In various embodiments described herein, a device comprising a light guiding layer optically coupled to a photocell is described. A plurality of surface features are formed on one the surface of the light guiding layer. The surface features can comprise facets that are angled with respect to each other....http://www.google.com.au/patents/US20090126792?utm_source=gb-gplus-sharePatent US20090126792 - THIN FILM SOLAR CONCENTRATOR/COLLECTOR
