In various embodiments described herein, a device comprising a light collector optically coupled to a photocell is described. The device further comprises a light turning film or layer comprising volume or surface diffractive features or holograms. Light incident on the light collector is turned by volume or surface diffractive features or holograms that are reflective or transmissive and guided through the light collector by multiple total internal reflections. The guided light is directed towards a photocell. In various embodiments, the light collector is thin (e.g., less than 1 millimeter) and comprises, for example, a thin film. The light collector may be formed of a flexible material.