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By Martin A. Green

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Extra info for Crystalline silicon solar cells

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L. (1975), ‘Recent advancements in low cost solar cell processing’, Conf. Record 11th. , Scottsdale, IEEE Press, Piscataway, 315–316. Riordan M. and Hoddeson L. (1997), Crystal Fire: The Birth of the Information Age, Norton, New York. , Khattak C. , Emery K. and Field H. J. 6% efficient solar cell on HEM multicrystalline material’, Conf. Record 25th. , IEEE Press, Piscataway, 741–744. , Abe M. and Kato Y. (1997), ‘Purification of metallic grade silicon up to solar grade by NEDO melt purification process’, Proc.

The early work laboured under what is now known to be a misconception that quite thick layers (>20 µm) of silicon would be required to give reasonable performance due to silicon’s poor absorption characteristics arising from its indirect band gap (see Fig. 8). However, since light trapping can increase the effective optical thickness of a silicon cell by 10–50 times, this means that layers of only 1 µm or so thickness are still inherently capable of producing similar performance to much thicker layers.

And Swanson R. M. (1997), ‘Backside-contact silicon solar cells with improved efficiency for the ’96 world solar challenge’, Proc. 14th. , Barcelona, H. S. Stephens & Associates, Bedford, 96–99. Wallace R. , Hanoka J. , Kamra S. and Rohatgi A. (1997), ‘Thin silicon string ribbon for high efficiency polycrystalline solar cells’, Conf. Record 26th. , Anaheim, Piscataway, 99–102. Weber K. , Stocks M. and Blakers A. W. (1997), ‘Lift-off of silicon epitaxial layers for solar cell applications’, Conf.

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