Solar energy is a renewable, sustainable, and eco-friendly solution to meet our ever-increasing energy demands. Homemade solar cells can be an interesting project to understand the fabrication process and harness solar power for various applications. Here are 15 steps on how to make solar cells.

1. Gather Materials: You will need the following items – copper sheets, glass sheets, alligator clips, protective gloves, safety goggles, pliers, a burner or hot plate, water, clear plastic tape, salt, a voltmeter and micro-ammeter.

2. Cut Copper Sheets: Carefully cut two equal-sized copper sheets using pliers. These should be large enough to cover the area you wish to harness solar power.

3. Clean Copper Sheets: Remove any grease or dirt from both copper sheets using soap and water. Dry them completely.

4. Heat Copper Sheet: Put on your protective gloves and safety goggles. Place one of the copper sheets over a burner or hot plate and heat it until it turns reddish-black. This forms copper oxide on its surface.

5. Cool Down Copper: Remove the heated copper sheet from the burner using pliers and let it cool down naturally for about 20 minutes. The black layer of copper oxide will likely flake off during this process.

6. Gently Remove Oxide Layer: Use a gentle brush or sponge to remove any remaining copper oxide flakes under running water.

7. Prepare Electrolyte Solution: Mix warm water with a small amount of salt in a container to create an electrolyte solution.

8. Assemble Solar Cell: Place both copper sheets parallel to each other in the container with the electrolyte solution. Ensure that the treated side of the first sheet faces the untreated side of the second sheet without touching each other.

9. Connect Copper Sheets: Attach alligator clips to both pieces of copper and connect them to a micro-ammeter and voltmeter.

10. Place Under Sunlight: Position the solar cell assembly under direct sunlight and observe the micro-ammeter’s reading. This shows the electrical current generated by your homemade solar cell.

11. Test with Different Angles: You can experiment by adjusting the angle of your solar cell to receive maximum sunlight and, in turn, generate more electricity.

12. Connect Multiple Cells: For higher power output, you can create multiple homemade solar cells and connect them in series or parallel using alligator clips.

13. Encase Solar Cell: Use clear plastic tape or a glass sheet to cover and protect the solar cells from environmental factors while still allowing sunlight to pass through.

14. Integrate Solar Cells with Battery: Connect your solar cells to a rechargeable battery for energy storage. This battery can be used to power electronic devices during periods of low sunlight or nighttime.

15. Experiment & Improve: Continually refine materials and methods to improve efficiency, durability, and power generation from your homemade solar cell project.

By following these steps, you can successfully create a homemade solar cell that harnesses the sun’s power for various applications. Remember always to take necessary safety precautions while heating copper sheets or handling chemicals during this process.