Control of the solidification front surface in an industrial seeded directional solidification for quasi-single crystalline silicon ingots

摘要

In order to reduce the small-grain region at the periphery of the solidified ingot to improve the average efficiency of the solar cells made by the wafers,a moving insulation partition block was designed in an industrial seeded directional solidification furnace for quasi-single crystalline silicon ingots.We proposed a few moving processes of the partition block.A transient global model of heat transfer in which all kinds of heat transfer are included was established to investigate the thermal field,the solidification front surface evolution and the energy consumption for each moving process of the insulation partition block.It was found that the moving process can significantly influence the thermal field,the solidification front shape and energy consumption in the solidification process.The moving insulation partition block design is feasible for reducing the small-grain region in the solidified ingots.