LONDON Ė European research institute IMEC has presented large-area silicon cells with a conversion efficiency of 19.4 percent.
European Photovoltaic Solar Energy Conference (Valencia, Spain), imec
unveiled two types of cells. With screen printed silver contacts
efficiencies of up to 19.1 percent were achieved whereas 19.4 percent
was achieved with copper-plated contacts.
were obtained due to a combination of factors including improved texture
and optimized firing conditions. The results were achieved on
large-area cells (148 square centimeters) with 170-micron thickness,
proving the industrial viability of the process.
The silicon solar cells feature rear-side passivation, laser ablation
and, local aluminum back-side field and screenprinted contacts or
Cu-plated contacts on advanced emitter schemes.
"The fact that
such efficiencies can be obtained by metallization schemes based on
screen printed silver contacts enables compatibility with present
industrial metallization practice in the solar cell industry. The
copper-based front-side metallization is a step towards higher
sustainability and lower cost, substituting Ag with Cu in future
industrial production of crystalline silicon solar cells," said Joachim
John, team manager for industrial solar cells at IMEC (Leuven,
IMEC is targeting cells with greater than 20 percent efficiency on 40-micron thick silicon.
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