Questions

EESM5200 (L2) Quiz 02

Multiple dropdown selections

The electric field along a PN junction under open circuit condition is given below. Indicate how the labelled points of the graph will change under when p-side (you have to figure out which is the p-side yourself) doping concentration increases. Point C: [ Select ] move left move right no horizontal movement Point D: [ Select ] move left move right no horizontal movement Point E: [ Select ] move up move down no vertical movement Slope S1: [ Select ] steeper gentler no change Slope S2: [ Select ] steeper gentler no change How would E move if an illumination is shine on the junction? move up

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Step-by-Step Analysis

To tackle this PN-junction problem, I will analyze how each labeled feature would respond when the p-side doping concentration increases, and then relate those changes to the options provided. First, consider what happens when the p-side is doped more heavily. A higher acceptor concentration on the p-side tends to increase the built-in potential across the junction and can alter the shape of the electric field distribution as the depletion region adjusts to maintain charge neutrality. This typically results in a shift of characteristic points along the x-axis (toward the p-side or n-side depending on the net field balance) and a change in the slope of the E-field curve where depl......Login to view full explanation

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