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Solar Awards Silicon Innovation Award Final DR 3/9/09 12:19 Page 21
SOLAR AWARDS
Silicon Genesis
thinning of wafers. Today silicon is the
major (approx 60%) cost component of
PolyMax: Kerf-Free Wafering solar cells. With SiGen’s layer transfer
Technology. process, the cost of producing solar cells
with high efficiencies will be dramatically
Silicon Genesis has successfully reduced, further stimulating an already
produced solar substrates for the PV exploding market. By eliminating sawing
industry using its ‘kerf-free’ wafering losses, the PolyMax equipment set can
process technology called ‘PolyMax’. In substantially reduce the amount of
addition to saving poly, the wafers are polysilicon used within the ingot to wafer
claimed to be significantly more resistant manufacturing steps and also eliminate
to breakage than conventional wafers some of the costly consumables in
using its proprietary equipment. today’s wafer manufacturing. The kerf-free
nature of the PolyMax system is claimed
There are two primary types of solar cells to halve the silicon feedstock material
- - thin film and thick film. The thin film required to manufacture the same amount
cells have excellent silicon utilisation, but of MW capacity per year.
suffer from poor conversion efficiency. utilising engineering equipment with
The thick films have typically high First targeted to process monocrystalline excellent mechanical and electrical
conversion efficiencies, but require silicon to produce high-efficiency silicon characteristics. First targeted to process
excessive amounts of precious silicon. solar cells, the equipment is expected to monocrystalline silicon to produce high-
SiGen’s layer transfer technology help the PV industry reach grid parity efficiency silicon solar cells, the
provides for thin films with good while simultaneously relaxing the equipment is expected to help the PV
21
efficiencies. SiGen’s layer transfer shortage of polysilicon feedstock. industry reach grid parity while
process is a ‘green’ process since there is The company has produced 50-micron simultaneously relaxing the shortage of
www
no sawing, grinding or other mechanical thick, full-size 125mm wafer samples polysilicon feedstock.
.solar
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Issue IV 2009
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