Photovoltaics: Past, Present, and Future
Photovoltaics: Past, Present, and Future
Photovoltaics: Past, Present, and Future
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S<strong>and</strong><br />
Energy <strong>and</strong> Si-intensive wafers<br />
Add Carbon &<br />
Heat Energy<br />
CO2<br />
Waste ~1/2<br />
in sawing<br />
metallurgical<br />
grade Si<br />
Add more heat<br />
energy (1500°C)<br />
pure<br />
SiHCl<br />
3<br />
or<br />
SiH4<br />
Add Heat Energy<br />
(1000 °C)<br />
silicon<br />
feedstock<br />
Use 10X<br />
more than<br />
needed • ~ 2 yr energy payback<br />
• $0.60/W - $1.00/W for feedstock alone
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