1. Solar panels; 2. Inverter; 3. Electric box; 4. Home power; 5. Battery; 6. Utility grid; 7. Glass cover; 8. Anti-refl ective coating; 9. Front contact grid (negative electrode); 10. n-type semiconductor (silicon with phosphorus); 11. p-n junction; 12. p-type semiconductor (silicon with boron);
13. Back contact (positive electrode); 14. Electrical circuit