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Arno Smets
Working Principle of a Semiconductor Based Solar Cell Transport of - - PowerPoint PPT Presentation
Working Principle of a Semiconductor Based Solar Cell Transport of - - PowerPoint PPT Presentation
Working Principle of a Semiconductor Based Solar Cell Transport of Charge Carriers Week 2.3.3 Arno Smets Diffusion Drift E-Field Random movement = no net movement J e = qD e dn/dx Diffusion density Diffusion J e = qD e dn/dx density
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Random movement = no net movement
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Diffusion
density Je = qDe dn/dx
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Diffusion
Je = qDe dn/dx density
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Diffusion
Je = qDe dn/dx density
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Diffusion
dn/dx=0 J=0 density
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Drift
E-Field Hole Electron
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Drift
Current density Density Charge Mobility Electric field
Jh = pq hE Je = nq eE
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Drift
E-Field Hole Electron
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E-Field
Diffusion Drift
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Recombination
Charge Carrier Recombination
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Radiative recombination
Charge Carrier Recombination
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Auger recombination
Charge Carrier Recombination
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Shockley-Read-Hall (SRH) recombination
Charge Carrier Recombination
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Diffusion Length
Lh Le
L= D t
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Diffusion Length
Lh Le
L= D t
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Diffusion Length
Lh Le
L= D t
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Diffusion Length
Transport by diffusion limited by minority carriers Diffusion length: p-doped
Le= Det e < Lh
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Diffusion Length
Transport by diffusion limited by minority carriers Diffusion length: p-doped
Le= Det e < Lh
e h h h
L D L
n-doped
- +
+ + + + + + + + + + +
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E-Field
Diffusion Drift
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Thank you for your attention!
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