Debonding of ethylene–vinyl acetate (EVA) copolymer is critical for recycling the end-of-life (EoL) crystalline silicon (c-Si) photovoltaic (PV) modules. The currently utilized methods are mainly
3.2. Removal of the EVA resin by heat treatment As Fig. 3 shown, after the separation process, EVA resin still remained on the PV cell. Heat treatment process was employed to remove EVA
Ethylene-vinyl acetate, often referred to as EVA, is a polymer-based material widely used in the solar industry as an encapsulant to secure photovoltaic cells in place within a solar panel. This substance acts as a buffer, protecting the cells
The PV module structure from bottom to top is glass, encapsulation film, battery sheet, encapsulation film, and back sheet/glass, the photovoltaic adhesive film will be the battery sheet with the top cover below
Solar panel lamination. Sealed into ethylene vinyl acetate, they are put into a frame that is sealed with silicon glue and covered with a mylar back on the backside and a glass plate on the front
Doi et al. [31] applied various organic solvents to crystalline-silicon solar panels to remove the EVA layer, which was found to be melted by diverse types of organic solvents, of
Ethylene-vinyl acetate, often referred to as EVA, is a polymer-based material widely used in the solar industry as an encapsulant to secure photovoltaic cells in place within a solar panel. This
These features enable advanced water spray, 15 water veils, 16 and backside direct-contact water 17 to achieve high heat-removal efficiency. However, as the water jet,
While applying EVA to a solar cell, the curing process creates crosslinking between the vinyl acetate chains . There are two ways to get rid of EVA: heat treatment and dissolution in an organic solvent. Glass and solar cells are recovered with ease using thermal treatment.
Scientists in China developed a novel swelling process to detach glass and EVA backsheets from solar modules at the end of their lifecycle. The technique utilizes an ester of a dicarboxylic acid known as dibasic ester. It reportedly prevents excessive cracking of solar cells.
By utilizing a 1064 nm near-infrared optical-fiber pulsed laser, a laser irradiation followed by mechanical peeling method was demonstrated to recycle the back EVA layer on the solar cells in c-Si PV module.
The recycled EVA and solar cell both have great potential for reuse. Furthermore, for PV module with defective back-sheet, the method also offers an available way to remove the EVA adhesive for replacing the back-sheet.
A research group from the Chinese Academy of Sciences has developed a new swelling process to separate glass and backsheets based on ethylene-vinyl acetate (EVA) from solar cells in end-of-life modules. “Our swelling process is not violent and controllable,” said Wang Dong, the research's lead author.
Ethylene-vinyl acetate (EVA) encapsulate the solar cell, and this layer must be removed to get to the other materials that can be recycled. EVA can be removed with the help of heat treatment and organic solvents. In this work, the interaction of EVA with different organic solvents was studied.
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