ch17 - Topic 17 : Metal-Semiconductor Junctions and...

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Unformatted text preview: Topic 17 : Metal-Semiconductor Junctions and Heterojunctions Fall 2007 ECE 3500 - Semiconductor Materials and Devices Learning Objectives In this topic you will learn: How metal-semiconductor junctions result in either ohmic or rectifying contacts How p-n junctions of dissimilar materials behave both at thermal equilibrium and under bias. Metal-Semiconductor Junctions The work function , , of a material is defined as the energy required to take an electron from the Fermi level to the vacuum level. vacuum level vacuum level E E F q q m q q S E E F metal metal semiconductor semiconductor q q S E E C E E V Metal-Semiconductor Junctions (contd) When a metal and a semiconductor are brought into intimate contact, Metal-Semiconductor Junctions (contd) Consider an n-type semiconductor...
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ch17 - Topic 17 : Metal-Semiconductor Junctions and...

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