Abstract
Carbon nanomaterials can be excellent conductors or the semiconductors with variable band gap according to their different atom hybridizations. For example, two-thirds of single-walled carbon nanotubes (SWCNTs) and fullerenes exhibit semiconducting properties, while one-thirds of SWCNTs and graphene are metallic with ultrahigh mobility. Except for SWCNT- and graphene-based heterostructures with other materials, all-carbon van der Waals (vdW) heterojunctions composed of two or three type carbon nanostructures have also great potential for next-generation ultrahigh performance photodetectors. In this chapter, the formation methods of all-carbon vdW heterojunctions will be firstly introduced, and then we will summarize systematically the state-of-art research progress on all-carbon vdW heterojunction photodetectors, including zero dimensional (0D)/one dimensional (1D), 0D/2D, and 1D/2D vdW heterojunctions. Finally, we also highlight the current challenges and the future perspectives of all-carbon vdW heterojunction photodetectors.