The carrier concentration of a PN junction is given in the figure and the minority carriers are labelled. What is the type of the given PN junction?

Question

BlackTom AI · Accepted Answer

To determine the type of the PN junction from the diagram, we need to identify which side is p-type (holes majority) and which side is n-type (electrons majority).

- The diagram labels show 'holes' on the left side and 'electrons' on the right side. In semiconductor terminology, a region where holes are the majority carriers is p-type, and a region where electrons are the majority carriers is n-type.
- Therefore, the left-hand side must be p-type (rich in holes) and the right-hand side must be n-type (rich in electrons).

Now evaluating the given option:
- The option 'N+/P junction' would imply a heavily doped n-type region on the left (N+) and a p-type region on the right. This is inconsistent with the diagram, which shows p-type on the left and n-type on the right, not an N+ region on the left.
- Since the visual labeling clearly indicates a p-type region on the left and an n-type region on the right, the junction is a standard P-N junction with the P-side on the left and the N-side on the right.

In short, the diagram corresponds to a P-N junction (P on the left, N on the right), not an N+/P junction. The proposed answer misidentifies the doping orientation and thus is incorrect.

EESM5200 (L1) Part I: Topic 5 - Derivation of Ideal PN Junction Diode Equation

The carrier concentration of a PN junction is given in the figure and the minority carriers are labelled. What is the type of the given PN junction?

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