renewable energy technology

What is best material that can be used to have highest efficiency in the solar technology (renewable energy)?
Some material that i found;
1. Silicon
2. Gallium Arsenide
3. Selenium Cadmium Sulpide
4. Thinfilm Cadmium Sulpide
if posible, please include the composition of the material used
Do we really need solar in future
Do we really need solar in future?
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