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Nov 30, 2023 241 likes •521 views

Advanced Concepts - part 2 Ren van Swaaij PVMD Delft University of Technology Learning objectives Advanced concepts based on crystalline silicon: Learning objectives Advanced concepts based on crystalline silicon: Silicon

SLIDE 1

PVMD

Delft University of Technology

Advanced Concepts - part 2

René van Swaaij

SLIDE 2

Learning objectives

Advanced concepts based on crystalline silicon:

SLIDE 3

Learning objectives

Advanced concepts based on crystalline silicon:
Silicon heterojunction (HIT)

SLIDE 4

Learning objectives

Advanced concepts based on crystalline silicon:
Silicon heterojunction (HIT)
Inter-digitated back contacted (IBC)

SLIDE 5

Learning objectives

Advanced concepts based on crystalline silicon:
Silicon heterojunction (HIT)
Inter-digitated back contacted (IBC)
Top performance: IBC + HIT

SLIDE 6

Silicon heterojunction solar cells

HIT: Heterojunction with Intrinsic Thin layer

Source figure: Sanyo (now Panasonic) Masuko et al., IEEE-JPV 4, 1433- 1435 (2014)

Efficiency up to 25.6%

SLIDE 7

Silicon heterojunction solar cells

1. Random texture for light

trapping

HIT: Heterojunction with Intrinsic Thin layer

Source figure: Sanyo (now Panasonic) Masuko et al., IEEE-JPV 4, 1433- 1435 (2014)

Efficiency up to 25.6%

SLIDE 8

Silicon heterojunction solar cells

1. Random texture for light

trapping

2. a-Si:H surface passivation

HIT: Heterojunction with Intrinsic Thin layer

Source figure: Sanyo (now Panasonic) Masuko et al., IEEE-JPV 4, 1433- 1435 (2014)

Efficiency up to 25.6%

SLIDE 9

Silicon heterojunction solar cells

1. Random texture for light

trapping

2. a-Si:H surface passivation
3. Bifacial design

HIT: Heterojunction with Intrinsic Thin layer

Source figure: Sanyo (now Panasonic) Masuko et al., IEEE-JPV 4, 1433- 1435 (2014)

Efficiency up to 25.6%

SLIDE 10

Silicon heterojunction solar cells

1. Random texture for light

trapping

2. a-Si:H surface passivation
3. Bifacial design
4. n-type c-Si: longer hole

lifetimes Þ longer diffusion length

HIT: Heterojunction with Intrinsic Thin layer

Source figure: Sanyo (now Panasonic) Masuko et al., IEEE-JPV 4, 1433- 1435 (2014)

Efficiency up to 25.6%

SLIDE 11

Silicon heterojunction solar cells

1. Random texture for light

trapping

2. a-Si:H surface passivation
3. Bifacial design
4. n-type c-Si: longer hole

lifetimes Þ longer diffusion length

5. Low cost and low

temperature processing

HIT: Heterojunction with Intrinsic Thin layer

Source figure: Sanyo (now Panasonic) Masuko et al., IEEE-JPV 4, 1433- 1435 (2014)

Efficiency up to 25.6%

SLIDE 12

Interdigitated back-contacted (IBC) solar cell

Efficiency up to 25.2%

Source figure: Sunpower Werner T, Analyst Day, 12 November, 2015, Slide 24

n p

SLIDE 13

Interdigitated back-contacted (IBC) solar cell

1. Random texture for light

trapping

2. Oxide layer for surface

passivation

Efficiency up to 25.2%

Source figure: Sunpower Werner T, Analyst Day, 12 November, 2015, Slide 24

n p

SLIDE 14

Interdigitated back-contacted (IBC) solar cell

1. Random texture for light

trapping

2. Oxide layer for surface

passivation

3. All contacts at back to

prevent shading

Efficiency up to 25.2%

Source figure: Sunpower Werner T, Analyst Day, 12 November, 2015, Slide 24

n p

SLIDE 15

Interdigitated back-contacted (IBC) solar cell

1. Random texture for light

trapping

2. Oxide layer for surface

passivation

3. All contacts at back to

prevent shading

4. Localized contacts: reduction

recombination loss

Efficiency up to 25.2%

Source figure: Sunpower Werner T, Analyst Day, 12 November, 2015, Slide 24

n p

SLIDE 16

Interdigitated back-contacted (IBC) solar cell

1. Random texture for light

trapping

2. Oxide layer for surface

passivation

3. All contacts at back to

prevent shading

4. Localized contacts: reduction

recombination loss

5. n-type c-Si: longer hole

lifetimes Þ longer diffusion length

Efficiency up to 25.2%

Source figure: Sunpower Werner T, Analyst Day, 12 November, 2015, Slide 24

n p

SLIDE 17

Interdigitated Back Contacted solar cell

1. Larger cross-section

contacts since they are at the back

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Interdigitated Back Contacted solar cell

1. Larger cross-section

contacts since they are at the back

2. Area of p+ region larger

due to diffusion length

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Best of two worlds: IBC-HIT

Kaneka Corporation, Nature Energy 2, (2017)

Efficiency of 26.6%

ARC n-type c-Si a-Si:H passivation i-a-Si:H p-a-Si:H / n-a-Si:H pattern

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Best of two worlds: IBC-HIT

1. Texture for light trapping

Efficiency of 26.6%

ARC n-type c-Si i-a-Si:H

Kaneka Corporation, Nature Energy 2, (2017)

a-Si:H passivation p-a-Si:H / n-a-Si:H pattern

SLIDE 21

Best of two worlds: IBC-HIT

1. Texture for light trapping
2. a-Si:H surface passivation

Efficiency of 26.6%

ARC n-type c-Si i-a-Si:H

Kaneka Corporation, Nature Energy 2, (2017)

p-a-Si:H / n-a-Si:H pattern a-Si:H passivation

SLIDE 22

Best of two worlds: IBC-HIT

1. Texture for light trapping
2. a-Si:H surface passivation
3. All contacts at back to prevent

shading

Efficiency of 26.6%

ARC n-type c-Si i-a-Si:H

Kaneka Corporation, Nature Energy 2, (2017)

p-a-Si:H / n-a-Si:H pattern a-Si:H passivation

SLIDE 23

Best of two worlds: IBC-HIT

1. Texture for light trapping
2. a-Si:H surface passivation
3. All contacts at back to prevent

shading

4. Localized contacts: reduction

recombination loss

Efficiency of 26.6%

ARC n-type c-Si i-a-Si:H

Kaneka Corporation, Nature Energy 2, (2017)

p-a-Si:H / n-a-Si:H pattern a-Si:H passivation

SLIDE 24

Best of two worlds: IBC-HIT

1. Texture for light trapping
2. a-Si:H surface passivation
3. All contacts at back to prevent

shading

4. Localized contacts: reduction

recombination loss

5. n-type c-Si: longer hole

lifetimes Þ longer diffusion length

Efficiency of 26.6%

ARC n-type c-Si i-a-Si:H

Kaneka Corporation, Nature Energy 2, (2017)

p-a-Si:H / n-a-Si:H pattern a-Si:H passivation

SLIDE 25

Summary

Silicon heterojunction cell improves open circuit

voltage

SLIDE 26

Summary

Silicon heterojunction cell improves open circuit

voltage

IBC all contacts at the back to optimise absorption

SLIDE 27

Summary

Silicon heterojunction cell improves open circuit

voltage

IBC all contacts at the back to optimise absorption
IBC + HIT combines the best of both worlds for