Development of high-quality silicon solar cells using nucleation control by external factors and material cycling process

• Project/Area Number: 26289281
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Metal making/Resorce production engineering
• Research Institution: Kyushu University
• Principal Investigator: Miyahara Hirofumi 九州大学, 工学研究院, 教授 (90264069)
• Co-Investigator(Kenkyū-buntansha): 成田 一人 大阪教育大学, 教育学部, 准教授 (50404017)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000); Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2015: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2014: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
• Keywords: 結晶成長 / ファセット / 一方向凝固 / 過冷度 / 太陽光発電 / 双晶 / 金属生産工学 / 電子・電気材料 / ファセット系結晶 / ファセット成長 / ファセット界面

Outline of Final Research Achievements

Control technique of a silicon crystal size and morphology focusing on a nucleation and an initial solidification stage and control theory of a remelting and solidification structure of cutting chips are investigated in polycrystalline silicon for a solar cell. It was revealed that the whole crystal grain size of the ingot was significantly influenced by the supercooling at a nucleation and an initial solidification stage in the unidirectional solidification of facet material. At this time, the convection was forcefully introduced in the liquid region of specimen by applying a low frequency motion from the outside. That leads the reduction of frequency of nucleation at the initial solidification and eventually contributes the preferential direction growth and development of silicon crystals.

Research Products

• [Journal Article] レーザ表面溶融処理により急速凝固させた球状黒鉛鋳鉄の表面組織と特性 (2017)
  • Author(s): 村上玲太, 成田一人, 宮原広郁
  • Journal Title: 溶射 Volume: 54(1) Pages: 12-17
  • Peer Reviewed / Open Access
• [Journal Article] Fundamental analysis of metal film formation by atomizer (2016)
  • Author(s): T. Yamaguchi, N. Teshima, H. Miyahara
  • Journal Title: Proc. of The 6th Korea-Japan Conference for Young Foundry Engineers Volume: 6 Pages: 72-74
• [Journal Article] Effect of vibration on unidirectional solidification microstructure for polycrystalline silicon (2016)
  • Author(s): N. Teshima, Y. Fuchigami, I. Narita and H. Miyahara
  • Journal Title: Proc. of The 6th Korea-Japan Conference for Young Foundry Engineers Volume: 6 Pages: 82-84
• [Presentation] 多結晶シリコンの振動印加時の一方向凝固組織の解析 (2017)
  • Author(s): 木田嶺介，手嶋直人,宮原広郁
  • Organizer: 日本金属学会 日本鉄鋼協会 合同学術講演会
• [Presentation] ファセット型結晶の一方向凝固組織に及ぼす低周波振動の影響 (2017)
  • Author(s): 木田嶺介,手島直人,成田一人,宮原広郁
  • Organizer: 日本金属学会第161回秋期講演大会
• [Presentation] 多結晶シリコンインゴットの一方向凝固組織に及ぼす振動の影響 (2016)
  • Author(s): 手嶋直人，淵上遥平，成田一人，宮原広郁
  • Organizer: 日本鋳造工学会九州支部第69回講演大会
  • Place of Presentation: 北九州市
  • Year and Date: 2016-04-07
• [Presentation] 溶融金属の微粒子化および薄膜化に関する基礎的研究 (2016)
  • Author(s): 山口智哉，手嶋直人，宮原広郁
  • Organizer: 日本金属学会鉄鋼協会合同学術講演大会
  • Place of Presentation: 福岡
• [Presentation] 多結晶シリコンインゴットの一方向凝固組織に及ぼす振動の影響 (2016)
  • Author(s): 手嶋直人，淵上遥平，成田一人，宮原広郁
  • Organizer: 日本鋳造工学会九州支部講演大会
  • Place of Presentation: 福岡
• [Presentation] 多結晶シリコンの一方向凝固組織に及ぼす振動の影響 (2015)
  • Author(s): 手嶋直人，淵上遥平，成田一人，宮原広郁
  • Organizer: 日本金属学会鉄鋼協会九州支部合同学術講演会
  • Place of Presentation: 北九州市
  • Year and Date: 2015-06-06
• [Presentation] 多結晶シリコンインゴットの初期凝固組織に及ぼすα-Si3N4およびβ-Si3N4の影響 (2014)
  • Author(s): 池田達也，内野隆志，成田一人，宮原広郁
  • Organizer: 日本金属学会第155回秋期講演大会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2014-09-24 – 2014-09-26