Yingli Green Energy Holding Co. Ltd. has completed trial production of monocrystalline ingots using a carbon-carbon (C-C) composite material. Typically, such ingots are produced using traditional graphite crucibles.
According to Yingli, the production graphite crucibles used in monocrystalline ingot production are prone to cracking during the heating process, resulting in wastage or some percentage of substandard products. C-C composite crucibles, the company says, have higher thermal resistance.
Yingli says transitioning to C-C composite crucibles will reduce the per-unit cost of furnace crucibles, improve the stability of crystal pulling and increase the utilization rate of monocrystalline silicon ingots by approximately 3%. The company estimates that the new material could reduce manufacturing costs by nearly $0.01/W.