Which of the following description of the depletion of the PN junction is correct? Check all correct answers.

Question

BlackTom AI · Accepted Answer

To analyze the depletion region of a PN junction, we need to consider what remains when carriers diffuse and recombine near the junction. 
Option 1: 'Behaves like an insulator' — During depletion, free carriers are largely removed from the region, leaving fixed ionized donors and acceptors. This region has very low conductivity, effectively acting like an insulator to small-signal currents until a strong enough forward or reverse bias is applied. Hence this statement is a reasonably accurate description. 
Option 2: 'Behaves like a conductor' — This is not correct. The depletion zone does not provide a pathway for easy charge flow; the mobile carriers are depleted, and the region resists current flow, which is the opposite of conductive behavior. 
Option 3: 'The p-side contains positive charges and the n-side contains negative charges' — This reverses the actual charge distribution. In the depletion region, the p-side near the junction leaves behind negatively charged acceptor ions, while the n-side near the junction leaves behind positively charged donor ions. Therefore this description is incorrect. 
Option 4: 'The p-side contains negative charges and the n-side contains positive charges' — This correctly reflects the ionized dopant charges left behind in the depletion region: negative on the p-side and positive on the n-side. This is consistent with the built-in electric field directing from the n-side toward the p-side. Therefore this statement is correct.

EESM5200 (L2) Part I: Topic 4 - PN Junction Formation

Which of the following description of the depletion of the PN junction is correct? Check all correct answers.

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