Recycling solar panels is a relatively complex task because they contain many different types of materials. Panels contain metals, such as lead, copper, gallium and cadmium; an aluminum frame; silicon solar cells; and synthetic material that encapsulates the silicon. The various materials must be separated to be properly recycled. Undamaged solar cells, for example, can often be recovered and reused in new products.
Solar panel recycling has both tremendous environmental and economic benefits. A 2016 study by IRENA estimates the recyclable materials in old solar modules will be worth $15 billion in recoverable value by the year 2050. IRENA predicts solar panel recycling can help spawn new industries and will create green job opportunities.
Article from Earth911
Check out this great video demonstrating the process of recycling silicon-based PV modules.