New scaling of electron thermionic emission from graghene

Summary form only given. In this paper, we develop a model to investigate the electron thermionic emission from a single-layer graphene (See Fig.1 before). This study extends our prior efforts in showing that electron emission process from single-layer graphene is different from the traditional models. These studies include graphene field emission [1] and graphene laser-induced over barrier emission [2, 3]. Here, a new scaling for thermionic emission from graphene is established, which is different from the conventional Richardson equation derived for bulk metals. An analytical formula is obtained which agrees well with numerical results. The emitted current density at different temperatures, and Fermi energy levels are calculated. Its application as a thermionic energy convertor is discussed.