Single-wall carbon nanotubes (SWCNTs) are renowned for their outstanding charge carrier mobility, optical, thermal, and mechanical properties. Combining these characteristics with their nanometer-scale diameter renders them highly promising for developing (opto)-electronic devices, where the challenge lies in achieving miniaturization without compromising performance. In addition to their intrinsic characteristics, SWCNTs feature a hollow core that can be filled with various molecules1, resulting in unique one-dimensional hybrids that integrate the properties of the nanotube with those of the encapsulated molecule. This study emphasizes recent advancements, particularly the extensive chirality-sorting2 of these hybrids and a novel methodology utilizing vapor phase infiltration and tailored synthesis strategies to create new fillers. These approaches aim to enhance control over the filling process for finer tuning of the SWCNT doping level or their photosensitization/reactivity capabilities under visible light.