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Title:
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Screen-printed ribbon growth on substrate solar cells exceeding 12% efficiency
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Author(s):
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Published by:
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Publication date:
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ECN
Solar Energy
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1-6-2005
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ECN report number:
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Document type:
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ECN-RX--05-019
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Conference Paper
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Number of pages:
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Full text:
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4
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Download PDF
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Presented at: 20th European Photovoltaic Solar Energy Conference and Exhibition, Barcelona, Spain, 6-10 juni 2005.
Abstract:
Ribbon Growth on Substrate (RGS) solar cells have been processed at
the University of Konstanz using an adapted industrial-type fire-through
SiN process. Efficiencies above 12% have been reached on 5x5 cm
2 cells processed from boron doped RGS material and efficiencies
of 11% from gallium doped RGS material. These are the highest efficiencies
obtained on this promising and cost-effective material using an industrial-type
cell process. An important factor for the increase in efficiency is
the reduced oxygen concentration of almost an order of magnitude in
the current RGS wafer material compared to former RGS material. Enhanced
Jsc, Voc, especially
in case of the gallium doped RGS material, and Leff values
in the range of 100 um as well as lifetimes above 4 us demonstrate the
potential of the new low oxygen RGS materials. No additional bulk passivation
steps have to be performed, a sufficient pasivation is guaranteed solely
by hydrogen originating from a hydrogen rich SiNx antireflective coating
1 mA/cm2 enabling efficiencies close to 13% using material of current
quality.
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