Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...
Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...
Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...
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4/04<br />
©<br />
MIT-ML<br />
iSun – 2 Watts<br />
Solar Cells<br />
Media Lab’s Locust Position Beacon<br />
• 10-20% efficiency <strong>for</strong> commercial modules<br />
• Common polycrystalline Si modules are ~16-17% (mass produced,<br />
cheap process, a few 1$'s a Watt total)<br />
• Monocrystalline Si are a little closer to 20%.<br />
• IC grade Si and fab processes, ~24% is possible but expensive.<br />
• Stacked multi-junction cells, and cells using other materials and<br />
structures get over 30% but are very expensive or still in the lab<br />
– 10-100 mW/cm 2 in bright sun<br />
– 10-100 μW/cm 2 in an office<br />
An option if the light and area are there<br />
JAP<br />
Franhofer ISE Freiberg<br />
1 Watt under halogen<br />
20% eff.<br />
5
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