人工晶体学报2025，Vol.54Issue(8)：1454-1462,9.DOI:10.16553/j.cnki.issn1000-985x.2025.0033
三段式冷却工艺对Al-30%Si合金法提纯太阳能级多晶硅的影响
Effect of Three-Stage Cooling Process on the Purification of Solar-Grade Polysilicon by Solvent Refining in Al-30%Si Alloy
摘要
Abstract
During solvent refining for solar-grade polysilicon,the cooling process significantly influences the nucleation,crystal growth and impurity segregation of primary silicon.This study investigated the cooling process of Al-30%Si alloy over a temperature range of 900℃to 600℃and compared the effects of single-rate cooling and three-stage cooling processes on the morphology and impurity content of primary silicon.The main objective is to optimize the solvent refining process.The results indicate that,under the single-rate cooling process,a cooling rate of 1℃/min can significantly increase the primary silicon grain size,reduce the impurity content in the primary silicon,and improve the impurity removal rate.In contrast,under the three-stage cooling process,a nodal temperature close to the high-temperature region results in a larger grain size and improves the purity and yield of primary silicon.The best purification effect can be achieved when the nodal temperature is set at 700℃.In this case,the grain size of primary silicon is slightly lower,while the impurity content is comparable to that before optimization.At the same time,the optimized process achieves a 62.3%reduction in cooling duration and a 23.3%decrease in energy consumption.This study provides a potential strategy to fabricate solar-grade polysilicon using Al-Si solvent refining,which is of significant experiment accumulation.关键词
太阳能级多晶硅/Al-Si合金法/冷却速率/节点温度/工艺优化Key words
solar grade polysilicon/solvent refining in Al-Si alloy/cooling rate/nodal temperature/process optimization分类
数理科学引用本文复制引用
唐洪,狄嘉慧,杨平平,李少猛,施玉洁,何占伟,赵紫薇,高忙忙..三段式冷却工艺对Al-30%Si合金法提纯太阳能级多晶硅的影响[J].人工晶体学报,2025,54(8):1454-1462,9.基金项目
国家自然科学基金(52164047) （52164047）
中国科学院"西部之光"人才培养计划(XAB2022YW10) （XAB2022YW10）
宁夏回族自治区重点研发项目(2022CXLHT001) （2022CXLHT001）
