Low-dimensional carbon nanostructures such as nanotubes (CNTs) and graphene have excellent electronic,
optoelectronic and mechanical properties, which provide fresh opportunities for designs of optoelectronic devices of
extraordinary performance in addition to the benefits of low cost, large abundance, and light weight. This work
investigates photodetectors made with CNTs and graphene with a particular focus on carbon-based nanohybrids aiming
at a nanoscale control of photon absorption, exciton dissociation and charge transfer. Through several examples
including graphene/GaSe-nanosheets, graphene/aligned ZnO nanorods, SWCNT/P3HT, and SWCNT/biomolecule, we
show an atomic-scale control on the interfacial heterojunctions is the key to high responsivity and fast photoresponse in
these nanohybrids optoelectronic devices.