How Do You Make An Easy Homemade Solar Cell For A Science Fair?
Solar energy being the number-one alternative energy source on everybody’s list, you could do much worse than applying the concept in a science fair by building your own solar cell. While modern high-tech solar cells require laboratory and manufacturing equipment to produce, you can construct a fully functional, low-voltage solar cell from just a few scraps. Cut your square of copper flashing into two 4-inch by 3-inch rectangles. Wash them both thoroughly and use the sandpaper to burnish one of them to a gleam on both sides. Put one copper rectangle aside and lay the other one directly on one of the burners of your electric stove or hotplate. Turn the burner up to its maximum heat and move safely away from it. Heat the copper until the entire visible surface has developed a thick, crusty material across it. This is called cupric oxidization, and should take between a half-hour and an hour to become thick enough. Turn off the burner and let the copper cool until it is room temperature.