Home > Press Releases
JST Press Release

November 16, 2015
Japan Science and Technology Agency (JST)
5-3, Yonbancho, Chiyoda-ku, Tokyo 102-8666

Growth of Si ingots for solar cells with over 40 cm diameter using small size crucible with 50 cm diameter

Noncontact crucible (NOC) method to grow Si ingots with a larger diameter than 45 cm is proposed as a novel crystal growth method, which has several merits comparing with the Czochralski (CZ) method such as larger diameter ratio defined as crystal diameter / crucibles diameter (near 0.9) and lower oxygen concentration. The solar cells prepared by the present Si ingots has the highest conversion efficiency of 19.6% and the average conversion efficiency of 18.9% using the same solar cell structure and process to obtain the conversion efficiency of 20.0% for CZ wafers. Kazuo Nakajima and coworkers at JST succeeded to control temperature in NOC method by using a carbon heat holder.

That is expected to lead about 30% cut in costs for manufacturing a high quality Si wafer.

Researcher Information

MEXT FUTURE-PV Innovation (FUkushima Top-level United center for Renewable Energy research PhotoVoltaics Innovation)
Research Theme “Si Nano-Wire Solar Cells”

Presentation Information

K. Nakajima, S. Ono, R. Murai, Y. Kaneko, F. Jay, Y. Veschetti, and A. Jouini. “Growth of Si ingots for solar cells with 33 cm diameter using a small crucible with 40 cm diameter by Noncontact crucible method”. PVSEC-25, BEXCO, Busan, Korea, November 15-20 (2015).


[About Research]
Kazuo Nakajima, Ph.D.
Team Leader, FUTURE-PV Innovation, JST
URL: http://www.jst.go.jp/renewable/en/index.html

[About Program]
Terutake Koizumi, Ph.D.
FUTURE-PV Innovation, Department of Green Innovation, JST


JST, an integrated organization of science and technology in Japan, establishes an infrastructure for the entire process from the creation of knowledge to the return to the society. For more information, visit http://www.jst.go.jp/EN/