“…DFT theoretical calculations of the partial density of states for NbN show all the electron orbits across the Fermi level plane ( Figure S10), suggesting that NbN is metallic as it was reported. 25 Additionally, the work functions of the Pt, NbN, CdS, and NC-1 are about 5.25, 5.18, 4.6 and 5.06 eV, respectively as measured from Kelvin probe ( Figure 3A). The metallic NbN possesses lower Fermi level than that of CdS, suggesting it be an electron collector in the NbN/CdS heterojunctional nanocomposite.…”