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Photovoltaics: Past, Present, and Future

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S<strong>and</strong><br />

HWCVD is<br />

best low-T<br />

scalable<br />

technique<br />

Vision for Si wafer replacement<br />

Add Carbon &<br />

Heat Energy<br />

CO2<br />

NREL Si Group: H. Branz, MRS 2009<br />

metallurgical<br />

grade Si<br />

44<br />

pure<br />

SiHCl3<br />

or<br />

SiH4<br />

Directly deposit<br />

enough pure silicon<br />

for light absorption

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