Obtaining cullet from thin film solar modules

A method of obtaining cullet from a thin film solar module unit is disclosed. The method involves applying a detectable tagging material onto an exposed outer surface of a glass substrate of the thin film solar module unit over one or more electrically conductive contact strips located beneath and visible through the glass substrate. Thereafter, the thin film solar module unit is crushed into assorted module pieces. The assorted module pieces are then sorted by detecting module pieces that include the detectable tagging material and separating the assorted module pieces into a collection of accepted module pieces and a collection of rejected module pieces. The collection of accepted module pieces has module pieces determined not to include the detectable tagging material. Recycled glass is then obtained from the collection of accepted module pieces.