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Problem 4: Semiconductor junction under bias

Sketch the energy band diagram of an ideal p+-n step junction under the following conditions:

Step By Step Answers with Explanation

In semiconductor physics, understanding the energy band diagram of a p⁺-n junction under different bias conditions is crucial. A p⁺-n junction consists of a highly doped p-type semiconductor (p⁺) and a lightly doped n-type semiconductor (n). Here's a step-by-step explanation of the energy band diagram for this junction under different bias conditions:

(a) VA = 0 (No External Bias)

(b) VA > 0 (Forward Bias)

When a positive voltage (VA > 0) is applied to the p⁺ side with respect to the n-side:

When a negative voltage (VA < 0) is applied to the p⁺ side with respect to the n-side:

- P-Side: The energy levels are slightly raised due to the reverse bias, creating an increased energy barrier.