What material is most commonly used to make a photovoltaic solar cell?

Solar cells can be classified into first, second and third generation cells. The first generation cells—also called conventional, traditional or wafer-based cells—are made of crystalline silicon, the commercially predominant PV technology, that includes materials such as polysilicon and monocrystalline silicon.

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers