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

2. Solar Spectrum 2 ECEN2060 Power Spectrum Planck’s LawTotal energy Radiated Stefan-Boltzmann Law Suns Spectrum for T= 5800

3. Cost of Solar Cells 3 ECEN2060

4. Types and Efficiencies of Some Solar Cells 4 ECEN2060

5. The Useable Solar Spectrum 5 ECEN2060

6. Two dimensional view 6 ECEN2060

7. Energy Level Diagram 7 ECEN2060

8. 8

9. Photon Activation 9 ECEN2060 Requirement for creating an electron hole Pair is hν> Eg

10. Holes or the Absence of an Electron in the Conduction Band 10 ECEN2060

11. Start Lecture 22 11 ECEN2060

12. Cut-off Wavelengths 12 ECEN2060 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.

13. Solar Spectrum 13 ECEN2060

14. P-N Junctions 14 ECEN2060

15. 15 ECEN2060

16. P-N Junction Diodes. 16 ECEN2060

17. 17 ECEN2060

18. P-N Junction Diode 18 ECEN2060

19. P-N Junction Diode. 19 ECEN2060

20. Equivalent Circuits 20 ECEN2060

21. Inverted Diode Curve 21 ECEN2060

22. Example 22 ECEN2060 For A=100

23. Equivalent Circuit For Shading 23 ECEN2060

24. A more complete Equivalent Circuit 24 ECEN2060

25. Effect of 25 ECEN2060

26. Series Resistance 26 ECEN2060 Contact resistance, resistance in diode outside of the junction region

27. Series Resistance Added in 27 ECEN2060

28. Equivalent Circuit 28 ECEN2060

29. Total Equivalent Circuit. 29 ECEN2060

30. Combinations to Get to Useful Size 30 ECEN2060

31. Examples 31 ECEN2060

32. Modules to Arrays 32 ECEN2060 1 Voltages for cells add in series 2 Currents for each cell add in parallel

33. Currents add in Parallel 33 ECEN2060

34. Two by Three Arrays 34 ECEN2060

35. Output Power 35 ECEN2060

36. Maximum Power 36 ECEN2060

37. Examples Under Standard Test Conditions 37 ECEN2060

38. Effects of Changes in Temperature 38 ECEN2060

39. Shading 39 ECEN2060

40. Impact of Shading 40 ECEN2060

41. Effects of Shading 41 ECEN2060

42. 42 ECEN2060

43. Bypass Diode Reduces Voltage Across Shaded Cell 43 ECEN2060