We check that our suppliers have considered recyclability when we purchase solar modules for our customers' projects. We use only modules with silicon solar cells; these are far more environmentally friends than thin film cells since they have no heavy metals.
Tier 1 solar modules typically produce energy for 30+ years. At their end-of-life, they can be recycled by speciality recycling companies such as PV Cycle and others. Modules made from silicon solar cells are made mostly of silicon, glass, and aluminum; these components are separated for re-use during the recycling process.