Recycling Technologies for Photovoltaic Modules

Photovoltaic module recycling has emerged as a critical component of sustainable energy systems, driven by the rapid expansion of solar installations worldwide and the finite availability of key materials. Modern modules are complex laminates combining glass, silicon cells, metal conductors and polymer encapsulants, posing challenges for efficient disassembly and material recovery. A suite of mechanical, thermal and chemical processes has been developed to delaminate modules, separate constituent layers and reclaim valuable resources such as high-purity silicon, aluminium, copper and silver. Thermochemical treatments, notably pyrolysis, facilitate polymer removal without oxidising sensitive layers, while advanced mechanical comminution and sieving techniques concentrate metallic fractions. Electrostatic and magnetic separation further refine metal recovery, reducing reliance on virgin feedstocks and supporting circular-economy objectives. Emerging approaches integrate life-cycle assessment and socio-economic modelling to optimise recycling chains, minimise environmental emissions and align end-of-life management with global decarbonisation goals.

Research from Nature Portfolio

Recent studies have examined the energy potential and social dynamics of module recycling. One investigation assessed the pyrolytic treatment of polymer encapsulants, demonstrating that ethylene vinyl acetate retains calorific values comparable to biodiesel, thereby providing a viable energy recovery pathway during delamination. This work highlighted the retention of thermal properties after field deployment, indicating robust energy yields from used modules. Another study integrated techno-economic and agent-based modelling to explore social influences on recycling and reuse uptake. It revealed that consumer attitudes significantly drive circularity outcomes, showing that enhanced awareness campaigns can increase module reuse by up to one-third of projected demand. The analysis underscores the need to complement technical innovations with targeted social interventions to achieve scalable material recovery.

Recycling Technologies for Photovoltaic Modules publication trend

The graph below shows the total number of articles in recycling technologies for photovoltaic modules across all publications each year (not limited to Nature Index journals).

Technical terms

Pyrolysis: Thermochemical decomposition of organic components at elevated temperatures in an inert atmosphere to facilitate delamination and energy recovery.

Delamination: The process of separating layered materials, such as encapsulant and glass, within photovoltaic modules without damaging functional cells.

Circular economy: An economic model aimed at minimising waste and maximising resource reuse by closing material loops through recycling and refurbishment.

Electrostatic separation: A method that exploits differences in electrical conductivity and surface charge to sort particles and concentrate metal fractions.

End-of-life (EoL): The stage at which a product is retired from service and directed towards disposal, recycling or recovery processes.

References

1. Cradle-to-cradle recycling in terawatt photovoltaics: A vision of perpetual utility. Joule (2024).
2. Study of electrostatic separation to concentrate silver, aluminum, and silicon from solar panel scraps. CIRCULAR ECONOMY (2023).
3. Technical challenges and opportunities in realising a circular economy for waste photovoltaic modules. Renewable and Sustainable Energy Reviews (2020).
4. Assessment of the energy recovery potential of waste Photovoltaic (PV) modules. Scientific Reports (2019).
5. Role of the social factors in success of solar photovoltaic reuse and recycle programmes. Nature Energy (2021).