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A Study of a-Si:H/a-SiGe:H Tandem Solar Cells and Modules

Published online by Cambridge University Press:  16 February 2011

Yuan-Min Li ,
L. Yang ,
M.S. Bennett ,
L. Chen ,
F. Jackson ,
K. Rajan  and
R.R. Arya
Yuan-Min Li
Affiliation:
Solarex Corporation, Thin Film Division, 826 Newtown-Yardley Road, Newtown, Pennsylvania, 18940
L. Yang
Affiliation:
Solarex Corporation, Thin Film Division, 826 Newtown-Yardley Road, Newtown, Pennsylvania, 18940
M.S. Bennett
Affiliation:
Solarex Corporation, Thin Film Division, 826 Newtown-Yardley Road, Newtown, Pennsylvania, 18940
L. Chen
Affiliation:
Solarex Corporation, Thin Film Division, 826 Newtown-Yardley Road, Newtown, Pennsylvania, 18940
F. Jackson
Affiliation:
Solarex Corporation, Thin Film Division, 826 Newtown-Yardley Road, Newtown, Pennsylvania, 18940
K. Rajan
Affiliation:
Solarex Corporation, Thin Film Division, 826 Newtown-Yardley Road, Newtown, Pennsylvania, 18940
R.R. Arya
Affiliation:
Solarex Corporation, Thin Film Division, 826 Newtown-Yardley Road, Newtown, Pennsylvania, 18940
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Abstract

We report a study of a-Si:H/a-SiGe:H dual-bandgap p-i-n type tandem solar cells and Modules. Refined bandgap grading in the a-SiGe:H bottom cell results in higher Jsc (higher red response) without loss in FF or Voc. IMprovements in the tunnel junction consisting of doped widegap a-SiC:H and μC-Si lead to higher FF and lower optical loss. Undoped widegap a-SiC:H is used as interface layers in the top junction. Initial conversion efficiencies of 11.4% and 10.5% have been obtained for small-area cells and one-square-foot modules, respectively. The double junction cells and modules exhibit good stability and saturation of light-induced degradation, showing only ∼15% decrease in conversion efficiency after more than 1000 hours of simulated AM1.5 illumination. The stabilized efficiencies are 9.6% and 9.1%, respectively, for small area cell and large area Module. We also present some findings from the computer simulations of multijunction solar cell performance using a simple lump-circuit device Model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 336: Symposium A – Amorphous Silicon Technology - 1994 , 1994 , 723
Copyright
Copyright © Materials Research Society 1994

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References

REFERENCES

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