铸造多晶硅是新型低成本高效率的太阳能光电转换材料，随着晶体生长技术的成熟，氧杂质和高密度的位错成为其最主要的缺陷，制约着其光电转换效率。本项目研究铸造多晶硅中氧的沉淀、氧热施主和氧新施主的特性，研究氧和位错的相互作用规律，太阳能电池工艺中氧的沉淀行为以及氧对其光电转换效率的影响。

The fabrication of solar cells with high efficiency and low cost is the key to large scale application of solar energy. At present, cast multicrystalline silicon has replaced mono-crystalline silicon as the main photovoltaic materials, but the conversion efficiency of its solar cells is lower than that of mono-crystalline silicon. Oxygen and dislocations with high density are main defects in cast multicrystalline silicon and limit the conversion efficiency of the solar cells. On the base of international collaboration, The distribution of oxygen as well as the characters of thermal donors, new donors and oxygen precipitates in as-grown materials was researched in this project. The reaction between oxygen and dislocation and its effects on electrical properties were also investigated. In this project the behavior of oxygen precipitation during simulated process of the fabrication of solar cells was also found. In addition, we investigated the texturizattion and its mechanism of cast multicrystalline silicon. The research results are beneficial for industry to fabricate solar cells with high efficiency.