Which of the energy band diagrams shown in the figure corresponds to that of a semiconductor
A
B
C
D
[Orissa JEE 2003]
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D
In semiconductors, the forbidden energy gap between the valence band and conduction band is very small, almost equal to $k T$. Moreover, valence band is completely filled where as conduction band is empty.
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A semiconductor $X$ is made by doping a germanium crystal with arsenic $(Z=33)$. A second semiconductor $Y$ is made by doping germanium with indium $(Z=49)$. The two are joined end to end and connected to a battery as shown. Which of the following statements is correct
For a thermionic emitter (metallic) if $J$ represents the current density and $T$ is its absolute temperature then the correct curve between $\log _e \frac{J}{T^2}$ and $\frac{1}{T}$ is