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Understanding Solar Energy: Basics, Technology, and Efficiency Factors

This presentation explores the fundamentals of solar energy, including how solar cells work and the various types of solar cells available today. This includes an overview of the solar constant, recent measurements, and the impact of Earth's distance from the sun on solar energy variation. The roles of back surface field (BSF) layers and back surface reflectors (BSR) in improving solar cell efficiency are discussed, highlighting the advancements in multi-junction solar cells and their exceptional efficiency rates. Join us to discover the evolution of solar technology since the launch of Vanguard 1 in 1958.

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Understanding Solar Energy: Basics, Technology, and Efficiency Factors

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  1. Initial System Design Presentation I Power systems

  2. Presentation topics • Solar energy • How solar cells work • Different types of solar cells available

  3. Solar Energy

  4. Solar Constant : Integrated energy under the Air mass Zero ( outside the Earth’s atmosphere ) curve. Accepted value till 1990s = 135.3 mW/cm^2 Recent measurements shows it is 136.6 mW/cm^2 The difference in Earth-sun distance between perihelion and aphelion results in solar constant variation of +- 3.5% of 136.6 mW/cm^2

  5. When a solar cell gets illuminated , electron – hole pairs are produced throughout the base region below the junction to a depth that is dependent on light’s wavelength. Longer wavelengths have more penetrating power. Back Surface field ( BSF) layer is introduced to reflect back minority carriers that are diffusing away from the junction. Back Surface Reflector (BSR) layer is there to reflect protons. BSFR cells are better.

  6. Such cells have reached efficiencies of around 35% under concentrated sunlight. Multijunction cells

  7. The first spacecraft to use solar panels was the Vanguard 1 satellite, launched by the US in 1958. This was largely because of the influence of Dr.Hans Ziegler, who can be regarded as the father of spacecraft solar power.

  8. http://s1.zetaboards.com/UTD_Cube_Satellite

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