Development of Thin Solar Battery Module Controlled at 211 Crystal Directions by Microscopic particle and Local Fusion Method

为了开发多晶硅太阳电池的特性和减少切割废料，对激光功率下硅的微观结构控制条件进行了评价。尽管硅的熔化潜热很高，但研究表明，在较长脉冲的激光照射下，硅颗粒在几秒钟内溶解凝固，得到了尺寸为十几到几百微米的硅颗粒，并且硅的微观组织受到异质形核的影响。研究表明，在薄膜多晶硅的生产过程中，由于凝固组织与加热区之间的热应力导致了裂纹的产生，因此，温度分布的优化、气氛的优化以及硅颗粒与衬底的冷却控制是非常重要的。

The microstructural control condition of silicon (Si) using a laser power was evaluated for the purpose of the development of characteristics and the reduction of the cutting waste for the multi-crystalline silicon solar battery. Though the latent heat of fusion of Si is extremely high, it was revealed that the Si particles are dissolved and solidified in a few seconds by irradiating the laser of a relatively long pulse, Si particle of ten to several hundred micrometers size is obtained, and the microstructure of Si is influenced by the heterogeneous nucleation. Furthermore, it is showed that the optimization of temperature distribution, the atmosphere and the cooling control of Si particle and the substrate are important, since the thermal stress between solidification structure and the heated area causes to initiate the clack at the production of film type multi-crystalline Si.