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Usually Si is used in the designing of photodiodes because

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Important Questions on Semiconductors

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Photodiode is a device  
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For a photodiode, the forbidden energy gap Eg of the material used is 2.8 eV and wavelength of radiation (λ) incident on it is 5780 A. Then, the emission of electrons is possible when incident radiation has,
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The maximum wavelength which a photodiode can detect with Eg=0.74eV is,
 
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The value of  β for a transistor, for which α=0.95, will be-
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In a common base configuration IE=1mA, IC=0.95 mA. The value of base current is -
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Improper biasing of a transistor circuit produces
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For a transistor, if  IcIe=0.96,  then the current gain for common emitter is -