韩国采购需求：中国优质硅棒，中国制造商，中国硅锭，中国供应商，晶体生长，晶体拉制

I represent the Dept. of Semiconductor Electronics at Chungbuk Provincial University in South Korea, and I'm in search of a silicon ingot supplier for educational purposes. We're interested in obtaining a silicon ingot, preferably 6 or 8 inches in diameter and 200mm long, produced via CZ, MCZ, or FZ methods. A key requirement is the tapering at the ends of the silicon ingot for student projects. Can you provide details on suitable products and a quotation? Your assistance would be greatly appreciated. Thank you!