Amorphous silicon photovoltaic glass features a thin, uniform layer of silicon between two glass panels, allowing light to pass through due to its inherent transparency. Used as semiconductor material for a-Si solar cells, or thin-film silicon solar cells, it is deposited in thin films onto a variety of flexible substrates, such as glass, metal. . Amorton thin film cells are available on rigid and flexible substrates for indoor and outdoor use, as standard cells or customized solutions. It offers a more aesthetic appearance than crystalline silicon (c-Si) and performs well in diffuse light conditions and vertical. . Micromorphous silicon module technology combines two different types of silicon, amorphous and microcrystalline silicon, in a top and a bottom photovoltaic cell. Unlike traditional monocrystalline and polycrystalline silicon, which have an ordered crystal structure, amorphous silicon has a disordered structure at the atomic level. This unique property gives it. . Amorphous silicon (a-Si) thin film solar cell has gained con-siderable attention in photovoltaic research because of its ability to produce electricity at low cost. Also in the fabrication of a-Si SC less amount of Si is required. In this review article we have studied about types of a-Si SC namely. .