Recently, the National Renewable Energy Laboratory (NREL), part of the U.S. Department of Energy, made a revolutionary breakthrough when they developed a proof-of-concept methodology designed to completely remove polymers from the manufacture of solar panels, resulting in more efficient and environmentally friendly recycling.
To address this challenge, NREL's research team has taken a different approach and come up with an innovative solution to implement glass-to-glass welding directly in solar cells.
The core of this solution lies in the utilization of infrared femtosecond laser technology. By precisely controlling the laser pulse, the energy is focused on a specific area of the solar panel in a very short period of time, creating a robust glass-to-glass weld. It is worth mentioning that femtosecond laser technology has already been widely used in the field of medical eye surgery, such as cataract surgery, and its safety and reliability have been fully verified.
The research has been published in the IEEE Journal of Photovoltaics. The research team points out that the laser welding technology has a wide range of applicability, not only for silicon materials, but also with a variety of materials such as calcite and cadmium telluride. Due to the highly focused nature of the laser, the heat generated is limited to a very small range and does not cause damage to the battery material. At the same time, the strength of the welds inside the glass is comparable to that of the glass itself, ensuring the long-term stability and durability of the module.
This research is supported by the Durable Module Materials Alliance, which is dedicated to extending the life of solar panels to 50 years and beyond. With NREL's innovative laser technology, we can expect to realize more efficient and environmentally friendly solar panel recycling in the future, contributing to the sustainable development of renewable energy.
