lecture_4_chex42

lecture_4_chex42 - Device physics and some common devices...

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Unformatted text preview: Device physics and some common devices Device physics and some common devices • The goal of this lecture is 1) to introduce some basic concepts in carrier transport, generation and recombination in semiconductors 2) and to discuss the physics behind some basic and common electronic devices such as the p-n junction diode and metal-Oxide- Semiconductor Field Effect Transistor. Carrier Transport in Semiconductors Carrier Transport in Semiconductors • Consider the motion of a charged particle with charge Z j (±1) under electric field E r ≅ − = = v m C E e Z dt v d m F * j D j * j r r r r Acceleration by Electric field “ drag” due to collisions with lattice atoms E Z E m C e Z v j j * j D j dj r r r µ = = Mobility Ohm’s law, conductivity and Ohm’s law, conductivity and resistivity resistivity ! If we have N j carrier concentration the current density 1 2 2 = = = = ) Z ( for E e N J E e ) Z ( N v ) e Z ( N J j j j j j j j dj j j j r r r r r µ µ ! This is Ohm’s law E J j...
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This note was uploaded on 12/29/2011 for the course CHE 142 taught by Professor Ceweb during the Fall '09 term at UCSB.

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lecture_4_chex42 - Device physics and some common devices...

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