Dye Sensitized (Raspberry Juice)Solar Cells is a hands-on activity adapted for classroom by UW MRSEC. This solar cell was invented by Michael Grätzel and Brian O'Regan at the École Polytechnique Fédérale de Lausanne in 1991. They are also known as Grätzel cells. In this activity students build a dye-sensitized solar cell using nanocrystalline titanium dioxide and raspberry juice. They then test the response of these solar cells to light (overhead projector or sun light). They also explore the effects of different 'dyes' on the performance of the solar cell.