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Major Breakthrough in Polycrystalline Black Silicon Solar Cell

Recently, researchers from the Institute of Microelectronics of Chinese Academy of Sciences (CAS), or IMECAS, achieved a major breakthrough in the research on polycrystalline black silicon solar cell. Black silicon is a material with low reflectivity and, compared with common silicon, superior light-absorbing ability, making it suitable for solar cells.

The research team led by Xia Yang from the Microelectronics Equipment Laboratory of IMECAS produced black silicon with an innovative method of plasma immersion ion implantation technology. The self-developed plasma immersion ion implantation equipment (funded by NSFC and CAS) can produce black silicon with various micro structures and the average reflectivity of 0.5 % in the visible light, almost the same as that of black silicon made through femtosecond laser. Such technology can be used for mass production with lower cost and higher efficiency.The research result was published in journals like Solar Energy、Energy Procedia、Journal of Electron Spectroscopy and Related Phenomena and Acta Physica Sinica. Over 30 patent applications were submitted.

Through optimization of the black silicon structure and improvement on the battery assembly line(156mm×156mm polycrystalline), the average efficiency of polycrystalline black silicon solar cells massively produced on domestic production lines reached 17.46%, with the highest of 17.65%.

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