You are given the large signal model for a P+/N junction diode as shown in the figure. Which of the following change will cause the most reduction of the series resistance RS?

Question

BlackTom AI · Accepted Answer

We are asked which change will cause the largest reduction in the series resistance RS of a P+/N junction diode as shown.
Option 1: increase the P+ doping. Increasing the donor/acceptor concentration on the P+ side would raise the hole concentration in the P+ region, reducing its resistive term somewhat, but the overall series resistance RS is influenced by the combined resistive path through both regions and the geometry. Since the P+ side typically has lower mobility for holes and may be thinner or less dominant in the current path, the impact on RS may be present but relatively modest.
Option 2: reduce the P+ doping. Lowering the P+ doping would decrease hole concentration and increase resistivity in the P+ region, which tends to increase RS, not reduce it, so this choice would worsen RS rather than reduce it.
Option 3: increase the N doping. Increasing the dopant concentration on the N side boosts electron concentration and, because electron mobility is relatively high, the resistive contribution of the N region drops more substantially. This tends to reduce the overall series resistance more effectively, especially if the N side is a major part of the current path.
Option 4: reduce the N doping. Lowering the N-side doping reduces carrier concentration and increases resistivity in the N region, which would increase RS, not reduce it.
In summary, choices that raise carrier density and support higher conductivity in the current path tend to lower RS, while choices that lower carrier density raise RS. Between the options, increasing the N doping most directly reduces the primary resistive contribution from the N-side path due to higher mobility and the typically larger role of the N region in the current transport, making it the most effective way to reduce RS.

You are given the large signal model for a P+/N junction diode as shown in the figure. Which of the following change will cause the most reduction of the series resistance RS?单项选择题

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You are given the large signal model for a P+/N junction diode as shown in the figure. Which of the following change will cause the most reduction of the series resistance RS?单项选择题

类似问题

A reverse bias is applied to a PN junction and a light is shined onto it. Assume the energy of the light is close to the bandgap of the semiconductor material. Which of the following change is likely to give to largest increase the magnitude of the reverse current of the PN junction?

Match the items to the descriptions 1: ____ 2: ____ 3: ____

Match the items to the descriptions 1: ____ 2: ____ 3: ____

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What was the world's first widely adopted biodiversity policy?

The aim of the Paris Agreement is to ensure that the earth’s preindustrial temperature is not exceeded by more than º Celsius.

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希望你的学习变得更简单

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