17_Michael Lu High Efficiency Solar Cells

17_Michael Lu High Efficiency Solar Cells -...

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Michael Lu, ECE 3080 Dr. Alan Doolittle
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What makes a High Efficiency Solar Cell? Solar cells often measured through their energy conversion efficiency, η Efficiency related to power and light irradiance: Maximum theoretical conversion efficiency: 86.8% High efficiency solar cells typically greater than 25% efficiency that can be found in the highest quality commercial solar cells in OC SC C M P FF V I A E P
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Cell Efficiency Overview
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Key Solar Cell Energy Transfers: Where Does All the Energy Go? 1) Photons transmitted through solar cell and not absorbed 2) Solar energy losses resulting from conversion to heat contact voltage losses 5) EHP recombination losses
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Why Use Multi Junction Solar Cells? Each layer tuned to a different wavelength, shortest on top to longest on bottom. Tunnel junction to allow electrons toflow between cells Greater likelihood of energy capture Efficiency record: University of Delaware (42.8% Conversion), ‘07
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Single Junction v. Multi Junction Single junction efficiency losses due to non absorption Multi junction capability to absorb a larger spectrum of energy values Multi junction solar cells preferred
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Single Junction v. Multi Junction
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High Efficiency Multi Junction Cell Features and Characteristics III V Semiconductors most popular
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17_Michael Lu High Efficiency Solar Cells -...

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