Lecture7B_Giovanni_FlamandCPV

Lecture7B_Giovanni_FlamandCPV - 1 © Giovanni Flamand –...

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Unformatted text preview: 1 © Giovanni Flamand – IMEC 2009 High-efficiency multijunction solar cells for Concentrator PV applications Giovanni Flamand IMEC Workshop on Sustainable Energies Technical University, Lyngby, Denmark January 14-15 2009 3 © Giovanni Flamand – IMEC 2009 Contents • High-efficiency multijunction solar cells • CPV system • Commercial status and challenges 4 © Giovanni Flamand – IMEC 2009 Contents • High-efficiency multijunction solar cells • CPV system • Commercial status and challenges 5 © Giovanni Flamand – IMEC 2009 Multijunction solar cell basics • Fundamental solar cell efficiency limits E g E<E g X E=E g E E g – Incomplete absorption E>E g – Thermalization 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 Wavelength (nm) Intensity (mW/cm2 nm) AM1.5 spectrum • Single-junction cell efficiency is limited to ≈ 30% 6 © Giovanni Flamand – IMEC 2009 Multijunction solar cell basics • Multijunction cells: combine different cells (different E g ) to minimize absorption and thermalization losses Cell 1 Cell 2 Cell 3 E E g2 E g3 E g1 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 Wavelength (nm) Intensity (mW/cm2 nm) AM1.5 spectrum 7 © Giovanni Flamand – IMEC 2009 Multijunction solar cell basics • Practical implementation? • Spectral splitting • Mechanical stack • Monolithic stack 8 © Giovanni Flamand – IMEC 2009 Multijunction solar cell basics • Practical implementation? • Spectral splitting • Mechanical stack • Monolithic stack Cell 3 Cell 2 Cell 1 Main challenges: - bulky- mechanical architecture- electrical architecture- limited by optical system 9 © Giovanni Flamand – IMEC 2009 Multijunction solar cell basics • Practical implementation? • Spectral splitting • Mechanical stack • Monolithic stack Cell 3 Cell 2 Cell 1 Main challenges: - electrical architecture- optical coupling- interconnect/stacking complexity- heat dissipation 10 © Giovanni Flamand – IMEC 2009 Multijunction solar cell basics • Practical implementation?...
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This note was uploaded on 08/23/2011 for the course ECE 4833 taught by Professor Doolittle during the Spring '10 term at Georgia Tech.

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Lecture7B_Giovanni_FlamandCPV - 1 © Giovanni Flamand –...

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