PbSe) 1.14 ] m (NbSe 2 ) n compounds with 1 ≤ m ≤ 6 and n = 1 were synthesized using the modulated elemental reactants (MER) method. X-ray diffraction patterns (XRD) showed that the desired compounds self-assembled during annealing of the precursors with their c-axis crystallographically aligned normal to the substrate. The c-axis lattice parameter increased by 0.612 nm as m, the number of PbSe bilayers, increased by one. Analysis of the in-plane diffraction patterns indicated that the a-lattice parameters remained constant as m was varied. Reciprocal space maps along hkl (h, k ≠ 0; l ≠0) indicate very short coherence lengths in mixed-index directions, consistent with the rotational disorder between layers observed in electron microscopy cross sections. The in-plane electrical resistivity and Hall coefficients were measured for each ferecrystal from 22 to 295 K. The resistivity systematically increased as m increased, but the magnitude of the increase is greater than predicted assuming independent layers. Assuming the metallic conduction results from a single band in the NbSe 2 layer, the carrier concentrations determined from the Hall coefficients decreases as m increases, suggesting increased charge transfer from PbSe to NbSe 2 with increasing values of m. First-principles electronic-structure calculations based on the generalized gradient approximation to density functional theory suggest that the PbSe valence band overlaps the empty bands in NbSe 2 , supporting the idea of interlayer charge transfer from PbSe to NbSe 2 .

The [(BiSe) 11d ] 1 (VSe 2 ) 1 heterostructure was characterized structurally and electrically to determine the effects of interlayer interaction on the charge density wave (CDW) found in VSe 2 and compared to previously reported [(SnSe) 1.15 ] 1 (VSe 2 ) 1 . Out-of-plane x-ray diffraction scans contain reflections that can be indexed as 00l reflections of a BiSe-VSe 2 supercell. Structure refinement indicates that the VSe 2 layer is very similar structurally to that found in [(SnSe) 1.15 ] 1 (VSe 2 ) 1 . Scanning transmission electron microscopy images show a turbostratically disordered layer structure and the formation of anti-phase boundaries in the BiSe bilayer. The [(BiSe) 11d ] 1 (VSe 2 ) 1 heterostructure is metallic with a negative Hall coefficient, in contrast to the positive Hall coefficient found for [(SnSe) 1.15 ] 1 (VSe 2 ) 1 . The CDW found [(SnSe) 1.15 ] 1 (VSe 2 ) 1 is not present in [(BiSe) 11d ] 1 (VSe 2 ) 1 . This work illustrates the importance of inter constituent interactions in determining the transport properties of single layer films.