how-to: homemade solar panel

All you need is a tin oxide electrode, a graphite electrode, some nanocrystalline titanium dioxide, and... raspberries??? These are actually really easy to make and are the latest fad in biological solar power relying on the photosynthetic/chemical properties of berry juice and titanium oxide.

This tutorial shows you exactly how to do it , so does this one based on a kit, and so does this one, and this one explains how the whole thing works.

Here's a couple variations that are more electrochemical in nature (1) (2) using cupric oxide and saltwater.