In this experiment, students construct fully functional solar cells from titania nanocrystals and raspberry juice.  They then test the response of these solar cells to either sunlight or the light of an overhead projector.  The solar cells that the students construct are examples of a new class of nanoscale device call a dye sensitized solar cell.  In addition to learning about materials fabrication and the mechanism for converting sunlight into electricity, students will also have the opportunity to explore many broader concepts such as the importance of solar energy to the environment, the effect of nano-science on solar cell performance, and the similarities between biological  photosynthesis and device based solar energy conversion.