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Very Thin Micromorph Tandem Solar Cells Deposited at Low Substrate Temperature

Published online by Cambridge University Press:  18 May 2012

M.M. de Jong ,
J.K. Rath  and
R.E.I. Schropp
M.M. de Jong
Affiliation:
University Utrecht, Debye Institute for Nanomaterials Science, Nanophotonics-Physics of Devices, P.O. Box 80.000, 3508 TA Utrecht, The Netherlands
J.K. Rath*
Affiliation:
University Utrecht, Debye Institute for Nanomaterials Science, Nanophotonics-Physics of Devices, P.O. Box 80.000, 3508 TA Utrecht, The Netherlands
R.E.I. Schropp
Affiliation:
University Utrecht, Debye Institute for Nanomaterials Science, Nanophotonics-Physics of Devices, P.O. Box 80.000, 3508 TA Utrecht, The Netherlands
*
*Correspondence : J.K.Rath@uu.nl
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Abstract

As an alternative to crystalline silicon or thin film solar cells on rigid glass substrates, we aim to fabricate amorphous silicon (a-Si)/nanocrystalline silicon (nc-Si) tandem thin film solar cells on cheap flexible substrates. We have chosen polycarbonate as the superstrate and adapted the a-Si and nc-Si deposition processes for deposition at a maximum temperature of 130°. Because a-Si deposited at low temperatures has a high band gap, we were able to fabricate very thin (<1.2 μm) a-Si/nc-Si solar cells, because the high band gap of the a-Si shifts the current generation more towards the bottom cell, allowing for a much thinner (900 nm) bottom cell. The somewhat lower Jsc of the complete cell is partly compensated by a higher Vocwhich results in an initial conversion efficiency of 9.5% for the low temperature tandem solar cells on glass.

Keywords

plasma-enhanced CVD (PECVD) (chemical reaction)thin filmphotovoltaic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1426: Symposium A – Amorphous and Polycrystalline Thin-Film Silicon Science and Technology—2012 , 2012 , pp. 45 - 49
Copyright
Copyright © Materials Research Society 2012

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References

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