9.Solar_cell

9.Solar_cell - Sp ec tral Ir ra di ance W m-2 nm-1 Etr...

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1 The ideal The ideal - - diode equation diode equation V a -x N -x dn x dp x P What is L e ? General solution BC's Sum the electron and hole currents:
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2 Bipolar conduction Bipolar conduction What is going on here?
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3 The solar cell The solar cell Sections 7.1, 3.1.2, 7.2, 7.3 of course text: 1. The Sun as a resource 2. Absorption 3. Photogeneration
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4 The Photovoltaic Effect The Photovoltaic Effect We need to consider: 1. Energy source 2. Absorption 3. Transport 4. Collection
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5 PV: large and small PV: large and small Photos of solar cell installations 12 MW Arnstein, Germany Tabernas desert, Spain 5kW Boston Massachusetts http://256.com/solar/
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6 The sun as a resource The sun as a resource • Value for H sun ? • How is the energy generated ? • Value for H 0 ? • How much is lost in the atmosphere ? • What is Air Mass ?
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7 Irradiance standards Irradiance standards ASTM G173-03 Reference Spectra 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 Wavelength nm
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Unformatted text preview: Sp ec tral Ir ra di ance W m-2 nm-1 Etr W*m-2*nm-1 Global tilt W*m-2*nm-1 Direct+circumsolar W*m-2*nm-1 What are the scatterers and absorbers? UDEL 8 Absorption Absorption TEM plane wave Refractive index What's this? What causes the attenuation? What's this? 9 Absorption coefficient Absorption coefficient Which of these materials has a direct bandgap? What is the cut-off energy? 10 Photogeneration Photogeneration What's happening here? 11 Unwanted generation Unwanted generation Free-carrier absorption Exciton formation 12 Internal quantum efficiency Internal quantum efficiency The rate of absorption Defining IQE What's this balance equation? Optical generation rate What's this, and what are its units? 13 The generation rate The generation rate Generation rate (m-3 s-1 ) How does this curve help in the design of the solar cell?...
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9.Solar_cell - Sp ec tral Ir ra di ance W m-2 nm-1 Etr...

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