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Safatul Islam Mentor: Roger Angel Steward Observatory Solar Lab

Increasing Light Absorption in Concentrating Photovoltaic System Through Use of Anti- Reflective Sol-gel Coated Ball Lens. Safatul Islam Mentor: Roger Angel Steward Observatory Solar Lab. Introduction. http:// www.nasa.gov. Concentrated Photovoltaics.

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Safatul Islam Mentor: Roger Angel Steward Observatory Solar Lab

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  1. Increasing Light Absorption in Concentrating Photovoltaic System Through Use of Anti- Reflective Sol-gel Coated Ball Lens Safatul Islam Mentor: Roger Angel Steward Observatory Solar Lab

  2. Introduction http://www.nasa.gov

  3. Concentrated Photovoltaics • Solar tracker system with paraboloidal mirrors concentrate onto focal point • 1000x suns • Light energy is transformed to electricity

  4. Power Conversion Unit • 800 W module • Ultimately sell for less than $1 per watt

  5. Power Conversion Unit

  6. Ball Lens

  7. Objectives • Need for Anti-Reflective coating • Sol-gel • Overcoming spherical geometry • How can a thin film of Sol-gel be successfully coated onto a spherical ball lens?

  8. Methods • Spin coating application • Set up of necessary equipment

  9. Humidity controlled glovebox environment

  10. PID Controller to control spin rate

  11. Syringe and filter for deposition

  12. Table top furnace to fire coating

  13. Variables Affecting Film Coating • Smoothness of ball surface • Polishing • Cleanliness of ball surface • Sonicating, organic solvents • Structural Support • Sol-gel filtration • Syringe Application • Spin Rate

  14. Transmission Testing

  15. Results • From qualitative tests, coating was uniform throughout most of the ball • Thinner at poles • Small area around the equator remained uncoated • Coating becomes thinner after firing • Few defects were noticeable • The coating functioned as desired

  16. Results

  17. Acknowledgements • Steward Observatory Solar Lab • Dr. Roger Angel • Dr. Thomas Stalcup • Blake Coughenour • Brian Wheelwright • Andrew Geary • UA/NASA Space Grant Program • Susan Brew

  18. Extra Slides

  19. Future Considerations • Eliminate some of the defects • Automated cleaning and depositing apparatus • Better support to hold and transfer ball lens • Other methods of coating • Vacuum sputtering

  20. PCU Results

  21. Sol-gel http://www.centexbel.be

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