Why can't we physically join p-type and n-type semiconductors directly to form a p-n junction? Why the depletion layer widens on doing so?
Asked by Aswin | 14th Jan, 2016, 05:21: PM
A pn junction works if there is a continuous structure when joined.
If we physically join the two semiconductors, then there will always be very small microscopic gap or dicontinuity between the two because of roughness.
A p-type semiconductor has holes as majority carriers and the n-type semiconductor has electrons as majority. When a pn junction is formed, the holes from p and electrons from n move to the other type and hence, the width of the depletion layer widens.
Answered by Romal Bhansali | 15th Jan, 2016, 12:07: PM
- define semiconductors and types of semiconductors
- Formation of depletion layer
- What do you mean by depletion layer and potential barrier for a p-n junction.
- Can we measure the potential difference of a p-n junction by putting a sensitive voltmeter across its terminals?
- Name the different types of currents flowing through a p-n junction diode.
- a) In the depletion region of an unbiased p-n junction diode, what are the charge carriers? b)Which biasing makes the junction resistance low and which high?
- What do you understand by breakdown and breakdown voltage?
- How does an ideal diode behave when forward biased and reverse biased?
- What all techniques need to be used to obtained p-n junction?
- If the forward voltage in a semiconductor diode is changed from 1 to 2.5 V, then the forward current changes by 1.5 mA. What is the resistance of junction diode?
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Verify mobile number
Enter the OTP sent to your number