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Bandtail Limits to Solar Conversion Efficiencies in Amorphous Silicon Solar Cells

  • K. Zhu (a1), J. Yang (a2), W. Wang (a1), E. A. Schiff (a1), J. Liang (a1) and S. Guha (a2)...

Abstract

We describe a model for a-Si:H based pin solar cells derived primarily from valence bandtail properties. We show how hole drift-mobility measurements and measurements of the temperature-dependence of the open-circuit voltage VOC can be used to estimate the parameters, and we present VOC(T) measurements. We compared the power density under solar illumination calculated with this model with published results for as-deposited a-Si:H solar cells. The agreement is within 4% for a range of thicknesses, suggesting that the power from as-deposited cells is close to the bandtail limit.

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*corresponding author; easchiff@syr.edu

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2.The bandtail density-of-states evaluated at the valence bandedge gv0 ≡ g(Ev) is also required by some modeling programs such as AMPS 1D. The relationship to NV is [7]: This relationship is valid only for kT < ΔEV .
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Bandtail Limits to Solar Conversion Efficiencies in Amorphous Silicon Solar Cells

  • K. Zhu (a1), J. Yang (a2), W. Wang (a1), E. A. Schiff (a1), J. Liang (a1) and S. Guha (a2)...

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