Semiconductor and electrochromic properties of electrochemically deposited nickel oxide films

p -Type semiconducting nickel oxide as an efficiency-enhancing anode interfacial layer in polymer bulk-heterojunction solar cells

“…A frequently cited value is 5.0 eV (20,23,44,52) while the valence band maximum (VBM) of undoped NiO is ϳ0.4 eV below E f (Fig. 2B) (52,53). In the present BHJ devices, NiO functions as both a hole-transport and an electron-blocking layer.…”

“…The reported E f for undoped NiO ranges from 3.8 eV (49) to 5.4 eV (50) and has been found to depend on the deposition substrate (51) and the NiO surface treatment (49). A frequently cited value is 5.0 eV (20,23,44,52) while the valence band maximum (VBM) of undoped NiO is ϳ0.4 eV below E f (Fig. 2B) (52,53).…”

Complete Water Splitting with Multi-Component Catalysts: Proposed Mechanism of Charge Transport in NiOx Loaded SrTiO3 Photocatalyst for Complete Water Splitting

“…This could explain the larger Fermi level depression of n-type STO when paired with p-type NiO. Given that the E Fn level of NiO (+0.67 V) [15] is lower than STO (-0.87 V), Fermi level depression is expected for STO when forming a p/n junction with NiO. Unmodified STO shows the highest onset potential (-0.87 V) and a small DCPD (-0.07 V) originating from a low photocharge response.…”

Effect of Sensitization on the Electrochemical Properties of Nanostructured NiO

“…When nanostructured NiO is employed in the configuration of thin film (thickness, l < 10 µm) it displays photoelectrochemical activity in the presence of opportune redox mediators (e.g., the redox couple I − /I 3 − ) [24]. Moreover, nanostructured films of NiO present solid-state electroactivity [25][26][27] due to the verification of a series of reversible electrochemical processes that switch the properties of electrical transport [28] and optical absorption [29] of the oxide itself. The optical [10][11][12][13][14]30,31], magnetic [32,33], electrochemical [34], and photoelectrochemical [35,36] properties of NiO (either in the bulk state or in the nanostructured version) are considerably altered when the surface of the oxide is dye-sensitized [37].…”