6) The band gap of the semiconductor gallium arsenide (GaAs) is 1.43 eV , and th

Question

6) The band gap of the semiconductor gallium arsenide (GaAs) is 1.43 eV , and the bandgap for the semiconductor aluminum gallium arsenide (A1GaAs) is 2.06 eV. a) What is the maximum wavelength absorbed by GaAs? b) What is the maximum wavelength absorbed by A1GaAs? c) A CD player and a DVD player use a semiconductor diode laser to read data off a CD or DVD disc respectively. The capacity of a CD is 650 MB and the capacity of a DVD disc is 8 GB. Which semiconductor (GaAs or A1GaAs) is used in the DVD player? Explain your answer based on the capacity of the CD and DVD, and that the area of the CD and DVD are the same (assuming both are single layer). d) A blue ray disc has a capacity of 25 GB. What is ''blue'' about the blue-ray player?

Explanation / Answer

The maximum wavelength of the GaAs is ,

lamda= 1240 ev nm/1.43 ev =867 nm

The maximum wavelength of AlGaAs is

lamda= 1240 ev nm/2.06 ev =602 nm

AlGaAs will be used for semi-conductor layer.

Blue refers to blue laser that is used to read the disc

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