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

为了提高多晶硅太阳能电池的性能，减少切割浪费，对激光功率对硅（Si）的微结构控制条件进行了评价。虽然Si的熔合潜热很高，但在较长脉冲激光照射下，Si颗粒在几秒内溶解凝固，得到十到几百微米大小的Si颗粒，Si的微观结构受非均相成核的影响。此外，由于凝固组织与受热区之间的热应力是导致膜型多晶硅产生裂纹的主要原因，因此优化温度分布、气氛以及Si颗粒和衬底的冷却控制是重要的。

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.