Thermoelectric properties of topological insulators based on π-stacked molecular and graphene-belt systems with hydrogen bonds

Recently, new two-dimensional topological crystalline insulators were theoretically predicted in the family of molecular networks and graphene nanobelts. The planar structures are vertically stacked in columns formed via the π-type interactions between benzene rings. Moreover, the molecular or graphene-belt parts interact with each other via the hydrogen bonds, due to their termination with O and H. These organic materials possess flat band structures, which are characteristic for weakly interacting systems. As a consequence, the thermolectric power is high and excess that of graphene nearly four times. (paper)