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Some observations and proposed RD on solar cell technology Sudhir Sabharwal

General statements Silicon the second most abundant element. Crucial electronic material with the development of semiconductor technology. Silicon technology is a measure of the intellectual and industrialization level of any country. . General statements Silicon photovoltaic cell is most popul

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Some observations and proposed RD on solar cell technology Sudhir Sabharwal

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    1. Some observations and proposed R&D on solar cell technology Sudhir Sabharwal

    2. General statements Silicon the second most abundant element. Crucial electronic material with the development of semiconductor technology. Silicon technology is a measure of the intellectual and industrialization level of any country.

    3. General statements Silicon photovoltaic cell is most popular-not because it is most efficient, but because it is inexpensive as a lot of silicon is produced for making micro-electronics chips. Many other semiconductor materials such as gallium arsenide, cadmium sulphide, cadmium telluride, and copper indium diselenide are also used in special-purpose high-efficiency cells, but are more expensive than silicon cells. Multi-junction solar cell is the latest development.

    4. Typical conversion efficiencies of solar cells ------------------------------------------------------------- Cells conversion efficiency (%) Highest commercial ------------------------------------------------------------- Multicrystalline Si 14-19 monocrystalline Si 24.7 22 Thin films CdTe 18 9-12 Thin films CuInGaSe 19.9 9-12 Multi-junction cells ~40

    5. Multijunction solar cells Multijunction cells perform at higher efficiencies than conventional single-junction silicon solar cells, because they convert more of the solar spectrum into energy by breaking it up into chunks. For example, the first layer of Spectrolab's record-breaking triple-junction cell is composed of GaInP, which converts short-wavelength portions of the spectrum, such as blue and UV. The second layer, made of GaAs, captures the middle part of the spectrum. The third germanium layer does a good job with IR light.

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