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Interdigitated Back-Contacted Silicon Heterojunction Solar Cells With Improved Fill Factor and Efficiency

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8 Author(s)
Haschke, J. ; Inst. for Silicon Photovoltaics, Helmholtz-Zentrum Berlin, Berlin, Germany ; Mingirulli, N. ; Gogolin, R. ; Ferré, R.
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We compare recently reported results of efficient back-contacted amorphous/crystalline silicon heterojunction solar cells with fill factors up to 78.8% with calculated j-V characteristics that are derived from an area-weighted summation of recombination currents taken from lifetime measurements. We compare solar cell structures with and without an intrinsic buffer layer beneath the p-type amorphous silicon emitter. We find that the inclusion of the buffer layer reduces the fill-factor potential by changing the ideality of the recombination current. However, analyzing the series resistance by illumination-dependent j-V-measurements, we find that the major loss mechanism of the fill factor is the limitation of the charge-carrier transport.

Published in:

Photovoltaics, IEEE Journal of  (Volume:1 ,  Issue: 2 )

Date of Publication:

Oct. 2011

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