用连铸法生产低成本硅片——滴控法的发展

S. Goda, T. Moritani, Y. Hatanaka, H. Shimizu, I. Hide
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引用次数: 6

摘要

为了获得低成本的硅片,设计了连铸法(CCM)。该方法通过在熔硅区和注入区两侧分别设置预热区和晶体生长区和冷却区,达到降低晶圆成本的生产效果。我们开发了一种滴控法(DCM)作为CCM的铸造方法。在DCM中,硅液的注入与晶体生长同时进行,并主动利用硅液的热量作为热源来控制晶体生长。DCM是连铸中最有效的铸造方法。采用DCM生产批量型铸锭,尺寸为320平方毫米,高度为260-300毫米。整个钢锭的氧含量为5- 15ppma,碳含量小于5ppma。当晶圆尺寸为100 mm/spl倍/100 mm时,采用我们的标准晶圆工艺,在生长方向上,电池效率产率超过13.5%,为80%。JQA测量的最大值为14.3%。本研究测量的太阳能电池效率、载流子寿命和扩散长度表明,DCM具有获得单向生长和柱状结构的优势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Production of low cost silicon wafers by continuous casting method-development of drip-controlled method
The continuous casting method (CCM) has been designed to obtain low cost silicon wafers. This method has the objective of wafer cost reduction production effect through the installation of a pre-heating zone and a crystal growth and cooling zone separately on both sides of a silicon melting and injecting zone. We have developed the drip-controlled method (DCM) as a casting method for CCM. In DCM, the injection of molten silicon and the crystal growth are carried out simultaneously and the heat of molten silicon is utilized actively as a heat source to control the crystal growth. DCM is the most effective casting method for continuous casting. Batch-type ingots with a size of 320 mm square, height 260-300 mm, were produced by DCM. An oxygen content of 5-15 ppma and a carbon content of less than 5 ppma were obtained throughout the ingots. The cell efficiency yield of more than 13.5% was 80% against the growth direction, with a wafer size of 100 mm/spl times/100 mm using our standard cell process. A maximum value was found of 14.3% measured in JQA. The solar cell efficiency, the carrier lifetime and the diffusion length measured in this study showed DCM had an advantage for obtaining one-directional growth and columnar structure.
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