Here is a low power low efficiency photovoltaic cell that you can make you own in the kitchen
with materials from the hardware store.
This cell is made from cuprous oxide instead of silicon and you can build a working solar cell in 2 hours
to build it i follow this instruction: http://scitoys.com/scitoys/scitoys/echem/echem2.html

Step 1: Materials you will need

A sheet of copper flashing from the hardware store
A transparent CD case
Electric wire
Sodium bicarbonate or Table salt

An electric stove
hot glue
Sheet metal shears for cutting the copper sheet

I suggest you visit http://scitoys.com there are many projects and interesting kit

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