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.
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%.