Over the last 40 years photovoltaic (PV) technology has been steadily increasing in efficiency and decreasing in cost. This has resulted in a booming PV industry where PV research and development have continued to improve the technology. Currently, the primary material used in solar PV cells is crystalline Silicon; however, there are other materials used such as Gallium Arsenide (for ultra-high efficiency) and Cadmium Telluride (thin film cells). One of the more recent developments in PV research is the use of perovskites in solar cells.