A method for assisting laser precision processing of solar cells

Abstract

This invention belongs to the field of solar cell laser processing technology, specifically relating to a method for precise laser-assisted processing of solar cells. The invention involves preparing a transparent conductive film on the surface of a non-planar substrate, then fabricating a metal layer on the surface of the transparent conductive film using thermal evaporation, PS microsphere etching, or metal nanoparticle colloid coating. A flat-top laser is then used to process the metal layer, utilizing the evanescent wave characteristics of the surface plasmon resonance effect to modify the transparent conductive film. Finally, the metal layer is recovered by dissolving it with an organic acid. This invention utilizes the evanescent wave characteristics of the surface plasmon resonance effect to achieve localized focusing of laser energy, precisely heating the shallow surface material. The small range of the surface plasmon effect allows heating only the shallow surface layer, thus avoiding thermal damage to the subsurface or bottom substrate, achieving precise surface modification. It is applicable to laser processing of different transparent materials and different substrate types, exhibiting strong process adaptability.

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