1. PN Junction Diode SNS COLLEGE OF ENGINEERING
Kurumbapalayam(Po), Coimbatore –
Accredited by NAAC-UGC with ‘A’ Grade
Approved by AICTE & Affiliated to Anna University, Chennai
DEPARTMENT OF ELECTRICAL AND ELECTRONICS
ENGINEERING
PN Junction Diode

2. Unit3/BEEE/Semiconductor Device
Objectives
To understand the fundamentals of semiconductors
To learn about formation of the Depletion region in PN Junction diode
To realize the importance of biasing of PN Junction diode
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Unit3/BEEE/Semiconductor Device

3. Introduction to Semiconductors
Intrinsic Semiconductor
Extrinsic Semiconductor
N – Type Semiconductor (Pentavalent Impurities -Antimony, Arsenic & Phosphorous, etc..)
P – Type Semiconductor (Trivalent Impurities -
Boron, Aluminum & Gallium, etc..)
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Unit3/BEEE/Semiconductor Device

4. Doping Formation of Silicon
N-Type Semiconductor
P-Type Semiconductor
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5. Unit3/BEEE/Semiconductor Device
PN Junction Diode
Diode Symbol
1 N 4001
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Unit3/BEEE/Semiconductor Device

6. Unit3/BEEE/Semiconductor Device
Analogy
Diode
Non Return Valve
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7. Biasing of PN Junction Diode
VD = 0 volt
Forward Bias
VD = 0.6 volt
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8. Activity Match the following
Resistor
Capacitor
Diode
NPN Transistor a. b. c. d.
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Unit3/BEEE/Semiconductor Device

9. Activity Match the following
Resistor
Capacitor
Diode
NPN Transistor
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Unit3/BEEE/Semiconductor Device

10. Activity Match the following
BHARATHI RAJA
ATLEE
SHANKAR
MANIRATHNAM
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Unit3/BEEE/Semiconductor Device

11. Activity Match the following
BHARATHI RAJA
ATLEE
SHANKAR
MANIRATHNAM
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Unit3/BEEE/Semiconductor Device

12. Biasing of PN Junction Diode
VD = 0 volt
Reverse Bias
VD = 2 volt
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13. Unit3/BEEE/Semiconductor Device
Evaluation
In which bias diode will act as open switch?
During reverse bias the width of depletion region increase or decrease?
In which bias diode will act as closed switch?
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Unit3/BEEE/Semiconductor Device

14. Unit3/BEEE/Semiconductor Device
Thank You !
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Unit3/BEEE/Semiconductor Device