visit my profile:http://www.instructables.com/member/argha+halder/ to see some more of such interesting projects.
Step 1: Things needed:
1)gas or electric stove
2)copper plate or flashers -2
3)a transparent plastic or glass container
the tools you will need:
1)voltmetre(just for testing)
Step 2: Making the semi conductor layer part-1
be extremely careful not to burn your hand and dont touch or dip the copper in water while its hot.
Step 3: Making the semi conductor part-2
Step 5: Making the connections well
Step 6: Setting everything up!
Step 7: Lets test it!!
Step 8: How does it work?
In a semiconductor, there is a gap, called a bandgap between the electrons that are bound tightly to the atom, and the electrons that are farther from the atom, which can move freely and conduct electricity.
Electrons cannot stay inside the bandgap. An electron cannot gain just a little bit of energy and move away from the atom's nucleus into the bandgap. An electron must gain enough energy to move farther away from the nucleus, outside of the bandgap.
Similarly, an electron outside the bandgap cannot lose a little bit of energy and fall just a little bit closer to the nucleus. It must lose enough energy to fall past the bandgap into the area where electrons are allowed.
When sunlight hits the electrons in the cuprous oxide, some of the electrons gain enough energy from the sunlight to jump past the bandgap and become free to conduct electricity.
The free electrons move into the saltwater, then into the clean copper plate, into the wire, through the meter, and back to the cuprous oxide plate.
As the electrons move through the meter, they perform the work needed to move the needle. When a shadow falls on the solar cell, fewer electrons move through the meter, and the needle dips back down.
Step 9: How to make it stronger
Step 10: Troubleshooting
i am argha halder living in naogaon bangladesh.i read in class 7.i dont know english much as it is not my mother tongue language.and so if any mistake help me find it.give some more ideas.feel free to ask questions.i will try to answer them as much as possible for me.oh! i am soon shifting to usa.so maybe this will be my last instructable in 1 or 2 months.till then bye!have a nice day