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

2017 Fiscal Year Final Research Report

• 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
• Keywords: 結晶成長 / ファセット / 一方向凝固 / 過冷度 / 太陽光発電

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.

Free Research Field

凝固