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Development of High Efficient Production Process of Materials for Solar Cells

太阳能电池材料高效生产工艺开发

基本信息

批准号：
10450279
负责人：
YAMAUCHI Chikabumi
金额：
$ 10.18万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450279/
关键词：
Silicon for Solar Cells Production Process Chemical Equilibration Technique Thermodynamic Data Vacuum melting Slag Distribution Ratio Gas Injection 太陽電池シリコン不純物除去活量活量係数相互作用係数標準生成自由エネルギー

项目摘要

In order to develop a new high efficient production process of silicon for solar cells by refining inexpensive metallurgical grade silicon, following experiments were conducted.1. The thermodynamic data (the activity coefficients, the interaction parameters and so on) related to impurities such as boron, aluminum, calcium, oxygen and nitrogen in molten silicon at 1723K and 1773K were measured by using the chemical equilibration techniques.2. Vacuum refining under the atmosphere of 10 Pa was applied for removing phosphorus, calcium and aluminum from molten silicon by using vacuum treatment was also examined from the thermodynamic viewpoint.3. Slag treatments were applied for removing boron and phosphorus from molten silicon.(1) The distribution ratios of boron and phosphorus between slags and molten silicon which are defined as :Lx ≡(mass% of X in slag)/[mass% of X in molten silicon], X = B or Pwere measured under an inert gas atmosphere at 1723 K and 1773 K and the following results were obtained :・ High value of distribution ratio of boron is not achieved even by using the NaOィイD20.5ィエD2-CaO-SiOィイD22ィエD2 slag saturated with SiOィイD22ィエD2, because high basically and high oxygen potential can not be simultaneously achieved in this process.・ High value of distribution ratio of phosphorus between the CaO-CaFィイD22ィエD2 slag saturated with CaO and molten silicon is achieved under the condition of lower oxygen potential.(2) The CaO-CaFィイD22ィエD2 slag addition-oxidizing gas injection method was applied for removing boron from molten silicon at 1773 K. Nearly 85 % of boron could be rapidly removed from molten silicon.

为了开发一种通过精炼廉价的冶金级硅来生产太阳能电池用硅的新工艺，进行了以下实验。利用化学平衡技术测定了1723K和1773K下硅液中硼、铝、钙、氧、氮等杂质的热力学数据(活度系数、相互作用参数等)。从热力学角度考察了在10Pa气氛下真空精炼对硅液中磷、钙、铝的脱除。(1)在1723K和1773K的惰性气体气氛下，测量了硼和磷在炉渣和硅液中的分配比Lx≡(炉渣中X的质量百分比)/[硅熔体中X的质量百分比]，X=B或P，得到以下结果：·即使使用NAOィイD20.5ィエD2-CaO-SiOィイD22ィエD2渣饱和了SiOィイD22ィエD2，也不能获得高的硼分配比，因为在这个过程中不可能同时达到高基本氧势和高氧势。在较低的氧势条件下，CaO-CaFィイD22ィエD2渣与硅液之间的磷分配比较高。(2)在1773K下，采用CaO-CaFィイD22ィエD2渣添加-氧化气体注入法脱除硅液中的硼，可快速脱除硅液中近85%的硼。