太阳能电池中B作为受主杂质在硅基体中的含量不得超过0.3×10-6.造渣氧化精炼是有效的除硼方法之一,综述了CaO-SiO2基造渣剂除硼的研究进展.研究发现,向融硅中连续不断地加入60％ CaO-40％ SiO2造渣剂,原料硅中的B含量可从40×10-6降至1×10-6.硼分离系数(LB)在低碱度(0.55)到高碱度(1.21)呈明显抛物线形状.添加少量CaF2会增加渣的实际碱度比,但过量的CaF2则起到稀释渣的有效成分和降低渣熔点的作用.本实验室利用CaO-SiO2-CaF2体系进行造渣实验也获得很好的除硼效果.
参考文献
| [1] | European Photovoltaic Industry Association .Global Market Outlook for Photovoltaics until 2014[EB/OL].http://www.epia.org/publications/epia-publications.html,2010-05-15. |
| [2] | Morita K;Mikib T .Thermodynamic of solargrade silicon refining[J].Intermetallics,2003,11(12):1111. |
| [3] | NIIST-JANAF.Thermochemical tables[M].US:American Institute of Physics,1998:1885. |
| [4] | Khattak CP.;Joyce DB.;Schmid F. .A simple process to remove boron from metallurgical grade silicon[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2002(1/4):77-89. |
| [5] | Leandro A. V. Teixeira;Kazuki Morita .Thermodynamics of Boron Removal from Molten Silicon with CaO-SiO_2 Slag[J].材料とプロセス,2007(1):83-0. |
| [6] | Leandro Augusto Viana TEIXEIRA;Yomei TOKUDA;Toshinobu YOKO .Behavior and State of Boron in CaO-SiO_2 Slags during Refining of Solar Grade Silicon[J].ISIJ International,2009(6):777-782. |
| [7] | Du LS.;Stebbins JF. .Solid-state NMR study of metastable immiscibility in alkali borosilicate glasses[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2003(3):239-255. |
| [8] | Suzuki K;Sano N.Thermodynamic for removal of boron from metallergical silicon by flux treatmeat[A].Portugal,1991:273. |
| [9] | Anders Schei .Method for refining of silicon[P].US,5788945,1998-08-04. |
| [10] | Fujiwara H;Otsuka R;Wada K et al.Silicon purifying method,slag for purifying silicon and purified silicon[P].Japan,066523,2003-08-14. |
| [11] | Enebakk Erik Tranell;Tronstadet G M et al.Calcium-silicon based slag for treatment of molten silicin[P].US,20080156145,2008-03-07. |
| [12] | Dial J Michael .Process for purifying metallurgical-grade silicon[P].US,4304763,1981-12-08. |
| [13] | Noguchi R et al.Thermodynamics of boron in a silicon melt[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1994,25:903. |
| [14] | Sommerville I D;Kay D A R .Activity determinations in the CaF2-CaO-SiO2 system at 1450C[J].Metallurgical and Materials Transactions,1971,2:1727. |
| [15] | Leandro Augusto Viana TEIXEIRA;Kazuki MORITA .Removal of boron from molten silicon using CaO-SiO_2 based slags[J].ISIJ International,2009(6):783-787. |
| [16] | Morita K;Kume K;Sano N .Activity measurement of silicate slags equilibrated with molten silicon alloys[J].Scandinavian Journal of Metallurgy,2002,31:178. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%