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Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
Yogesh Solar Cells
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Yogesh Solar Cells

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Transcript

  • 1. Solar cells Yogesh Wakchaure
  • 2. Overview
    • Solar cell fundamentals
    • Novel solar cell structures
    • Thin film solar cells
    • Next generation solar cell
  • 3. Appealing Characteristics
    • Consumes no fuel
    • No pollution
    • Wide power-handling capabilities
    • High power-to-weight ratio
  • 4. Solar Energy Spectrum
    • Power reaching earth 1.37 KW/m 2
  • 5. Air Mass
    • Amount of air mass through which light pass
    • Atmosphere can cut solar energy reaching earth by 50% and more
  • 6. Solar cell – Working Principle
    • Operating diode in fourth quadrant generates power
  • 7. Overview
    • Solar cell fundamentals
    • Novel solar cell structures
    • Thin film solar cells
    • Next generation solar cell
  • 8. Back Surface Fields
    • Most carriers are generated in thicker p region
    • Electrons are repelled by p-p + junction field
  • 9. Schottky Barrier Cell
    • Principle similar to p-n junction cell
    • Cheap and easy alternative to traditional cell
    • Limitations:
    • Conducting grid on top of metal layer
    • Surface damage due to high temperature in grid-attachment technique
  • 10. Grooved Junction Cell
    • Higher p-n junction area
    • High efficiency ( > 20%)
  • 11. Overview
    • Solar cell fundamentals
    • Novel solar cell structures
    • Thin film solar cells
    • Next generation solar cell
  • 12. Thin Film Solar Cells
    • Produced from cheaper polycrystalline materials and glass
    • High optical absorption coefficients
    • Bandgap suited to solar spectrum
  • 13. CdTe/CdS Solar Cell
    • CdTe : Bandgap 1.5 eV; Absorption coefficient 10 times that of Si
    • CdS : Bandgap 2.5 eV; Acts as window layer
    • Limitation :
    • Poor contact quality with p-CdTe (~ 0.1  cm 2 )
  • 14. Inverted Thin Film Cell
    • p-diamond (Bandgap 5.5 eV) as a window layer
    • n-CdTe layer as an absorption layer
  • 15. Efficiency Losses in Solar Cell
    • 1 = Thermalization loss
    • 2 and 3 = Junction and contact voltage loss
    • 4 = Recombination loss
  • 16. Overview
    • Solar cell fundamentals
    • Novel solar cell structures
    • Thin film solar cells
    • Next generation solar cell
  • 17. Tandem Cells
    • Current output matched for individual cells
    • Ideal efficiency for infinite stack is 86.8%
    • GaInP/GaAs/Ge tandem cells (efficiency 40%)
  • 18. Multiple E-H pairs
    • Many E-H pairs created by incident photon through impact ionization of hot carriers
    • Theoretical efficiency is 85.9%
  • 19. Multiband Cells
    • Intermediate band formed by impurity levels.
    • Process 3 also assisted by phonons
    • Limiting efficiency is 86.8%
  • 20. Multiple Quantum Well
    • Principle of operation similar to multiband cells
  • 21. Thermophotonic Cells
    • Heated semiconductor emits narrow bandwidth radiations
    • Diode with higher temperature has lower voltage
  • 22. Thermophotovoltaic Cell
    • Filter passes radiations of energy equal to bandgap of solar cell material
    • Emitter radiation matched with spectral sensitivity of cell
    • High Illumination Intensity ( ~ 10 kW/m 2 )
  • 23. Thermophotovoltaic Cells
    • Efficiency almost twice of ordinary photocell

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