成果報告書詳細
管理番号20120000000571
タイトル*平成23年度中間年報 太陽エネルギー技術研究開発 太陽光発電システム次世代高性能技術の開発 太陽電池用シリコンの革新的プロセス研究開発(Si 精製プロセスの開発)
公開日2012/12/21
報告書年度2011-2011
委託先名国立大学法人東京大学生産技術研究所
プロジェクト番号P07015
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等
【背景】
太陽電池の更なる低コスト化・高効率化に資することを目的に、太陽光発電システム次世代高性能技術の開発を行う。
英文要約Title: Research and Development of Innovative Processes for Solar Grade Silicon (Development of Si Refining Process) (Fy2010-2012) FY2011 Annual Report
The goal of the research at the Institute of Industrial Science, the University of Tokyo is to establish production processes for solar grade silicon with lower cost and higher efficiency in collaboration with Taiheiyo Cement Corporation and Hirosaki University. The processes are composed of production of highly pure amorphous SiO2, reduction of the SiO2 into pure silicon and the refining of silicon. The University of Tokyo, IIS is in charge of the refining part, mostly on the removal of P and B by acid leaching and slag treatment.In 2011, we have investigated the reduction removal of P from molten silicon using CaO-CaF2 slags with Ca addition. In addition, acid leaching was performed to investigate the further removal of P from the samples after the slag treatment. Following the experimental procedures established in 2010, several experiments with CaO-CaF2 slag were carried out using the setup composed of MoSi2 high temperature furnace and the analytical system. Dephosphorization was observed for each sample. P contents of Si were reduced from 210 ppm, 360 ppm and 31 ppm to 39 ppm, 222 ppm and 8.6 ppm, respectively. On the other hand, Ca contents of Si show drastic increase from 150 ppm, 600 ppm and 2.6 ppm to 2.1 mass%, 3.7 mass% and 0.13 mass%. From the results, slag with high basicity (CaO content) showed higher dephosphorization ratio in spite of the high oxygen potential. Also, higher temperature treatment showed higher dephorization ratio. Although one of the samples was Si-84mass%SiC mixture produced by Taiheiyo Cement Corporation from there original purified SiO2, slag refining effect was almost the same as others. Further leaching treatment showed the decrease in both P and Ca contents. P content decreased from 222 ppm and 8.6 ppm to 43 ppm and 1.2 ppm, respectively, while Ca content from 3.7 mass% and 0.13 mass% to 0.040 mass% and 0.048 mass%. In 2012, optimization of each treatment will be performed and the possibility of B removal will be also investigated.
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