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Which semiconductor materials are used to make solar cells?
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solar cell
A commonly used solar cell structure. In many such cells, the absorber layer and the back junction layer are both made of the same material.
Solar cells rely on semiconductor materials to convert light into electricity through the photovoltaic effect. These materials are chosen for their ability to absorb photons and facilitate the movement of electrons.12
Common semiconductor materials used in solar cells include:
- Silicon: The most widely used material, available in crystalline, polycrystalline, and amorphous forms.13
- Cadmium telluride: A common thin-film material known for its low cost and small carbon footprint.3
- Gallium arsenide (GaAs): A high-efficiency semiconductor often used in specialized applications like spacecraft and satellites due to its high manufacturing cost.324
- Copper indium gallium selenide (CIGS): A promising thin-film semiconductor used in flexible solar technologies.3
- Indium phosphide: Another semiconductor material employed in solar cell construction.2
The performance of these materials is largely determined by their band gap, which dictates the range of light frequencies they can convert into an electric current. These materials are often used in combination with junction-forming layers to create the necessary electric field for power generation.12