smooth surface structure makes the back side highly reflective. During smoothing, the parasitic emitter on the back side is etched away as well, while a viscous paste protects the microscopic pyramidal structure on the front side. The process utilizes solely inexpensive and established technologies in industrial manufacturing of solar cells.

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