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低温退火磷吸杂工艺对低少子寿命铸造多晶硅电性能的影响
Effects of low-temperature annealing phosphorous gettering process on the electrical properties of multi-crystalline silicon with a low minority carrier lifetime
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摘要: 本文针对低少子寿命铸造多晶硅片进行试验,通过一种将多温度梯度磷扩散吸杂工艺与低温退火工艺结合的新型低温退火吸杂工艺,去除低少子寿命多晶硅片中影响其电性能的Fe杂质及部分晶体缺陷,提高低少子寿命多晶硅所生产的太阳电池各项电性能.通过低温退火磷扩散吸杂工艺与其他磷扩散吸杂工艺的比较,证明了低温退火吸杂工艺具有更好的磷吸杂和修复晶体缺陷的作用. IV-measurement发现经过低温退火工艺处理后的低少子寿命多晶硅,制备的太阳电池光电转换效率比其他实验组高0.2%,表明该工艺能有效地提高低少子寿命多晶硅太阳电池各项电性能参数及电池质量.本研究结果表明新型低温退火磷吸杂工艺可将低少子寿命硅片应用于大规模太阳电池生产中,提高铸造多晶硅材料在太阳能领域的利用率,节约铸造多晶硅的生产成本.Abstract: @@@@A new low-temperature annealing phosphorous gettering process (LTAPGP) was developed to improve the electrical properties of multi-crystalline silicon which has a low minority carrier lifetime. LTAPGP combined a multi-plateau temperature phosphorous gettering process and a low-temperature annealing process. LTAPGP can remove the iron impurities and crystallographic defects of multi-crystalline silicon, and improve the electrical properties of silicon solar cells that were produced from low minority carrier lifetime silicon wafers. Compared with multi-plateau and two-plateau temperature phosphorous gettering process, LTAPGP was more effective in gettering iron impurities and repairing crystallographic defects. The multi-crystalline silicon wafers with a low minority carrier lifetime went through an LTAPGP process were utilized to produce solar cells. The IV-measurement data prove that the efficiency of the new solar cells is 0.2% higher than that of specimens subject to the multi-plateau and two-plateau temperature processes. The results indicat that LTAPGP can make the low minority carrier lifetime silicon wafers to be used in solar cell industry, improve the utilization ratio and reduce the production cost of cast polysilicon.
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