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Q.

Which of these materials cannot be used to make solar cells?


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a

Magnesium

b

High purity silicon

c

Gallium Arsenide

d

Selenium 

answer is A.

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Detailed Solution

Magnesium cannot be used to make solar cells.
A solar cell is a device which converts solar energy directly into electricity. Magnesium cannot be used to make solar cells because it does not give efficiency. High-purity silicon gives an efficiency of  10 % to 12 %. Gallium Arsenide gives an efficiency of 20 % to 25 %. Also, Selenium gives an efficiency of about 25 %.
 
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