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Mitsubishi Electric Achieves World's Highest 18% Conversion Efficiency in Practical Size Polycrystal

Mitsubishi Electric Achieves World's Highest 18% Conversion Efficiency in Practical Size Polycrystalline Silicon Solar Cell

Jun 01, 2007 18:54
Hiroshi Idegawa, Nikkei Monozukuri


Mitsubishi Electric Corp. has announced its achievement of a photoelectric conversion efficiency rate of 18.0% in a 150 mm square practical use polycrystalline silicon solar cell. Assessment was conducted by a public verification agency the National Institute of Advanced Industrial Science and Technology (AIST). This achievement allows 7% more power generation per area, and therefore enables limited installation spaces such as a small roof to secure a sufficient amount of power generation.

Mitsubishi also plans to present this achievement at the "17th International Photovoltaic Science and Engineering Conference" to be held in Fukuoka in December 2007.
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This solar cell has incorporated three proprietary technologies in an effort to increase efficiency. Firstly, reflectivity from the acceptance surface has been reduced through RIE (reactive ion etching) microfabrication using a nano-sized mask material. This resulted in the increased amount of absorbed light. Secondly, the lowering of electrical performance in crystalline has been suppressed through a new electrode material. Thirdly, effective electrical output surface area has been expanded by thinning grid collector electrodes. Through these technologies, Mitsubishi achieved the world's highest conversion efficiency of 18%.
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