Your SlideShare is downloading. ×
Yogesh Solar Cells
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Yogesh Solar Cells

1,821

Published on

Published in: Technology, Business
0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
1,821
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
169
Comments
0
Likes
2
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

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

×