The solar cell technology originates from the year 1839. A French physicist Antoine-César Becquerel while experimenting with a solid electrode in an electrolyte solution, discovered the photovoltaic effect. During his experiments, he studied that when light falls upon an electrode, it can generate an electrical voltage. Some years later it was Charles Fritts who developed the solar cells in their true sense by coating semiconductor selenium with a very thin and almost transparent layer of gold some 50 years later. Fritts’s devices were not very efficient, as they could only transform less than 1 percent of absorbed sunlight into electricity. According to today’s parameters, these early solar cells capacity can be considered inefficient, but they broadened a vision of a free, abundant, and clean source of energy among many others. In 1927 a different metal-semiconductor junction solar cell, made of copper and copper oxide semiconductor was demonstrated.