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Images obtained from scanning electron microscopy show the surface morphology of the TiO2 nanoparticle/MoS2 nanocomposite film (a) with a 100 nm scale bar and (b) with a 30 nm scale bar to yield a closer view. The circled regions correspond with aggregation of MoS2 with TiO2 particles.
Raman spectrum obtained from the TiO2/MoS2 nanocomposite film. The inset shows the photograph of three prepared nanocomposite films. One of the representative peaks of MoS2 is 407 cm−1, sitting between the signature of MoS2 monolayer (405 cm−1) and that of bulk MoS2 film (409 cm−1), suggesting the co-existence of both monolayer and multilayer flakes.
(a) Energy band structure of TiO2/MoS2/P3HT active layers with TiO2 surface states that capture photo-excited electrons from the conduction band leading to a dominant recombination with hole either at the valence band of MoS2 or HOMO of the P3HT. (b) Cross sectional schematic view of the fabricated BHJ solar cell.
Dark and illuminated J-V characteristics of the fabricated BHJ solar cell with TiO2/MoS2 nanocomposite film.
Semi-log plot of the dark J-V characteristics. The circled region shows the applied biasing voltage region in which the current density values were used for diode model fitting. The inset shows the curve fitting to extract the dark saturation current.
The EQE spectrum of the TiO2/MoS2/P3HT BHJ solar cell in the wavelength range of 350 nm ∼ 800 nm.
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