Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

Discussion Forum : Electronic Devices and Circuits - Section 1 (Q.No. 3)
The most commonly used semiconductor material is
mixture of silicon and germanium
none of the above
Answer: Option

Germanium is rarely used.

18 comments Page 1 of 2.

M.Muthumari said:   6 years ago
Silicon is preferred over germanium because,
Silicon has
1.Fewer free electrons than germanium
2.Less collector cut off current
3.Operate upto 150 degree Celsius.So Silicon can not damagrd easily.(germanium operate at 70 degree celsius it can be destroyed at 100 degree celsius.

Disadvantage of silicon is higher bias voltage is required to cause current flow in a circuit.

Ashwini said:   2 years ago
Si is mostly used because.

1) si available in large quantity in the form of sand or silica.
2) si device can be operated over a void range of temperature.
3) si device has a smaller leakage current.
4) si easier to form SiO2 which makes fabrication simpler.

Rikimani said:   9 years ago
Silicon has energy gap of 0.7 eV and that of germanium has 0.3 eV. So it possible for germanium to jump electrons from valence band to the conduction band at nearly about room temperature. Hence get uncertain in its conduction. Thus silicon use most.

Korada prudhvi raj said:   8 years ago
1. Peak inverse voltage of germanium is less than silicon hence si gives better operable range.

2. E.g of ge is less than si hence si gives better operable range.

3. Secondary reason : Abundant raw material is available for si.

Seemanth said:   9 years ago
In silicon its valence electrons are closely bound to the nucleus. But in germanium valence electrons are too far away from nucleus and they are loosely bound. So si (14) and ge (32).

Somya said:   5 years ago
Si is preferred over Ge due to the more thermal stability of si as compared to Ge because of the more forbidden energy gap in Si as compared to Ge.

PRABIR said:   7 years ago
The si can easily convert to silicon dioxide by oxidation. So that in making electronic devices it uses as insulator between terminal.

Gangadhar said:   5 years ago
Silicon in the pure form is a semiconductor and it is less expensive then other Semiconductors that's why silicon is mostly used.

Shiva said:   7 years ago
Silicon has band gap 0.7 with compared to germanium 0.3 so that it's more stable than germanium.

Rajat said:   9 years ago
Silicon have band gap 0.7 with compare to germanium 0.3 so that its more stable than germanium.

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