Question

• Assertion (A): Putting the p-type semiconductor slab directly in physical contact with the n-type semiconductor slab cannot form the pn junction.
• Reason (R): The roughness at contact will be much more than inter atomic crystal spacing and continuous flow of charge carriers is not possible.

विकल्प

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

• If Assertion is true but Reason is false.

• If both Assertion and Reason are false.

Answer 1

If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Explanation:

A pn junction cannot be formed by physically contacting a p-type semiconductor slab with an n-type semiconductor slab. The roughness upon contact does not match the inter-atomic crystal spacing of about 2-3 Å, resulting in a discontinuity. As a result, a continuous flow of charge carriers is impossible. So both the statement and the reason are correct, and the reason explains the assertion.