Graphene, which is a single layer of graphite, has a linear dispersion relationship and has extremely superior electrical properties compared to conventional semiconductor materials. These properties will be discussed from atomic bonding, energy band calculations, electron transport equations, etc. In addition, there are many layered materials such as MoS2, which are two-dimensional materials with a band gap, and because of their thickness at the atomic level, they are expected to be applied as materials for next-generation electronic devices. Learn about the origin of this band structure, transport characteristics, etc. The basic stance of this course is to understand the electrical characteristics and device characteristics by starting from the basics of properties of conventional semiconductors, even though we will deal with two-dimensional systems such as graphene and MoS2.