Transcript Chapter VIIIa Microcrystalline Silicon Solar Cells May 25, 2016 1

Chapter VIIIa
Microcrystalline Silicon Solar Cells
May 25, 2016
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10~20nm
nanocrystals
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Increasing in silane concentration
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Optical properties
Urbach tail
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Electronic Transport Properties
Li 
 (Vbi  V )
xi
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Ic/(Ic + Ia)
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Doped Layers
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Difference between a-Si:H and mc-Si:H
Requires a much longer growth time than a-Si:H.
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Optimization of TCO
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Increase in defect
density in i layer
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Effect of Oxygen or Dopant contamination
on the I layer
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Efficiency of a micromorph
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Micromorph Tandem Solar Cell
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To cope with the degradation of top cell, one can design a
cell where the Jsc is lower in the microcrystalline bottom cell
than in the amorphous top cell.
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Or one can design a thinner top cell to reduce the
degradation effect, but adding ZnO layer in between to
increase light trapping of the top cell and increase Jsc.
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