A new method is reshaping solar panel recycling. Instead of burning or using harsh acids, researchers use simple polyethylene wedges to separate at room temperature panels laminated with polydimethylsiloxane (PDMS) gel, an ultra‑soft silicone. The process is mechanical, clean, and low‑energy. Results are striking: 95‑98 % of materials are recovered, with up to 81 % of panel weight directly reused. Moreover, PDMS panels show very low annual degradation rates (0.15‑0.22 %), far better than traditional EVA/POE laminates. Thanks to these traits, the life‑cycle carbon footprint drops dramatically, supporting circular economy goals and the SDGs. Mechanical delamination eliminates hazardous waste and cuts energy consumption, making solar energy production even greener. In practice, this solution blends long operational life with an efficient end‑of‑life, paving the way for more sustainable policies in the global energy transition.
How are solar panels recycled with soft silicone gel?
Polydimethylsiloxane (PDMS) gel is an organosilicon polymer characterized by low surface energy, high flexibility, and thermal stability up to 200 °C. These properties make it ideal for photovoltaic cell lamination, providing sufficient adhesion during operation while allowing easy separation when a controlled mechanical force is applied. The delamination method uses polyethylene wedges shaped like a V, inserted between the glass and the PDMS. The applied pressure creates a shear stress that exceeds the gel's adhesion energy without breaking the silicon cells. The intervention occurs at room temperature, avoiding energy consumption for heating or cooling.
From an energy perspective, the mechanical process consumes about 0.2 kWh per square meter of panel, versus 5‑10 kWh required by thermal or chemical techniques. This translates into a CO₂ emission reduction of roughly 0.5 kg per m², based on the average energy mix. Moreover, the near‑total preservation of panel weight (81 %) enables direct reuse of structural components, reducing demand for raw materials such as tempered glass and aluminum.
Life‑cycle assessment (LCA) of PDMS panels shows a 30‑40 % decrease in overall footprint compared to EVA/POE panels, thanks to three key factors: (i) lower degradation during use, (ii) high recycling efficiency, (iii) absence of hazardous chemicals in end‑of‑life processing. Cost analysis indicates that, despite a slight price increase of PDMS over EVA, the energy savings and reduced disposal costs more than offset the initial investment. In summary, the combination of PDMS chemical properties and mechanical delamination offers a scalable, low‑environmental‑impact, and economically advantageous solution for the photovoltaic industry.
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