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CdS and CdTe thin films for solar cells

CdS and CdTe thin films for solar cells. Rashad Hajimammadov Baku State University, department of Physics hajimammadov@hotmail.com. Energy sources. 1) Unrenewable energy sources : Petroleum, gas, coal 2) Renewable energy sources :

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CdS and CdTe thin films for solar cells

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  1. CdS and CdTe thin films for solar cells Rashad Hajimammadov Baku State University, department of Physics hajimammadov@hotmail.com

  2. Energy sources • 1) Unrenewable energy sources : • Petroleum, gas, coal • 2) Renewable energy sources : • Solar energy, wind energy, hydro- energy and etc. • 3) Nuclear energy with its advantage and disadvantages

  3. Using the sun to generate electricity • An increasingly popular use of solar energy involves solar electric systems, called photovoltaics • Photovoltaic (PV) systems convert sunlight directly into electricity, and are potentially one of the most useful of the renewable energy technologies.

  4. What is solar cell ? • A structure that converts solar energy directly to DC electric energy. • It supplies a voltage and a current to a resistive load (light, battery, motor). • It is like a battery because it supplies DC power. • It is not like a battery because the voltage supplied by the cell changes with changes in the resistance of the load.

  5. Groups of solar cells can be packaged into modules, panels and arrays to provide useful output voltages and currents to provide a specific power output.

  6. House coated with solar panels

  7. Using solar energy in satellite

  8. Solar arrays in a field

  9. Mobile solar module

  10. Cost of solar cells and its efficiency • The current best deals on solar cells is about 2.5 - $4.30 per watt. For a 50 watt solar panel, your total cost will be about $215 • GaAs and related compounds(A3B5) multilayer structure – 40 % • CIGS ~20 % • CdTe based solar cells – 16.5 % • Mono Si – 15 - 16 % • Amorphous Si – 12 % • polymer composite solar cells ~ 3 – 5 %

  11. The aim of my research • Deposition of CdS and CdTe thin films • Choosing a perfect deposition method for improving cell characterization

  12. CdS thin films Deposition technique

  13. Chemical components used in this method

  14. AFM image of CdS film

  15. CdTe thin films Deposition technique

  16. SEM image of CdTe film

  17. Conventional polycrystalline CdTe-based thin film solar cell

  18. Solar cell characterization • Voc=773mV, Jsc=23.92mA/cm2, fill factor FF =68.7%, a total area conversion efficiency of 12.71%

  19. Conclusion • CdS and CdTe thin films were deposited. • The prepared solar cells exhibited 12.7 % efficiency.

  20. Some questions • Are PV systems as efficient or economic as fossil-fueled systems? • Is PV a viable alternative for all of our power needs? For homes? For vehicles? For other needs? • Is PV the answer to all of the world’s power needs?

  21. Publications 1. Naser M. Fathi, Rashad H. Hajimammadov, Ulvi R. Hasanov, Ayaz I. Bayramov “Problems of Use of Alternative Energy Sources In Turkmenistan, February 24,25 2010” 2. R. Hajimammadov, N.Fathi, M.Sadigov, E. Mirzoyev, A. Bayramov, G. Khrypunov, N. Klochko “17th International Conference on Ternary and Multinary Compounds, 27-30 September 2010, Baku” 3. R. Hajimammadov, N.Fathi, M.Sadigov, E. Mirzoyev, A. Bayramov, G. Khrypunov, N. Klochko “ Azerbaijan Journal of Physics” december 2010. 4. R. Hajimammadov, R. Mehdiyev. “ Conference on Physics and Astronomy” Baku, 20th May 2011 5. R. Hajimammadov, N.Fathi, M.Sadigov, E. Mirzoyev, A. Bayramov, G. Khrypunov, N. Klochko, Tatyana Li “Effect of CdCl2 treatment on CdTe based solar cells prepared by close space sublimation and physical vapor deposition method ” Japan Journal of Physics, to be published

  22. Thanks for attention

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