Classification of semi-conductors
Question
When added an impurity into the silicon, which one of the following produces n-type of semiconductors?
Moderate
Solution
Silicon has 4 valence electrons. When phosphorous with 5 valence electrons in its outermost orbit is added, then four of the five valence electrons of the impurity atom form covalent bonds with each valence electron of four silicon atoms and fifth valence electrons becomes free to move in the crystal. As the electrons are negative charge carriers, they are called n-type.
Note: Aluminium has three valence electrons which gives rise to p-type crystal.
Get Instant Solutions
When in doubt download our app. Now available Google Play Store- Doubts App
Download Now
Recieve an sms with download link
OR
SCAN ME
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
