Supposed you have a P+/N junction operating in the region where its current is dominated by recombination current in the depletion region. How would the current change when the doping of the N region is reduced?

Question

BlackTom AI · Accepted Answer

We start by identifying the scenario: a P+/N junction where the current is dominated by recombination current in the depletion region. Now evaluate each option:

Option 1: increase
- If the N-region doping is reduced, the electron concentration in the depletion region drops. Recombination in the depletion region typically requires available electrons to recombine with holes; fewer electrons mean fewer recombination events, so the recombination current would not rise. Therefore this option is unlikely.

Option 2: decrease
- With less donor doping in the N region, the electron concentration decreases, reducing the likelihood of electron–hole recombination events in the depletion region. Although the depletion width tends to widen as doping drops, the dominant factor for recombination current in this regime is the availability of carriers to recombine. The net effect is a reduction in recombination current, making this option plausible.

Option 3: remain unchanged
- It is unlikely that changing the N-doping would leave the recombination current exactly unchanged, because carrier concentrations and the depletion-region properties are altered. In semiconductor junctions, doping levels directly affect recombination pathways, so a constant current is not expected.

Option 4: No answer text provided.
- This option is not a meaningful technical choice about the device behavior; it merely acknowledges missing text rather than addressing the physics. In the given context, we can disregard it as a valid physical answer.

In summary, the physics suggests that reducing N-doping lowers the availability of electrons for recombination in the depletion region, leading to a smaller recombination current. The other options contradict carrier-recombination dependencies or rely on an absent text, making them incorrect.

EESM5200 (L2) Part I: Topic 7 - Real PN Junction Characteristics

Supposed you have a P+/N junction operating in the region where its current is dominated by recombination current in the depletion region. How would the current change when the doping of the N region is reduced?

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