diodes - Diodes Function Electrical ,gate Current only...

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Diodes
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Function Electrical ‘gate’ Current only flows one way Forward biased Current flows Reverse biased Blocks current + - - +
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pn junction diode I-V characteristics -10 -5 0 5 10 15 20 -6 -5 -4 -3 -2 -1 0 1 2 3 4 Applied voltage Curren I-V characteristic Forward Bias Reverse Bias Breakdown Reverse saturation current 0.7V Switch-on Depletion region narrowing
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pn construction Semiconductor material n-type Excess electrons p-type Excess holes ‘Join’ together Depletion region Redistribution of charge carriers Contact potential 0.7V
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p-type material n-type material Holes Holes diffuse into the n-type and ‘swallow’ electrons Electrons diffuse into the p-type and ‘fill holes’ Depletion region formed No free charge carriers 0.7V contact potential pn construction
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Forward bias Depletion region narrows as applied voltage approaches 0.7V Applied voltage above 0.7V depletion region is removed charge carriers can flow V< 0.7V V> 0.7V
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Reverse bias Depletion region extends Higher voltage Breakdown Current flow V< 0V V<< 0V
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diodes - Diodes Function Electrical ,gate Current only...

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