4 FAQs about Photovoltaic panel diffusion etching

What is etching process in solar cell processing?

Etching is a process which removes material from a solid (e.g., semiconductor or metal). The etching process can be physical and/or chemical, wet or dry, and isotropic or anisotropic. All these etch process variations can be used during solar cell processing.

Can plasma-based Si etching be used for solar cells?

An emerging field is that of plasma-based Si etching processes for solar cells. Plasma texturing has proved particularly suitable for advanced solar cell structures and new low-cost substrates. Part of this work was financially supported by the European Commission with the FP6 project Crystal Clear (SES6-CT2003-502583).

How are solar cells etched?

The solar cells are transported just above the etch bath level (typically an aqueous solution based on HNO3 and HF), so that only the rear side is etched, leaving the emitter at the front intact. This process is usually combined with phosphorous glass removal in the same wetbench, just prior to the rear side etch.

What is Si etch process?

This article first appeared in Photovoltaics International journal's first edition in August 2008. Si etch processes are vital steps in Si solar cell manufacturing. They are used for saw damage removal, surface texturing and parasitic junction removal.

View/Download Photovoltaic panel diffusion etching [PDF]

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