The first person in the form of a pn junction solar cells, researchers Gerald Pearson named Bell Laboratories in 1954 while researching the history. On the interaction between light and matter in terms of power, starting from the year 1893 E-Bequerel French scientists. Be the first person to discover that. When light hits an object to generate electricity up. The experiments were conducted by removing metal bipolar immersion ion. Then the light incident on a pole during Ede. It appears that the current in the wires that connect the two poles. Demonstrate the power of the object. When light is incident He also found that when the color change. (Wavelength energy) of the light amount of electricity occur. Will change by the year 1873 Smith has discovered that when light input resistance of selenium, it will change to show that. Electric light was solid in later years, 1883 Adams and Day found that selenium will be shining on the voltage up. This is the first discovery of the potential power of the light efficiency of energy conversion. (Light into electricity) of selenium is low, only about 1%, however, can be utilized. To measure the intensity of light in the copier, etc. The pn junction solar cells created in a manner that Pearson was even used the first few times. Efficiency of energy conversion is high 6% current solar cells have been developed and more and more powerful, it is much higher.