act25 - Do NOT write on these sheets or take them with you!...

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Do NOT write on these sheets or take them with you! The next class needs them too! PHYS-1200 PHYSICS II SPRING 2005 Class 25 Activity: p and n Semiconductors A. Pure silicon at room temperature has an electron number density in the conduction band of about 5 ×10 15 m -3 and an equal density of holes in the valence band. Suppose that one of every 10 6 silicon atoms is replaced by a phosphorus atom. 1. Which type will the doped semiconductor be, n or p ? 2. What charge carrier number density will the phosphorus add? (Hint: See sample problem 41-6 on page 1154.) 3. What is the ratio of the charge carrier number density (electrons in the conduction band and holes in the valence band) in the doped silicon to that in pure silicon? B. Now you will investigate a rectifier that is formed by the junction of a p -type semiconductor with an n -type semiconductor. You have been supplied with a variable power supply, equipped with meters that read the output voltage and current, a semiconductor diode
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act25 - Do NOT write on these sheets or take them with you!...

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