Advertisements
Advertisements
प्रश्न
The energy required by an electron to jump the forbidden band in silicon at room temperature is about ______.
विकल्प
0.01 eV
0.05 eV
0.7 eV
1.1 eV
Advertisements
उत्तर
The energy required by an electron to jump the forbidden band in silicon at room temperature is about 1.1 eV.
Explanation:
For pure Si, the band gap or forbidden gap is 1.1 eV. An electron must therefore have this much energy to jump the forbidden band in Si at room temperature.
APPEARS IN
संबंधित प्रश्न
There are energy bands in a solid. Do we have really continuous energy variation in a band ro do we have very closely spaced but still discrete energy levels?
We have valence electrons and conduction electrons in a semiconductor. Do we also have 'valence holes' and 'conduction holes'?
In a pure semiconductor, the number of conduction election 6 × 1019 per cubic metre. How many holes are there in a sample of size 1 cm × 1 mm?
Suppose the energy liberated in the recombination of a hole-electron pair is converted into electromagnetic radiation. If the maximum wavelength emitted is 820 nm, what is the band gap?
(Use Planck constant h = 4.14 × 10-15 eV-s, Boltzmann constant k = 8·62 × 10-5 eV/K.)
The product of the hole concentration and the conduction electron concentration turns out to be independent of the amount of any impurity doped. The concentration of conduction electrons in germanium is 6 × 1019 per cubic metref conduction electrons increases to 2 × 1023 per cubic metre. Find the concentration of the holes in the doped germanium.. When some phosphorus impurity is doped into a germanium sample, the concentration o
A window air conditioner is placed on a table inside a well-insulated apartment, plugged in and turned on. What happens to the average temperature of the apartment?
The energy of a hydrogen atom in the ground state is −13.6 eV. The energy of a He+ ion in the first excited state will be:
The valance of an impurity added to germanium crystal in order to convert it into p-type semiconductor is
In a common base configuration Ie = 1 mA α = 0.95 the value of base current is
Draw the energy band diagrams for conductors, semiconductors and insulators. Which band determines the electrical conductivity of a solid? How is the electrical conductivity of a semiconductor affected with rise in its temperature? Explain.
