Abstract
Among currently known alternatives for renewable energy sources, solar power is generally regarded as having the most potential to satisfy the ever-growing demand. While solar photovoltaic power is a well-established technology, its widespread uptake has been hindered by the prohibitively high price of units and thus electricity. This is due mainly to the high cost of the silicon used to fabricate the devices. This article presents a review of the development of established pyrometallurgical techniques as applied to refining metallurgical silicon to solar grade for the purposes of reducing reliance on expensive traditional silicon feedstock. Four basic high-temperature methods—solvent refining, vaporization, electrorefining, and slag treatment—are described, and the limitations and advantages of each method are presented. It is apparent that these techniques are very useful for removing impurities from silicon, but are often selective and not able to remove all problematic elements. Therefore, refining may need to be as a sequence of steps, targeting specific elements each time, or as novel methods combining multiple techniques simultaneously. Ultimately, the successful approach will have to achieve large-scale production by cost-effective means to replace current methods.
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References
E. Despoto, A. El Gammal, B. Fontaine, D. Fraile Montoro, M. Latour, S. Lenoir, G. Masson, and P. Van Buggenhout, Global Market Outlook for Photovoltaics Until 2014 (Brussels: European Photovoltaic Industry Association, 2010).
K.P. Chandra and D.B. Joyce, Sol. Energy Mater. Sol. Cells 74, 77 (2002).
J.H. Aalberts and M.L. Verheijke, Appl. Phys. Lett. 1, 19 (1962).
M.K. Bakhadyrkhanov, B.I. Boltaks, and G.S. Kulikov, Soviet Physics Solid State 12, 144 (1970).
H. Feichtinger and R. Czaputa, Appl. Phys. Lett. 39, 706 (1981).
R.H. Hopkins, Effect of Impurities on Silicon Solar-cell Performance (Las Vegas, Nevada: JPL, 1986).
W. Lin and D.W. Hill, J. Appl. Phys. 54, 1082 (1983).
L. Ottem, Solubility and Thermochemical Data of Oxygen and Carbon in Liquid Alloys of Silicon and Ferrosilicon (Trondheim, Norway: SINTEF, 1993).
H. Sigmund, J. Electrochem. Soc. 129, 2809 (1982).
F.A. Trumbore, Bell Syst. Tech. J. 39, 205 (1960).
I. Obinata and N. Komatsu, Sci. Rep. RITU A-9, 118 (1957).
Ciftja, T.A. Engh, and M. Tangstad, Refining and Recycling of Silicon: A Review (Trondheim: NTNU, 2008).
P.S. Kotval, H.B. Strock, US Patent No. 4,124,410, 1978, Union Carbide Corporation.
P.S. Kotval, H.B. Strock, US Patent No. 4,193,974, 1980, Union Carbide Corporation.
P.S. Kotval, H.B. Strock, US Patent No. 4,193,975, 1980, Union Carbide Corporation.
P.S. Kotval, H.B. Strock, US Patent No. 4,195,067, 1980, Union Carbide Corporation.
J. Gumaste, B. Mohanty, R. Galgali, U. Syamaprasad, B. Nayak, S. Singh, and P. Jena, Sol. Energy Mater. 16, 289 (1987).
T. Miki, K. Morita, and N. Sano, Metall. Mater. Trans. B 27, 937 (1996).
T. Miki, K. Morita, and N. Sano, Metall. Mater. Trans. B 28, 861 (1997).
T. Miki, K. Morita, and N. Sano, Metall. Mater. Trans. B 29, 1043 (1998).
K. Morita and T. Miki, Intermetallics 11, 1111 (2003).
T. Yoshikawa and K. Morita, Sci. Technol. Adv. Mater. 4, 531 (2003).
T. Yoshikawa and K. Morita, J. Electrochem. Soc. 150, G465 (2003).
T. Yoshikawa, K. Arimura, and K. Morita, Metall. Mater. Trans. B 36B, 837 (2005).
T. Yoshikawa and K. Morita, Metall. Mater. Trans. B 36B, 731 (2005).
T. Yoshikawa and K. Morita, J. Phys. Chem. Solids 66, 261 (2005).
T. Yoshikawa, K. Morita, in EPD Congress (TMS, Warrendale, PA, 2005), pp. 549–558.
T. Yoshikawa and K. Morita, J. Cryst. Growth 311, 776 (2009).
T. Yoshikawa, K. Morita, S. Kawanishi, and T. Tanaka, J. Alloys Compd. 490, 31 (2010).
K. Morita and T. Yoshikawa, Trans. Nonferrous Metals Soc. China 21, 685 (2011).
B. Bathey and M.C. Cretella, J. Mater. Sci. 17, 3077 (1982).
T. Shimpo, T. Yoshikawa, and K. Morita, Metall. Mater. Trans. B 35B, 277 (2004).
Y.V. Meteleva-Fischer, Y. Yangb, R. Boom, B. Kraaijveld, and H. Kuntzel, Intermetallics 25, 9 (2012).
G. Inoue, T. Yoshikawa, and K. Morita, High Temp. Mater. Processes 22, 221 (2003).
J.M. Juneja and T.K. Mukherjee, Hydrometallurgy 16, 69 (1986).
A.M. Mitrašinović and T.A. Utigard, Silicon 1, 239 (2009).
A.M. Mitrašinović and T.A. Utigard, Metall. Mater. Trans. B 43B, 379 (2012).
S. Esfahani and M. Barati, Metals Mater. Int. 17, 823 (2011).
S. Esfahani and M. Barati, Metals Mater. Int. 17, 1009 (2011).
E. Bonnier, H. Pastor, J. Driole, Metallurgie, 7, 299 (1965–1966).
J. Driole and E. Bonnier, Metallwiss. Tech. 25, 2 (1971).
Z. Yin, A. Oliazadeh, S. Esfahani, M. Johnston, and M. Barati, Can. Metall. Q. 50, 166 (2011).
T. Ikeda and M. Maeda, ISIJ Int. 32, 635 (1992).
K. Suzuki, K. Sakaguchi, T. Nakagiri, and N. Sano, J. Jpn. Inst. Metals 54, 161 (1990).
J.C.S. Pires, A.F.B. Braga, and P.R. Mei, Sol. Energy Mater. Sol. Cells 79, 347 (2003).
J.C.S. Pires, J. Otubo, A.F.B. Braga, and P.R. Mei, J. Mater. Proc. Technol. 169, 16 (2005).
K. Hanazawa, N. Yuge, and Y. Kato, Mater. Trans. 45, 844 (2004).
H.C. Theuerer, J. Metals 8, 1316–1319 (1956).
D. Morvan, J. Amouroux, M.C. Charpin, and H. Lauvrey, Rev. Phys. Appl. 18, 239 (1983).
K. Suzuki, T. Kumagai, and N. Sano, ISIJ Int. 32, 630 (1992).
T. Ikeda and M. Maeda, Mater. Trans., JIM 37, 983 (1996).
N. Nakamura, H. Baba, Y. Sakaguchi, and Y. Kato, Mater. Trans. 45, 858 (2004).
D. Lynch, JOM 61, 41–48 (2009).
Y. Delannoy, C. Alemany, K.-I. Li, P. Proulx, and C. Trassy, Sol. Energy Mater. Sol. Cells 72, 69 (2002).
C. Alemany, C. Trassy, B. Pateyron, K.-I. Li, Y. Delannoy, Sol. Energy Mater. Sol. Cells 72, 41 (2002).
S. Tsao and S.-S. Lian, Mater. Sci. Forum 475–479, 2595 (2005).
S. Rousseau, M. Benmansour, D. Morvan, and J. Amouroux, Sol. Energy Mater. Sol. Cells 91, 1906 (2007).
S. Magnaval, D. Morvan, J. Amouroux, S.N. Kuok Shy, and S. Dresvin, High Temp. Mater. Proc. 3, 355 (1999).
M. Benmansour, E. Francke, D. Morvan, J. Amouroux, and D. Ballutaud, Thin Solid Films 403–404, 112 (2002).
F. Bourg, S. Pellerin, D. Morvan, J. Amouroux, and J. Chapelle, Sol. Energy Mater. Sol. Cells 72, 361 (2002).
D. Morvan, I. Cazard-Juvernat, and J. Amouroux, J. Mater. Res. 13, 2709 (1998).
S. Darwiche, M. Nikravech, D. Morvan, J. Amouroux, and D. Ballutaud, Sol. Energy Mater. Sol. Cells 91, 195 (2007).
M. Benmansour, S. Rousseau, and D. Morvan, Surf. Coat. Technol. 203, 839 (2008).
B.R. Bathey and M.C. Cretella, J. Mater. Sci. 71, 3077 (1982).
M. Thiagarajan, K. Iyakutti, E. Palaniyandi, and M. Mahendran, Int. J. Quantum Chem. 58, 383 (1996).
Y.Q. Lai, M. Jia, Z.L. Tian, J. Li, J.F. Yan, J.G. Yi, Z.G. Wang, and Y.X. Liu, Metall. Mater. Trans. A 41A, 929 (2010).
R. Monnier and J.C. Giacometti, Helv. Chim. Acta 47, 345 (1964).
R. Monnier, D. Barakat, J.C. Giacometti, US Patent No. 3,254,010, 1966, General Trustee Co. Inc.
R. Monnier, D. Barakat, US Patent No. 3,219,561, 1965, General Trustee Co. Inc.
J.M. Olson and K.L. Carleton, J. Electrochem. Soc. 128, 2698 (1981).
Sharma and T. Mukherjee, Metall. Trans. B 17B, 395 (1986).
X. Zou, H. Xie, Y. Zhai, X. Lang, J. Zhang, in Proceeding of Advanced Materials Research (Shenyang, China, 2012), pp. 697–702.
O.E. Kongstein, C. Wollan, S. Sultana, and G.M. Haarberg, ECS Trans. 3, 357 (2007).
J. Cai, X.T. Luo, G.M. Haarberg, O.E. Kongstein, and S.L. Wang, J. Electrochem. Soc. 159, D155 (2012).
W. Hoopes, F.C. Frary, J. D. Edwards, US Patent No. 1,534,318, 1925, Aluminium Co. of America.
R.A. Gadeau, US Patent No. 2,034,339, 1936, Prod Chim Electro.
E. Olsen and S. Rolseth, Metall. Mater. Trans. B 41B, 295 (2010).
E. Olsen, S. Rolseth, and J. Thonstad, Metall. Mater. Trans. B 41B, 752 (2010).
H. Momokawa and N. Sano, Metall. Trans. B 13B, 643 (1982).
M. Tanahashi, H. Nakahigashi, K. Takeda, C. Yamauchi, in Yazawa Internation Symposium, vol. 1: Thermo and Physicochemical Principles (TMS, Warrendale, PA, 2003), pp. 173–186.
L. Teixira, Y. Tokuda, T. Yoko, and K. Morita, ISIJ Int. 49, 777 (2009).
L. Teixira and K. Morita, ISIJ Int. 49, 783 (2009).
K. Suzuki, N. Sano, in Proceedings of the 10th E.C. Photovoltaic Solar Energy Conference (Kluwer, Dordrecht, 1991), pp. 273–275.
J. Cai, J.T. Li, W.H. Chen, C. Chen, and X.T. Luo, Trans. Nonferrous Metals Soc. China 21, 1402 (2011).
H. Fujiwara, J. Yuan, K. Miyata, E. Ichise, and R. Otsuka, J. Jpn. Metals 60, 65 (1996).
M.D. Johnston and M. Barati, Sol. Energy Mater. Sol. Cells 94, 2085 (2010).
C.H. Yin, B.F. Hu, and X.M. Huang, J. Semicond. 32, 12 (2011).
M. Li, T.A. Utigard, M. Barati, in Proceedings of the Ninth International Conference on Molten Slags, Fluxes and Salts, Beijing, China, 27–30 May 2012.
S. Tabuchi and N. Sano, Metall. Trans. B 15B, 351 (1984).
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Financial support for the group’s research work from NSERC is greatly appreciated.
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Johnston, M.D., Khajavi, L.T., Li, M. et al. High-Temperature Refining of Metallurgical-Grade Silicon: A Review. JOM 64, 935–945 (2012). https://doi.org/10.1007/s11837-012-0384-3
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DOI: https://doi.org/10.1007/s11837-012-0384-3