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ELCT363_Lecture3_SemiconductorsI

# ELCT363_Lecture3_SemiconductorsI - Conductance and...

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ELCT 363: Intro. to Microelectronics Dr. Mandal/Fall 2011 Lecture 3; Slide 1 Conductance and Conductivity Electrical conductance measures how easily electricity flows through a bar or wire made out of conducting material. The conductance G of an object of cross-sectional area A and length L can be determined from the material's conductivity σ by the following formula: Conductivity is a measure of a material's ability to conduct electrical current Units: Siemens/meter or S/m What is the relationship between conductivity ( σ ) and resistivity ( r )? Ohm’s Law (V=IR) could be written as: The higher is σ , the higher is G and the higher is the current. s = 1/r L A L A G σ =

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ELCT 363: Intro. to Microelectronics Dr. Mandal/Fall 2011 Lecture 3; Slide 2 Material’s conductivity is determined by : 1) Number of free electron concentration, n 2) Mobility of electron (how fast electrons are moving), m q is the charge of an electron which is 1.60 x 10 -19 C The Origin of Conductivity
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ELCT363_Lecture3_SemiconductorsI - Conductance and...

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