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Why are Si and GaAs are preferred materials for solar cells?

Why are Si and GaAs are preferred materials for solar cells?

Grade:11

2 Answers

Anjali Ahuja
askIITians Faculty 234 Points
9 years ago
The reasons may be
a) these materials are preffered because of their lower value of energy gap. SO that they can be activated using solar radiation.
b) their V-I characteristics are similar to a semiconductor.

Solar cell means when exposed to light, can generate and support an electric current without being attached to any external voltage source.
And GaAS and Si are the semiconductors and preffered so.

Chinu
13 Points
5 years ago
This is because the max intensity of electrons from sunlight have energy gap of around 1.5 ev. So si and GaAs have eg 1.1 and 1.43 respectively and are hence better for Use in solar cells. Moreover they are cheaper and readily available and have higher absorptive power.

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