PVMD Ren van Swaaij Delft University of Technology Learning - - PowerPoint PPT Presentation

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PVMD Ren van Swaaij Delft University of Technology Learning - - PowerPoint PPT Presentation

Nov 20, 2023 142 likes •825 views

Generation/Recombination Current PVMD Ren van Swaaij Delft University of Technology Learning objectives Reverse bias: generation current Learning objectives Reverse bias: generation current Forward bias: recombination current

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SLIDE 1

PVMD

Delft University of Technology

Generation/Recombination Current

René van Swaaij

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SLIDE 2

Learning objectives

  • Reverse bias: generation current
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SLIDE 3

Learning objectives

  • Reverse bias: generation current
  • Forward bias: recombination current
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SLIDE 4

Learning objectives

  • Reverse bias: generation current
  • Forward bias: recombination current
  • The ideality factor
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SLIDE 5

Space charge region under reverse bias

EVp ECp EVn ECn EFi EFp EFn

p-type n-type

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SLIDE 6

Space charge region under reverse bias

EVp ECp EVn ECn EFi EFp

p-type n-type

qVR EFn

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SLIDE 7

Recombination in the space charge region

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SLIDE 8

Recombination in the space charge region

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SLIDE 9

Detailed balance

1. 2. 3. 4.

+ +

  • +

+

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SLIDE 10

Detailed balance

1. 2. 3. 4.

+ +

  • +

+

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SLIDE 11

Detailed balance

1. 2. 3. 4.

+ +

  • +

+

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SLIDE 12

Detailed balance

1. 2. 3. 4.

+ +

  • +

+

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SLIDE 13

Detailed balance

1. 2. 3. 4.

+ +

  • +

+

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SLIDE 14

Detailed balance

1. 2. 3. 4.

+ +

  • +

+

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SLIDE 15

Detailed balance

1. 2. 3. 4.

+ +

  • +

+

slide-16
SLIDE 16

Detailed balance

1. 2. 3. 4.

+ +

  • +

+

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SLIDE 17

Recombination in the space charge region

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SLIDE 18

Recombination in the space charge region

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SLIDE 19

Reverse bias: generation current

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SLIDE 20

Reverse bias: generation current

Reverse bias:

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SLIDE 21

Reverse bias: generation current

Reverse bias:

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SLIDE 22

Reverse bias: generation current

Reverse bias:

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SLIDE 23

Reverse bias: generation current

Reverse bias:

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SLIDE 24

Reverse bias: generation current

Reverse bias:

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SLIDE 25

Reverse bias: generation current

Reverse bias:

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SLIDE 26

Reverse bias: generation current

Reverse bias:

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SLIDE 27

+ + +

  • EVp

ECp EVn ECn EFi EFp

p-type n-type

Space charge region under reverse bias

EFn

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SLIDE 28

+ + +

  • E-field

EVp ECp EVn ECn EFi EFp

p-type n-type

Space charge region under reverse bias

EFn

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SLIDE 29

+ + +

  • E-field

EVp ECp EVn ECn EFi EFp

p-type n-type

Space charge region under reverse bias

EFn

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SLIDE 30

Reverse bias: generation current

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SLIDE 31

Reverse bias: generation current

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SLIDE 32

Reverse bias: generation current

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SLIDE 33

Reverse bias: generation current

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SLIDE 34

Reverse bias: generation current

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SLIDE 35

Voltage dependence

Va ln (J)

ln (JS)

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SLIDE 36

Voltage dependence

Va ln (J)

ln (JS)

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SLIDE 37

Space charge region under forward bias

p-type n-type

EFi EFp EFn EVp ECp EVn ECn

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SLIDE 38

Space charge region under forward bias

p-type n-type

EFi EFp EFn qVa EVp ECp EVn ECn

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SLIDE 39

EVp EVn

p-type n-type

ECp ECn

Space charge region under forward bias

EFi EFp EFn qVa

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SLIDE 40

EVp EVn

p-type n-type

ECp ECn EFi EFp EFn qVa

Space charge region under forward bias

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SLIDE 41

EVp EVn

p-type n-type

ECp ECn EFi EFp EFn qVa

Space charge region under forward bias

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SLIDE 42

EVp EVn

p-type n-type

ECp ECn EFi EFp EFn qVa

Space charge region under forward bias

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SLIDE 43

Recombination rate through the space charge region

  • 6 -5
  • 3
  • 4
  • 1
  • 2

1 2 4 3 5 6 Relative distance through space charge region Relative recombination rate

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SLIDE 44

Recombination rate through the space charge region

  • 6 -5
  • 3
  • 4
  • 1
  • 2

1 2 4 3 5 6 Relative distance through space charge region Relative recombination rate Maximum recombination

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SLIDE 45

Forward bias: recombination current

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SLIDE 46

Forward bias: recombination current

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SLIDE 47

Forward bias: recombination current

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SLIDE 48

Forward bias: recombination current

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SLIDE 49

Forward bias: recombination current

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SLIDE 50

Forward bias: recombination current

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SLIDE 51

Forward bias: recombination current

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SLIDE 52

Forward bias: recombination current

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SLIDE 53

Forward bias: recombination current

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SLIDE 54

Forward bias: recombination current

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SLIDE 55

Forward bias: recombination current

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SLIDE 56

Forward bias: recombination current

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SLIDE 57

Forward bias: recombination current

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SLIDE 58

Forward bias: recombination current

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SLIDE 59

Forward bias: recombination current

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SLIDE 60

Forward bias: recombination current

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SLIDE 61

Forward bias: recombination current

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SLIDE 62

Current in forward bias

Recombination current, Jrec (slope = ½) ln(JR0) ln(Js) ln(J)

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SLIDE 63

Current in forward bias

Ideal diffusion current, JD (slope = 1) ln(JR0) ln(Js) ln(J) Recombination current, Jrec (slope = ½)

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SLIDE 64

Current in forward bias

Ideal diffusion current, JD (slope = 1) ln(JR0) ln(Js) ln(J) Recombination current, Jrec (slope = ½) Total current

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SLIDE 65

Summary

  • Generation current:
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SLIDE 66

Summary

  • Generation current:
  • Recombination current:
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SLIDE 67

Summary

  • Generation current:
  • Recombination current:
  • The ideality factor: