无转移高品质石墨烯晶圆，衬底为蓝宝石，1层（单层率90%以上），透光率85.7%，2英寸，2英寸

High quality graphene wafer without transfer, substrate is sapphire, 1 layer (single-layer rate of more than 90%), light transmittance of 85.7%, 2 inches, Two inches