In a recent media statement, lead author David Young highlighted the challenges posed by polymers in the recycling process according to most recyclers. To address this issue, scientists utilized a femtosecond laser in their experiment to weld glass on solar modules.
The femtosecond laser employs a short pulse of infrared light to melt glass together and create a strong, hermetic seal. This welding technique can be utilized on various types of solar technology, including silicon, perovskites, and cadmium telluride, as the heat is confined to a small area near the laser focus.
Solar modules are typically made of semiconductors sandwiched between glass sheets laminated with polymer. Research from the National Renewable Energy Laboratory (NREL) demonstrated that glass/glass welds are just as strong as the glass itself, eliminating the need for polymers. This innovative approach could offer a cost-effective and sustainable solution for the solar industry.
Young emphasized the importance of proper mounting and modifications to the glass features to ensure the welded module is stiff enough to pass static load testing. The femtosecond laser welding shows superior strength and hermetic sealing compared to previous methods involving nanosecond lasers. While this study represents a high-risk, high-reward endeavor, it paves the way for future research to extend the lifespan of solar modules beyond 50 years and simplify the recycling process.
In conclusion, this new approach utilizing femtosecond lasers has shown promising results in addressing challenges posed by polymers in recycling processes for solar modules. This innovation could lead to cost savings and sustainability benefits for the solar industry while also improving product performance and longevity.
