A video article expanding on Advancements in multi-junction semiconductors, talking about it’s history, from transistors to microchips, talks about the various material used in semiconductors such as Silicon (Si), Gallium (Ga), Galena (Gn), Selenium (Se), Indium (In), Copper (Cu), Cadmium (Cd), Germanium (GE), talking about the uses in solar cells etc.