ID: 
2331
Maker's Name: 
National Fabricated Products Inc
Where made: 
USA
Dimensions: 
2.5 × 2.5 × 1.8 cm

The cell is made of semiconductor materials, and comprises a large Silicon PN diode. Light has sufficient energy to induce a voltage difference across the cell by separation of charge. When the wires from the PN junction are connected to an external circuit, current flows.