ELCT363_Lecture14_Excess_Carriers

ELCT363_Lecture14_Excess_Carriers - ELCT 363 Intro to...

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Unformatted text preview: ELCT 363: Intro. to Microelectronics Lecture 14; Slide Mandal/Fall 2011 Ø Homework #2 is due today Ø Midterm will be on Thursday, October 27th § Closed-books/Closed-notes exam, but you may bring a face page of equations or notes § No cell phones/smart phones are allowed (no texting or web browsing) § Exam will cover Lecture #1 to Lecture #16 § Multiple Choices and Numerical problems § (20% of final grade) Announcement 1 ELCT 363: Intro. to Microelectronics Lecture 14; Slide Mandal/Fall 2011 Drift Current and Drift Velocity Ø The electric current due to electric field is called the Drift Current. Ø Drift current density (current per unit area): 2 pE qμ nE qμ J J J p n p,drift n,drift drift + = + = The total (electron + hole) drift current density: ( ) drift n p J q n p E μ μ = + Ø The drift velocity is the average velocity that a particle, such as an electron, attains due to an electric field. Ø Average electron velocity (drift velocity, v ) is proportional to the electric field E : v E, v = μ E Υνιτ οφ μοβιλιτψ, μ = v /E [(m/s)/(V/m) = m2/(V.s)] ELCT 363: Intro. to Microelectronics Lecture 14; Slide Mandal/Fall 2011 Diffusion Current Ø Diffusion is due to concentration difference between two regions of a semiconductor Ø The carriers will move from higher concentration region to the lower one....
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This note was uploaded on 10/25/2011 for the course ELCT 363 taught by Professor Mandal during the Spring '11 term at South Carolina.

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ELCT363_Lecture14_Excess_Carriers - ELCT 363 Intro to...

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