▎ 摘　　要

Graphene-carbon nanotubes (CNTs) nanocomposites hold tremendous potential to offer more innovative and cost-effective electronic technologies. In this study, type of CNTs employed to form composites with reduced graphene oxide (rGO) were single walled carbon nanotubes (SWCNTs), multiwalled carbon nanotubes (MWCNTs), and mixed CNTs (blends of SWCNTs and MWCNTs). The composites were further utilized to fabricate the planar heterojunction devices. Field emission scanning electron microscopy, UV-Vis and Raman spectroscopy of the synthesized nanocomposites were performed to investigate the surface morphology, ab-sorption behavior and structure, respectively. On comparing the optoelectronic performance of devices, we found that mixed CNTs-rGO nanocomposite-based devices exhibited greater responsivity and detectivity compared to those of SWCNTs and MWCNTs based devices. The superior performance is mainly ascribed to the better immunity of the mixed CNTs-rGO nanocomposite-based devices against the charge recombination due to the better interface quality and lesser interface defects, as inferred from the dark current analysis and impedance spectroscopy analysis. This work demonstrates the great potential of mixed CNTs-rGO composites as an active layer material for optoelectronic applications.