Addressing the concerns of environmentalists who worry about solar panels ending up in landfill. German researchers have found the answer.
We cover our rooftops with solar panels and encourage everyone else to do so. Australia has the highest per capita take-up of rooftop solar. However, these things have a lifespan, and there comes a time when they need to be replaced by more efficient modules. What happens to old, discarded solar panels? Many are reused, but some are discarded and end up in landfills. This is not an environmentally friendly action, polluting land and water.
A solar panel consists of aluminum, glass, copper, and silicon. Aluminum, glass, and copper are easily recycled, but what of the silicon — ten thousand tonnes a year in Germany alone, and this figure will rise.: “The process for recovering the silicon material from discarded solar PV modules was developed by a working group at Fraunhofer CSP, together with Reiling GmbH & Co. KG, and backed by funding from the German Federal Ministry for Economic Affairs and Climate BMWK.
“Crystallisation is carried out with 100% recycled silicon without the addition of commercial ultrapure silicon, and the wafers are then fabricated into PERC solar cells at Fraunhofer ISE’s PV-TEC. The resulting PERC solar cells delivered a conversion efficiency of 19.7%.”are: “Passivated emitter rear contact solar cells consist of the addition of an extra layer to the rear-side of a solar cell.
It is expected that this technology will spread and allow greater reuse of the constituent materials of a solar panel, and also reduce the arguments that make some oppose renewable energy . A lot less solar panels are going to end up in landfill.
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