Optimization of the granulation binders of high-purity carbothermic reduction for solar-grade silicon

Abderahmane Boucetta, Rabie Benioub, Amina Chahtou, Sidi Mohammed Heddadj, Takuya Ogasawara, Yasubumi Furuya, Saad Hamzaoui, Kenji Itaka

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The direct carbothermic reduction process from high-purity silica is promising for next-generation low-cost silicon solar cells. In this process, the granulation process is essential to avoid blowout of the silica powder. In this study, we investigated the effect of binders on this reduction process using four kinds of binders. The real-time monitoring of the chamber pressure and quadrupole mass spectroscopic analysis indicated the sign of the blowout phenomena of the generated CO gas and decomposition gas of the binders. In the case of starch and sucrose, the strengths of granules were not enough to the process with the pressure of the generated CO gas, while the granules with enough strength, namely, the ones with polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC), resulted in silicon yield of 33.8% and 27.8%, respectively.

Original languageEnglish
Pages (from-to)1936-1944
Number of pages9
JournalMaterials Transactions
Issue number11
Publication statusPublished - 2016
Externally publishedYes


  • Carbothermic reduction
  • Carboxymethyl cellulose
  • Polyvinyl alcohol
  • Powder granulation
  • Solar-grade silicon

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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