Step By Step Instructions for Building Your Own Homemade Solar Cell part 4

Step 5: Placing the copper in the mason jar
Now you will need to take the piece of copper that you heated and gently place it inside your mason jar. Be careful not to bend it too much: just gently form it to the inside curve of the jar. Make sure that the side of the copper sheet that was directly on the face of the burner is facing the inside of the jar. 
Next, repeat the same process and place the unheated piece of copper inside the jar on the opposite side of the heated piece of copper, making sure that the two pieces are not touching.
Step 6: Connecting the alligator clips
Now take the alligator clip leads from your amp meter or LCD multimeter and connect the positive lead to the unheated piece of copper and the negative lead to the heated copper sheet. 
Step 7: Pouring in the salt water
Now you’ll need to thoroughly mix a solution of around 25% salt and 75% water, ensuring that the salt is fully dissolved in the water. This solution will ensure that the two pieces of copper make a connection so that electricity can be generated. 
Slowly and gently pour the solution into your mason jar, being sure to avoid getting the alligator clips wet. The very top of the copper sheets should be above the water to again keep the leads from being wet which will cause your solar cell not to work.
Step 8: Letting the sun do its magic
Once you have filled your jar with the salt and water solution, then your DIY solar cell is ready to start generating electricity. Place the jar in the sunlight, and the copper sheet covered in the layer of cuprous oxide will react photovoltaically and generate a small amount of electricity due the sunlight. 
Connect your amp meter to the alligator clips and you should be able to read how much electricity is being produced. 
Don’t expect this device to produce very much energy, but if you connect multiple of these DIY solar cells together, you may generate enough power to run or charge a small device.