From Tech-On:

Fraunhofer Institute for Solar Energy Systems (ISE) of Germany achieved an energy conversion efficiency of 23.4% with a single-crystal silicon solar cell made by forming a thin p-type semiconductor layer on an n-type semiconductor substrate.

Its cell area is 2 x 2cm. Fraunhofer ISE said that it is possible to mass-produce the solar cell, which is one of the most efficient crystalline silicon solar cells and could rival Sanyo and other companies' products.

Crystalline silicon solar cells based on n-type semiconductor substrates have a higher resistance to impurities than those based on p-type semiconductor substrates. Therefore, it is theoretically easier to enhance the energy conversion efficiency of the former solar cells.

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