Solar cells are typically made from which material?

Solar cells are typically made from which material?

• A. Silicon
• B. Copper
• C. Aluminum
• D. Glass

Answer: (A)

The material choice for most solar cells hinges on having a reliable semiconductor that can form a p-n junction to convert light into electricity. Silicon fits this role exceptionally well: it is abundant, can be purified to very high quality, and forms a stable crystal structure that supports efficient charge separation when doped. Its bandgap around 1.12 eV aligns well with the solar spectrum, making it effective at absorbing sunlight and generating current. Over decades, silicon-based manufacturing has matured into a scalable, cost-efficient process—growing ingots, slicing wafers, doping, and applying contacts—creating a huge, well-supported supply chain and infrastructure. The other materials listed aren’t used as the active light-absorbing layer: copper and aluminum are metals and do not create the essential p-n junctions, while glass is an insulating substrate or cover rather than the photovoltaic material. Although other PV technologies use different compounds, silicon remains the typical material for solar cells today.

The material choice for most solar cells hinges on having a reliable semiconductor that can form a p-n junction to convert light into electricity. Silicon fits this role exceptionally well: it is abundant, can be purified to very high quality, and forms a stable crystal structure that supports efficient charge separation when doped. Its bandgap around 1.12 eV aligns well with the solar spectrum, making it effective at absorbing sunlight and generating current. Over decades, silicon-based manufacturing has matured into a scalable, cost-efficient process—growing ingots, slicing wafers, doping, and applying contacts—creating a huge, well-supported supply chain and infrastructure. The other materials listed aren’t used as the active light-absorbing layer: copper and aluminum are metals and do not create the essential p-n junctions, while glass is an insulating substrate or cover rather than the photovoltaic material. Although other PV technologies use different compounds, silicon remains the typical material for solar cells today.