SLIDE 1
PVMD
Delft University of Technology
Learning objectives
- What is a PIN junction
- Why is a PIN junction used for thin film silicon solar cells
- Importance of doped layers
PVMD Arno Smets Delft University of Technology Learning objectives - - PowerPoint PPT Presentation
PVMD Arno Smets Delft University of Technology Learning objectives - - PowerPoint PPT Presentation
PIN junction PVMD Arno Smets Delft University of Technology Learning objectives What is a PIN junction Why is a PIN junction used for thin film silicon solar cells Importance of doped layers Charge carrier transport mechanisms
SLIDE 2
SLIDE 3
Diffusion
Charge carrier transport mechanisms
Drift
E-Field
_ +
_ +
P-type N-type
Charge carrier density position
SLIDE 4
Diffusion length
a-Si:H LD < 300 nm c-Si LD ~ 300 μm
SLIDE 5
Charge carrier density
Diffusion
Charge carrier transport mechanisms
Drift
position
E-Field
_ +
_ +
P-type N-type
SLIDE 6
EFermi Intrinsic a-Si:H n-a-Si:H p-a-SiC:H
PIN junction
Valence band Conduction band
SLIDE 7
EFermi Intrinsic a-Si:H n-a-Si:H p-a-SiC:H
PIN junction
+ _
SLIDE 8
PIN cell
i-a-Si:H Metal back contact Glass superstrate TCO p-a-SiC:H n-a-Si:H
p i n
_ +
SLIDE 9
Doped layer requirements : 1. Optimal refractive index
- 2. High bandgap energy
3. Adequate transverse conductivity
PIN cell
p i n
_ +
SLIDE 10
Charge carrier density Diffusion Drift position E-Field _ + _ + P-type N-type i-a-Si:H Metal back contact glass TCO ZnO/SiOx back reflector p-a-SiC:H n-a-Si:H
p i n _ +
Window layer requirements : 1. Optimal refractive index
- 2. High bandgap energy
3. Adequate transverse conductivity