Increasing Light Absorption in Concentrating Photovoltaic System Through Use of Anti- Reflective...
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![Page 1: Increasing Light Absorption in Concentrating Photovoltaic System Through Use of Anti- Reflective Sol-gel Coated Ball Lens Safatul Islam Mentor: Roger Angel.](https://reader036.fdocuments.us/reader036/viewer/2022062619/55164d2a550346b2068b5764/html5/thumbnails/1.jpg)
Increasing Light Absorption in Concentrating Photovoltaic System Through Use of Anti-
Reflective Sol-gel Coated Ball Lens
Safatul IslamMentor: Roger Angel
Steward Observatory Solar Lab
![Page 2: Increasing Light Absorption in Concentrating Photovoltaic System Through Use of Anti- Reflective Sol-gel Coated Ball Lens Safatul Islam Mentor: Roger Angel.](https://reader036.fdocuments.us/reader036/viewer/2022062619/55164d2a550346b2068b5764/html5/thumbnails/2.jpg)
Introduction
http://www.nasa.gov
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Concentrated Photovoltaics
• Solar tracker system with paraboloidal mirrors concentrate onto focal point– 1000x suns
• Light energy is transformed to electricity
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Power Conversion Unit
• 800 W module – Ultimately sell for less than $1 per watt
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Power Conversion Unit
![Page 6: Increasing Light Absorption in Concentrating Photovoltaic System Through Use of Anti- Reflective Sol-gel Coated Ball Lens Safatul Islam Mentor: Roger Angel.](https://reader036.fdocuments.us/reader036/viewer/2022062619/55164d2a550346b2068b5764/html5/thumbnails/6.jpg)
Ball Lens
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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?
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Methods
• Spin coating application• Set up of necessary equipment
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Humidity controlled glovebox environment
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PID Controller to control spin rate
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Syringe and filter for deposition
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Table top furnace to fire coating
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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
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Transmission Testing
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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
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Results
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Acknowledgements
• Steward Observatory Solar Lab– Dr. Roger Angel– Dr. Thomas Stalcup– Blake Coughenour– Brian Wheelwright– Andrew Geary
• UA/NASA Space Grant Program– Susan Brew
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EXTRA SLIDES
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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
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PCU Results
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Sol-gel
http://www.centexbel.be