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Heterojunction solar cells on flexible silicon wafers

Published online by Cambridge University Press:  11 January 2016

André Augusto ,
Pradeep Balaji ,
Harsh Jain ,
Stanislau Y. Herasimenka  and
Stuart G. Bowden
André Augusto*
Affiliation:
Arizona State University, Electrical Engineering, P.O. Box 875706, Tempe, AZ 85287-5706, U.S.A.
Pradeep Balaji
Affiliation:
Arizona State University, Electrical Engineering, P.O. Box 875706, Tempe, AZ 85287-5706, U.S.A.
Harsh Jain
Affiliation:
Arizona State University, Electrical Engineering, P.O. Box 875706, Tempe, AZ 85287-5706, U.S.A.
Stanislau Y. Herasimenka
Affiliation:
Arizona State University, Electrical Engineering, P.O. Box 875706, Tempe, AZ 85287-5706, U.S.A.
Stuart G. Bowden
Affiliation:
Arizona State University, Electrical Engineering, P.O. Box 875706, Tempe, AZ 85287-5706, U.S.A.
*
*(Email: augusto@asu.edu)
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Abstract

Current large-scale production of flexible solar devices delivers cells with low efficiency. In this paper we present an alternative path to organic or inorganic thin films. Our cells combine the remarkable surface passivation properties of the silicon heterojunction solar cells design, and the quality of n-type Cz wafers. The cells were manufactured on 50-70 µm-thick wafers. The cells have and efficiency of 17.8-19.2%, open-circuit voltages of 735-742 mV, short-circuit currents of 34.5-35.5 mA/cm2, and fill-factors of 72-75%. The cells are not as flexible as bare wafers. Thin cells are particular sensitive to the additional stress introduced by the busbars and the soldered ribbons. For radiuses of curvature over 8cm the cells efficiency remains the same, for radius equal to 6cm the cell efficiency drops less than 2%, and for radius equal to 4cm the drop is less than 3%. The broken fingers due to smaller bend radius lead to higher series resistance and subsequently lower field-factors.

Keywords

Siphotovoltaiccrystalline
Type
Articles
Information
MRS Advances , Volume 1 , Issue 15: Energy and Sustainability , 2016 , pp. 997 - 1002
Copyright
Copyright © Materials Research Society 2016 

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References

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