the invention describes a polymer that is composed of a fluoropolymer modified with a uv absorber . the uv absorber is grafted to the polymeric backbone of the fluoropolymer . optionally , a hals can also be grated to the polymeric backbone of the fluoropolymer . incorporation or the absorber or stabilizer helps to reduce degradation of underlying layers such as an encapsulant while still allowing useful light energy to pass through the layers to a device , such as a photovoltaic device .