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The band gap between the valence and the...

The band gap between the valence and the conduction bands in zinc oxide `(ZnO)`is 3.0eV.Suppose an electron in the conduction band combines with a hole in the valence band and the excess energy is released in the form of electromagnetic radiation .Find the maximum wavelength that can be emitted in this process.

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Give Band gap `= 3.2eV`
`E = (hc)/(lambda) = (1242/(lambda )= 3.2`
`lambda = 388.1nm`
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HC VERMA-SEMICONDUCTOR AND SEMICONDUCTOR DEVICES-exercises
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  2. When a semiconducting meterial is doped with an impurity,new acceptor ...

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  4. Suppose the energy liberated in the in the recombination of a hole-ele...

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  7. Let (Delta)Edenote the energy gap between the valence band and the con...

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  8. The conductivity of a pure semiconductor is roughly proportional to T^...

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  10. The product of the hole concentration and the conduction electron conc...

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  14. The potential barrier exists across the junction is 0.2volt.What minim...

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  15. In a p-n junction,a potential barrier of 250 mev exsists across the ju...

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  16. When a p-n junction is reverse-biased,the current becomes almost const...

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  18. The current-voltage characteristic of an ideal p-n junction diode is g...

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  19. Consider a p-n junction diode having the characteristic i=i0(e^(eV//kT...

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