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02_pn - EECE 416/501 Analog Circuit Design Review of PN...

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EECE 416/501 Analog Circuit Design Review of PN Junctions Christopher M. Twigg Assistant Professor Department of Electrical and Computer Engineering B INGHAMTON U N I V E R S I T Y S T A T E U N I V E R S I T Y O F N E W Y O R K September 1, 2009
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PN Junctions : Semiconductor Materials Intrinsic Semiconductor S i h + e - P-Type N-Type + + - fixed ions + + + - - - - EECE 416/501, C. M. Twigg September 1, 2009 2/10
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PN Junctions : Carrier Transport Diffusion h + e - + - 0 V h + h + e - e - h + h + h + h + h + h + h + e - e - e - e - e - e - e - Drift h + e - + - + V h + h + e - e - e - h + h + e - What happens if we make a junction? EECE 416/501, C. M. Twigg September 1, 2009 3/10
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PN Junctions : Zero Bias P N + - V = 0 - - - - - - - - - - + + + + + + + + + + E C E V What happens if we reverse bias the junction? EECE 416/501, C. M. Twigg September 1, 2009 4/10
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PN Junctions : Reverse Bias P N + - -V E C E V E C e - h + h + h + h + h + h + h + h + h + h + h + h + h + h + h + h + e - e - e - e - e - e - e - e - e - e - e - e - e - e - e - - - - - - - - - - - + + + + + + + + + + e - e - e - e - e - h + h + h + h + h + E V What happens if we forward bias the junction? EECE 416/501, C. M. Twigg September 1, 2009 5/10
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PN Junctions : Forward Bias P N + - +V E C E V h + h + h + h + h + h + h + h + h + h + h + h + h + h + h + e - e - e - e - e - e - e - e - e - e - e - e - e - e - e - e - h + - - - - - - - - - - + + + + + + + + + + e - e - e - e - e - h + h + h + h + h + h + e - E V E C What is the voltage-to-current response? EECE 416/501, C. M. Twigg September 1, 2009 6/10
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PN Junctions
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