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

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Presentation transcript:

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

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

Cost of Solar Cells 3 ECEN2060

Types and Efficiencies of Some Solar Cells 4 ECEN2060

The Useable Solar Spectrum 5 ECEN2060

Two dimensional view 6 ECEN2060

Energy Level Diagram 7 ECEN2060

8

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

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

Start Lecture ECEN2060

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.

Solar Spectrum 13 ECEN2060

P-N Junctions 14 ECEN2060

15 ECEN2060

P-N Junction Diodes. 16 ECEN2060

17 ECEN2060

P-N Junction Diode 18 ECEN2060

P-N Junction Diode. 19 ECEN2060

Equivalent Circuits 20 ECEN2060

Inverted Diode Curve 21 ECEN2060

Example 22 ECEN2060 For A=100

Equivalent Circuit For Shading 23 ECEN2060

A more complete Equivalent Circuit 24 ECEN2060

Effect of 25 ECEN2060

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

Series Resistance Added in 27 ECEN2060

Equivalent Circuit 28 ECEN2060

Total Equivalent Circuit. 29 ECEN2060

Combinations to Get to Useful Size 30 ECEN2060

Examples 31 ECEN2060

Modules to Arrays 32 ECEN Voltages for cells add in series 2 Currents for each cell add in parallel

Currents add in Parallel 33 ECEN2060

Two by Three Arrays 34 ECEN2060

Output Power 35 ECEN2060

Maximum Power 36 ECEN2060

Examples Under Standard Test Conditions 37 ECEN2060

Effects of Changes in Temperature 38 ECEN2060

Shading 39 ECEN2060

Impact of Shading 40 ECEN2060

Effects of Shading 41 ECEN2060

42 ECEN2060

Bypass Diode Reduces Voltage Across Shaded Cell 43 ECEN2060