About How to separate silicon wafers from photovoltaic panels
Pyrolysis and gravimetric separation methods are the most effective, which recovered 91.42 %and 94.25 % silver from crystalline panels and 96.10% silver from CIS PV panels. Yang et al. (2017) used methane sulphonic acid (MSA) with an oxidation agent (hydrogen peroxide) to extract silver from photovoltaic panels.
Pyrolysis and gravimetric separation methods are the most effective, which recovered 91.42 %and 94.25 % silver from crystalline panels and 96.10% silver from CIS PV panels. Yang et al. (2017) used methane sulphonic acid (MSA) with an oxidation agent (hydrogen peroxide) to extract silver from photovoltaic panels.
In the present study, a two-stage heating treatment was conducted to separate the waste crystalline silicon solar panels. The TPT backing material could be recovered integrally by heating at 150 °C for 5 min, which was conducive to further recycling and regeneration.
Conventional recycling methods to separate pure silicon from photovoltaic cells rely on complete dissolution of metals like silver and aluminium and the recovery of insoluble silicon by employing multiple leaching reagents. A common approach that eschews hydrofluoric acid (HF) treatment is the double reagent approach which utilizes nitric acid .
The process flow from silicon wafer to solar cell mainly includes wafer cleaning, texturization, phosphorus diffusion, silicon nitride deposition, screen printing, and sintering (Neuhaus and Münzer, 2007). The sintering process is an essential step in forming the back metallization.
The method for removing impurities consists of three steps: (1) recovery of the silver (Ag) electrode using nitric acid (HNO 3); (2) mechanical removal of the anti-reflecting coating, emitter layer, and p–n junction simultaneously; and (3) removal of the aluminum (Al) electrode using potassium hydroxide (KOH).
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