Today’s climate is undeniably affected by human influences. The enhanced emission of greenhouse gasses started with early settlements, increased dramatically during the industrial revolution, and is still proceeding. One way to reduce greenhouse gas emission is the promotion of renewable energies. The most abundant energy source available on earth is sunlight, which can be converted into electricity via solar cells. All-carbon solar cells are considered as a cheap and environmentally friendly energy source. Alongside manifold possible applications due to their extraordinary physical and optical properties, single wall carbon nanotubes (SWCNT) play an important role in this kind of solar cells, in which they serve as a conductor or light absorbing material. Many applications of SWCNTs benefit from tailored properties of SWCNTs, as well as individualized and chirally sorted SWCNTs. A way to approach this, without compromising the intrinsic properties of SWCNTs, is non-covalent functionalization. In this work, novel photoactive supramolecular assemblies of SWCNTs and molecular dyes are presented. Thorough characterization was guaranteed by spectroscopy, microscopy, and electrochemistry. In particular, steady state absorption and fluorescence spectroscopy, excitation spectroscopy, time-correlated single photon counting, transient absorption spectroscopy, Raman mapping, atomic force microscopy, transmission electron microscopy, cyclic voltammetry, differential pulse voltammetry, square wave voltammetry, and spectroelectrochemistry were applied. Of particular interest were investigations on debundling and/or individualization of SWCNTs, doping of SWCNTs, and possible energy and/or charge transfer between both SWCNTs and dyes. In addition, chiral selectivity and its relation to the molecular structure of the dyes was investigated. The flat or twisted π-systems are either located directly on top of SWCNTs or are immobilized by means of a pyrene anchor. Furthermore, SWCNTs are wrapped by oligomeric π-systems or interlocked by a ring of linked π-systems. The successful formation of the supramolecular assemblies in dispersion was ascertained for all investigated systems. In the case of individual π-systems on SWCNTs, three water soluble perylenediimides with an increasing number of bromine substituents at the bay positions were interfaced with SWCNTs. This substitution pattern induces different twist angles in the perylenediimides and different electron accepting character. In addition, the variation in substitution leads to different absorption, fluorescence, excited state dynamics, and aggregation behavior. In supramolecular assemblies with SWCNTs in D2O, the stability in dispersion, the doping of SWCNTs, electronic interactions, and chiral selectivity also vary between the assemblies with differently substituted perylenediimides. Photoinduced charge separation and hole migration ii in SWCNTs were observed in all assemblies. Other examples for individual π-systems on SWCNTs are two asymmetrically substituted, alkylated zinc porphyrins featuring an amphiphilic character. Their aggregation behavior in THF:water (1:1 v/v) changed significantly in assemblies with SWCNTs. Moreover, photoinduced charge separation was observed. In addition, free base and zinc porphyrins with bulky substituents at their meso-position were anchored onto SWCNTs via pyrene anchors. These anchors consisted of either one or three pyrenes. It was shown that the bulky substituents, the geometry of the linker, and the number of pyrenes affect the properties of supramolecular assemblies with nanocarbons. Whereas no direct interaction or charge transfer between the porphyrins and SWCNTs was observed in dispersions, doping was verified in the solid state. Furthermore, oligomeric, alkylated anthanthrene molecules wrapped around SWCNTs in DMF and ethanol were investigated. Upon formation of the assembly with SWCNTs, the oligomeric anthanthrenes changed their characteristics related to aggregation and excimer-like structures. Besides electronic interactions in the ground and excited state, energy transfer upon photoexcitation was confirmed. Turning to the mechanically interlocked SWCNTs, the investigated interlocked ring around SWCNTs consists of zinc porphyrins. Pronounced chiral selectivity with respect to the diameter of the SWCNTs was corroborated upon formation of this very stable assembly. In addition, doping of the SWCNTs and photoinduced charge transfer was verified.