Electronics-I Lecture 13

Electronics-I Lecture 13 - PNJunction Opencircuitconditions...

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Lecture 13 Electronics I 1 PN Junction Open-circuit conditions + in p-type indicate  majority holes - in n-type indicate   majority electrons generated by thermal  ionization bound charges
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Lecture 13 Electronics I 2 PN Junction Diffusion Current due to  majority carriers Holes diffuse across  junction to N side Electrons diffuse across  junction to P side I D  Diffusion current from P  to N Depletion Region Majority Holes combine  with Majority Electrons  across PN junction Uncovered Bound charges Space-charge region
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Lecture 13 Electronics I 3 PN Junction Electric Field Charges in depletion region  establish an electric field Potential difference across the  region N side at positive potential  relative to P side Potential difference opposes  diffusion of majority holes and  electrons Diffusion current I D  dependant  on potential difference
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Electronics I 4 PN junction Drift current Drift Current electric field Drift current I
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Electronics-I Lecture 13 - PNJunction Opencircuitconditions...

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