solar cell operation - edx
TRANSCRIPT
![Page 1: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/1.jpg)
Arno Smets
Solar Cell OperationDesign Rules: utilization of band gap energy
Week 3.4
![Page 2: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/2.jpg)
2. Spectral Utilization
Design Rules Solar Cells
1. Band Gap Utilization
3. Light Trapping
Delicate Interplay
![Page 3: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/3.jpg)
2. Spectral Utilization
Design Rules Solar Cells
1. Band Gap Utilization
3. Light Trapping
Delicate Interplay
![Page 4: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/4.jpg)
2. Spectral Utilization
Design Rules Solar Cells
1. Band Gap Utilization
3. Light Trapping
Delicate Interplay
![Page 5: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/5.jpg)
2. Spectral Utilization
Design Rules Solar Cells
1. Band Gap Utilization
3. Light Trapping
Delicate Interplay
![Page 6: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/6.jpg)
p
n
EFn
EFp
qVoc
Band gap utilization
1ln
0JJ
qTkV PHB
OC
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p
n
EFn
EFp
qVoc
Band gap utilization
1ln
0JJ
qTkV PHB
OC
Voc 2kT
qln
GL0
ni
![Page 8: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/8.jpg)
Charge Carrier Recombination
Radiative Auger SRH
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Charge Carrier Recombination
Shockley Read Hall1
0 tN
Voc 2kT
qln
GL0
ni
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Charge Carrier Recombination
Radiative Auger SRH
![Page 11: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/11.jpg)
Charge Carrier Recombination
Relectron
kn2p e ,Aug
pR 1kn2
Rhole
kp2n h,Aug
nR 1kp2
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Charge Carrier Recombination
Relectron
kn2p e ,Aug
pR 1kn2
Rhole
kp2n h,Aug
nR 1kp2
![Page 13: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/13.jpg)
Charge Carrier Recombination
![Page 14: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/14.jpg)
Momentum
Energy
Indirect band gap
photonphonon
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Momentum
Energy
Direct band gap
photon
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Momentum
Energy
Indirect band gap: c‐Si
photonphonon
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Momentum
Energy
Direct band gap: GaAs
photon
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Band gap utilization: .....the Voc is limited by
Radiative Auger SRH
Defect‐rich absorber layer
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Band gap utilization: .....the Voc is limited by
Radiative Auger SRH
Defect‐free indirect band gap
![Page 20: Solar Cell Operation - edX](https://reader033.vdocuments.us/reader033/viewer/2022041609/62530956b3ba0e63f54fd476/html5/thumbnails/20.jpg)
Band gap utilization: .....the Voc is limited by
Radiative Auger SRH
Defect‐free direct band gap
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Diffusion Length
Diffusion length:
p‐doped
Le De e Lh ehhh LDL
n‐doped
---
- - -- - -- - -
+ + + +
+ + + +
+ + + +
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Minority carrier diffusion length
Ld
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Relation between diffusion length and typical thickness of solar cells
Ld
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p
n
EFn
EFp
qVoc