论文名称：Microstructure and conversion efficiency of multicrystalline silicon ingot prepared by upgraded metallurgical grade silicon
论文类型：期刊论文
发表刊物：SOLAR ENERGY MATERIALS AND SOLAR CELLS
收录刊物：SCIE
卷号：186
页面范围：50-56
ISSN号：0927-0248
关键字：HPMC-Si; UMG-Si; Seed-assisted; Segregation behavior; Conversion efficiency
摘要：High-performance multicrystalline silicon (HPMC-Si) wafers were produced using upgraded metallurgical-grade silicon (UMG-Si) materials in the seed-assisted growth system at the industrial scale. The HPMC-Si wafers yielded low dislocation density and fine and uniform grain size. We observed that fine grain size suppressed the segregation effect of metal impurities. The effective segregation coefficients of Fe, Al, and total metal impurities approximated 0.265, 0.492, and 0.386, respectively. The concentration of impurities within 10-90% of the solidified fraction in the ingot was relatively uniform based on the improved crystal structure control. The heterogeneous nucleation mechanism of concave and planocera nucleation was discussed intensively. HPMC-Si wafers were obtained under the crystal structure control coupled with behavior regulation of impurity segregation in the seed-assisted growth system. The average conversion efficiency of Al-BSF processed solar cells reached 18.65%.
发表时间：2018-11-01