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Wladek Walukiewicz, Materials Sciences Division, Berkeley Lab.: Full Solar Spectrum Photovoltaic Materials Identified.  Quote: "... Maximum, theoretically predicted efficiencies increase to 50%, 56%, and 72% for stacks of 2, 3, and 36 junctions with appropriately optimized energy gaps, respectively...."

CNET: 5/12/03 SunPower Announces World's Most Efficient, Low-Cost Silicon Solar Cell Quote: "...The National Renewable Energy Laboratory (NREL) has verified 20.4 percent conversion efficiency for the A-300...."

SunPower A-300 (pdf) , SunPower

29 March 2002, Scientists Create New Solar Cell Quote: "...semiconducting plastic material known as P3HT... 1.7 percent for sunlight..."

15 February 03, 'Denim' solar panels to clothe future buildings Quote: "... Unlike conventional solar cells, the new, cheap material has no rigid silicon base..."

Residential Solar Power Systems - Photo Gallery