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Understanding I-V Curves for PN Junctions and Diodes

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lynsey
11 diapositives · 235 Views · Sep 29, 2014

This document by Richard Summerfield discusses the I-V (current-voltage) characteristics of diodes formed from p-type and n-type semiconductor materials. It explains the concepts of forward and reverse bias, highlighting how a diode conducts current in one direction. The ideal diode behavior is contrasted with real diode performance, showcasing the threshold voltage for conduction and the effects of reverse bias leading to potential breakdown. Comprehensive insights include typical I-V curves and the implications for electronic applications.

#understanding i-v curves for pn junctions and diodes #understanding i-v curves for pn junctions and diodes ppt #powerpoint #presentation
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  1. MTRX N410 – I-V Curves for PN Junctions Richard Summerfield Programme Chair – Engineering Ras Al Khaimah Men’s College R. Summerfield

  2. MTRX N410 – I-V Curves for PN Junctions A diode is an electronic device made from p and n type semiconductor material. The anode is connected to the p type and the cathode to the n type. Anode Cathode Cathode Anode R. Summerfield

  3. MTRX N410 – I-V Curves for PN Junctions The Diode only allows a current to flow through it one direction: - From Anode to Cathode This is known as Forward Bias R. Summerfield

  4. MTRX N410 – I-V Curves for PN Junctions When a diode is Forward biased, it’s anode is connected to a more positive voltage than the cathode. R. Summerfield

  5. MTRX N410 – I-V Curves for PN Junctions When a diode is reverse biased, its cathode is connected to a more positive voltage and it will not conduct. R. Summerfield

  6. MTRX N410 – I-V Curves for PN Junctions An Ideal Diode An ideal diode would act like a conductor when it is forward biased and an insulator when reverse biased. Reverse Biased Forward Biased R. Summerfield

  7. MTRX N410 – I-V Curves for PN Junctions A typical diode has a different I-V curve. It does not conduct until a ‘threshold’ junction voltage is released. A small current will ‘leak’ through in reverse bias. If the reverse voltage is large enough, it will break down. R. Summerfield

  8. MTRX N410 – I-V Curves for PN Junctions Forward Bias The diode will not conduct until the pn junction depletion layer has been overcome. Typically 0.7 volts for Silicon 0.3 volts for Germanium R. Summerfield

  9. MTRX N410 – I-V Curves for PN Junctions Reverse Bias A small current will leak in reverse bias as some electrons will manage to cross the depletion layer due to the effects of thermal energy. If a sufficiently large reverse voltage is applied the diode will breakdown. The breakdown voltage will depend on the diode type. R. Summerfield

  10. MTRX N410 – I-V Curves for PN Junctions Typical I-V Curve for a Diode Note how the scales on the Forward and Reverse Bias areas of the graph are different. The scales used ‘exaggerate’ the curve to show the differences from an ideal diode. R. Summerfield

  11. MTRX N410 – I-V Curves for PN Junctions R. Summerfield