Principles and Techniques of Diffuse‐Reflectance Spectroscopy

Kortüm, G.; Braun, W.; Herzog, G.

doi:10.1002/anie.196303331

Cited by 357 publications

(214 citation statements)

References 33 publications

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“…As shown in Figure 1c, the n = 5 compound has an optical bandgap of 1.83 eV (≈678 nm), determined by converting diffuse reflectance to absorbance via Kubelka-Munk transformation. [40,41] As the number of inorganic slabs increases from n = 1 to n = 5, the bandgap gradually decreases, increasing absorption in the near-infrared (NIR) region. By comparison the bandgap of the 3D parent compound, MAPbI 3 , is ≈1.52 eV.…”

Section: Materials Synthesis and Characterizationmentioning

confidence: 99%

Understanding Film Formation Morphology and Orientation in High Member 2D Ruddlesden–Popper Perovskites for High‐Efficiency Solar Cells

Soe

Nie

Stoumpos

et al. 2017

Advanced Energy Materials

298

273

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International audience2D Ruddlesden–Popper (RP) perovskites have recently emerged as promising candidates for hybrid perovskite photovoltaic cells, realizing power-conversion efficiencies (PCEs) of over 10% with technologically relevant stability. To achieve solar cell performance comparable to the state-of-the-art 3D perovskite cells, it is highly desirable to increase the conductivity and lower the optical bandgap for enhanced near-IR region absorption by increasing the perovskite slab thickness. Here, the use of the 2D higher member (n = 5) RP perovskite (n-butyl-NH3)2(MeNH3)4Pb5I16 in depositing highly oriented thin films from dimethylformamide/dimethylsulfoxide mixtures using the hot-casting method is reported. In addition, they exhibit superior environmental stability over thin films of their 3D counterpart. These films are assembled into high-efficiency solar cells with an open-circuit voltage of ≈1 V and PCE of up to 10%. This is achieved by fine-tuning the solvent ratio, crystal growth orientation, and grain size in the thin films. The enhanced performance of the optimized devices is ascribed to the growth of micrometer-sized grains as opposed to more typically obtained nanometer grain size and highly crystalline, densely packed microstructures with the majority of the inorganic slabs preferentially aligned out of plane to the substrate, as confirmed by X-ray diffraction and grazing-incidence wide-angle X-ray scattering mapping

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Section: Materials Synthesis and Characterizationmentioning

confidence: 99%

Understanding Film Formation Morphology and Orientation in High Member 2D Ruddlesden–Popper Perovskites for High‐Efficiency Solar Cells

Soe

Nie

Stoumpos

et al. 2017

Advanced Energy Materials

298

273

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“…The single-beam spectrum of the corresponding pretreated catalyst was used as background to generate the spectrum of adsorbed CO. The spectra of adsorbed CO are presented in Kubelka-Munk units F(R ∞ ) = (1 − R ∞ ) 2 /2R ∞ [30][31][32]. CO isotherms were recorded by dosing CO at increasing equilibrium pressures ranging from 0.1 to 1 3 80 mbar.…”

Section: Drifts Measurementmentioning

confidence: 99%

IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer

et al. 2017

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“…159 Instead of passing a beam of light through a sample, light is reflected off the sample inside an integrating…”

Section: Diffuse Reflectance Uv-vis Spectroscopy (Drs)mentioning

confidence: 99%

Graphene-wrapped hierarchical TiO2 nanoflower composites with enhanced photocatalytic performance

et al. 2013

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Graphene-wrapped titanium dioxide nanoflower composites (G-TiO 2 ) consisting of nanosheets and nanoparticles were synthesized using a two-step solvo/hydrothermal process. Materials were characterized using SEM, TEM, high-resolution TEM (HRTEM), XRD, Raman spectroscopy, and FTIR.Further analysis was performed using Branauer-Emmett-Teller (BET) specific surface area analysis, electrochemical impedance spectroscopy (EIS), UV-Vis spectroscopy, and diffuse reflectance UV-Vis spectroscopy. Photocatalytic activity was determined by the photo-degradation of methylene blue under UV irradiation. Results show that the TiO 2 nanoflower exhibits a higher photocatalytic activity than commercial P25 by a factor of 1.49. This is attributed to the highly crystalline, hierarchical nature of the nanoflower structure, which provides improved charge transport and a reduced recombination rate of photo-generated electron-hole pairs. After wrapping with graphene, the G-TiO 2 composite can further improve the photocatalytic performance by providing a planar conjugated surface for dye adsorption, by further reducing recombination through accepting electrons from TiO 2 , and by causing a red shift in light absorption. The highest photocatalytic performance was found using a graphene loading of 5 wt%, which outperforms commercial P25 by a factor of 3.4.

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Principles and Techniques of Diffuse‐Reflectance Spectroscopy

Cited by 357 publications

References 33 publications

Understanding Film Formation Morphology and Orientation in High Member 2D Ruddlesden–Popper Perovskites for High‐Efficiency Solar Cells

Understanding Film Formation Morphology and Orientation in High Member 2D Ruddlesden–Popper Perovskites for High‐Efficiency Solar Cells

IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer

Graphene-wrapped hierarchical TiO2 nanoflower composites with enhanced photocatalytic performance

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