Solar Cells and Integration of Nanotechnology Organic/Inorganic solar cells Silicon solar cells are most common and efficient right now. Reflection of.

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Presentation transcript:

Solar Cells and Integration of Nanotechnology Organic/Inorganic solar cells Silicon solar cells are most common and efficient right now. Reflection of incoming light is a big natural limitation for efficiency. Konarka Evergreen Solar, Inc. Marlboro, MA

Top side metallization grid Sunlight 0.5 µm n + emitter Average phosphorus~10 18 cm -3 ~ µmBoron~10 16 cm -3 p base Optional p + back surface diffusion Back side metallization Typical P-N Junction Silicon Solar Cell Structure REFLECTION! Anti-reflection coating

Pattern Transfer by Etching (Tunable Anti- Reflective Coating) J. Vac. Sci. Technol. B 20.6., Nov. Dec 2002 UMASS Can work as an anti- reflective coating!

Single Cell V out ~0.5 Volts Cut cells connected in series V out ~3 Volts Single Cell vs. Cut Cells

Electrical Measurements Maximum power rectangle V oc V max I max I sc Dist.IVI.V