Questions
Questions

EESM5200 (L2) Part I: Topic 10 - Metal Semiconductor Contact

Multiple choice

For a metal with workfunction close to the middle of the silicon bandgap is put in contact with a n-type silicon. The amount of carriers that are able to move freely across the junction depends on which of the following quantity(ies)?

Options
A.Work function of the metal
B.Work function of the silicon
C.Electron affinity of the silicon
D.Doping concentration of the silicon
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Step-by-Step Analysis
First, consider what governs the flow of carriers across a metal–semiconductor junction. The barrier for carriers to move from metal into silicon is set by the relative alignment of energy levels at the interface, which depends on the metal’s work function and the semiconductor’s electron affinity. Option 1: Work function of the metal. This directly influences the Schottky barrier height at the interface; a larger metal work function gene......Login to view full explanation

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