Patent ID: 9660036
Date: 2017-05-23
CPC Classifications: C01B,H01L,Y02E,Y02P

Claim:
1. A method of forming a graphene layer, the method comprising: forming a first graphene on a first region of an underlayer at a first temperature using a first source gas, the first graphene having an exposed lateral side; and forming a second graphene on a second region adjacent to the first region of the underlayer at a second temperature using a second source gas after the forming of the first graphene, the second graphene being joined to the exposed lateral side of the first graphene, wherein the first graphene is a P-type graphene, the second graphene is an N-type graphene, and the first graphene and the second graphene together form a P-N junction, and wherein the P-type graphene is formed at the first temperature, and after the forming of the P-type graphene, the N-type graphene is formed at the second temperature which is lower than the first temperature.