Electronic Structure of C60, CuPc, and C60/CuPc Nanoparticles and their Layers

The idea to form C₆₀/CuPc dispersed nanoheterojunctions by photoexcitation of a mixture of C₆₀ and CuPc nanoparticles has been realized. The electronic structure of the nanoparticles and dispersed nanoheterojunctions formed in the mixture has been characterized by UV-Vis spectroscopy and the comparing with known experimental ultraviolet photoelectron spectra and theoretical models of electronic structure of these molecules. For the mixture of C₆₀ and CuPc nanoparticles in toluene and their coating layer on the quartz substrate the band offsets of the edges of CuPc VB and lowest unoccupied molecular orbital (LUMO) of C₆₀ band are ΔE=1.55 eV and 1.4 eV, respectively. These results show clearly the presence of C₆₀/CuPc dispersed nanoheterojunctions in the solution and on the quartz surface.