Enhanced photoelectrochemical transient photoresponse properties of molybdenum oxide film deposited on black silicon

Photocatalytic Properties of Molybdenum Oxide Photoelectrode Synthesized by Spray Pyrolysis Method

“…The average τe is estimated to be 0.26 ms. This value is quite low and suggests a reasonable delay in the charge carrier recombination which support the observed significant photocurrent density [20,42].…”

“…where β is the full width at half maximum (FWHM) of the diffraction line, θ is the diffraction angle, and λ = 0.15418 nm is the wavelength of the X-ray radiation The estimate crystallite size is reasonably small, whereas the calculated values of the dislocation density, microstrain and stacking fault is somewhat high when compared to our previous report on MoO3 film prepared by the chemical vapour deposition method [20]. This is due to the large value of the peak width observed for the pyrolyzed MoO3 film.…”

“…The crystallite size D, dislocation density δ, microstrain ε and stacking fault SF are estimated using Eqs. 1-4 [19][20][21][22][23]. The structural parameters are estimated from the most preferential growth orientation of the films, that is the (210) peak.…”

“…Traditionally, three distinct frequency crests can be observed in a Bode phase plot [5]. The lowfrequency crest (10 -1 -1 Hz) scope marks the Nernst diffusion statement inside the electrolyte, the mid-frequency crest (1-10 2 Hz) scope is related to the charge carriers transport at the photoelectrode/electrolyte interface, and the high-frequency crest (10 3 -10 5 Hz) scope indicates the charge carriers transport at the Pt electrode/electrolyte boundary [2,20,40]. The response in the high-frequency crest scope around 1217.75 Hz for can be assigned to the charge carriers transport at the Pt electrode/electrolyte interface.…”

“…Liner sweep voltametric curves are recorded under illumination in a 1 M KOH solution in the bias range of 0-1.2 V vs. Ag/AgCl. The stability is observed in chronoamperometric mode for a duration of 500 s under chopped light illumination at a fixed bias of 1 V. Electrochemical impedance spectroscopy measurement is performed in the dark under an applied bias of 1 V vs. Ag/AgCl [2,20]. All the diffraction peaks can be indexed to the orthorhombic phase of MoO3 (α-MoO3) [20],…”