Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion


The most commonly used semiconductor material is

[A]. silicon
[B]. germanium
[C]. mixture of silicon and germanium
[D]. none of the above

Answer: Option A


Germanium is rarely used.

Nandini said: (Mar 26, 2014)  
Silicon is used mostly because of its presence in abundance.

Abitha said: (Apr 6, 2014)  
Silicon is mostly used. Germanium is very costly.

Rahul said: (Apr 9, 2014)  
Silicon is easily available and cheap compare to germanium.

Rajat said: (Jul 3, 2014)  
Silicon have band gap 0.7 with compare to germanium 0.3 so that its more stable than germanium.

Rikimani said: (Jul 27, 2014)  
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.

Seemanth said: (Nov 23, 2014)  
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).

Nithya said: (Nov 28, 2014)  
Silicon has less leakage current. So si is preferred.

Korada Prudhvi Raj said: (May 19, 2015)  
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.

Rajivgandhi.M said: (Dec 9, 2015)  
Silicon is stable than Germanium.

Ajay P Roy said: (May 31, 2016)  
I agree with Korada Prudhvi Raj.

Ramakrishna said: (Jun 25, 2016)  
Why not it should be a Germanium?

PRABIR said: (Jun 28, 2016)  
The si can easily convert to silicon dioxide by oxidation. So that in making electronic devices it uses as insulator between terminal.

Shiva said: (Aug 3, 2016)  
Silicon has band gap 0.7 with compared to germanium 0.3 so that it's more stable than germanium.

M.Muthumari said: (Aug 21, 2017)  
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.

Gangadhar said: (Jul 22, 2018)  
Silicon in the pure form is a semiconductor and it is less expensive then other Semiconductors that's why silicon is mostly used.

Somya said: (Aug 19, 2018)  
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.

Siva said: (Dec 29, 2019)  
The main reason is silicon draws low current compares to Germanium.

Ashwini said: (May 28, 2021)  
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.

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