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October 11,2013

October 11,2013. ECEN 2060 Lecture 21 Fall 2013. Homework Problems Chapter 5 problems. Solar Spectrum. Power Spectrum Planck’s Law. Total energy Radiated Stefan-Boltzmann Law. Suns Spectrum for T= 5800. Cost of Solar Cells. Types and Efficiencies of Some Solar Cells.

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October 11,2013

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  1. October 11,2013 ECEN 2060 Lecture 21 Fall 2013 Homework Problems\ Chapter 5 problems

  2. Solar Spectrum Power Spectrum Planck’s Law Total energy Radiated Stefan-Boltzmann Law Suns Spectrum for T= 5800

  3. Cost of Solar Cells

  4. Types and Efficiencies of Some Solar Cells

  5. The Useable Solar Spectrum

  6. Two dimensional view

  7. Energy Level Diagram

  8. Photon Activation Requirement for creating an electron hole Pair is hν> Eg

  9. Holes or the Absence of an Electron in the Conduction Band

  10. Start Lecture 22

  11. Cut-off Wavelengths The issue is that you can not use the long wavelength solar energy and the short wavelengths lose the energy above the band-gap to heat.

  12. Solar Spectrum

  13. P-N Junctions

  14. P-N Junction Diodes.

  15. P-N Junction Diode

  16. P-N Junction Diode.

  17. Equivalent Circuits

  18. Inverted Diode Curve

  19. Example For A=100

  20. Equivalent Circuit For Shading

  21. A more complete Equivalent Circuit

  22. Effect of

  23. Series Resistance Contact resistance, resistance in diode outside of the junction region

  24. Series Resistance Added in

  25. Equivalent Circuit

  26. Total Equivalent Circuit.

  27. Combinations to Get to Useful Size

  28. Examples

  29. Modules to Arrays 1 Voltages for cells add in series 2 Currents for each cell add in parallel

  30. Currents add in Parallel

  31. Two by Three Arrays

  32. Output Power

  33. Maximum Power

  34. Examples Under Standard Test Conditions

  35. Effects of Changes in Temperature

  36. Shading

  37. Impact of Shading

  38. Effects of Shading

  39. Bypass Diode Reduces Voltage Across Shaded Cell

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