Carrier recombination in Cu doped CdS thin films: Photocurrent and optical studies

Panda, Richa; Rathore, Vandana; Rathore, Manoj; Shelke, Vilas; Badera, Nitu; Chandra, L. S. Sharath; Jain, Deepti; Gangrade, Mohan; Shripati, T.; Ganesan, V.

doi:10.1016/j.apsusc.2012.01.131

Cited by 43 publications

(13 citation statements)

References 21 publications

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“…These results suggest that the charge separation efficiency exhibits an increasing trend along with the increase of x value from 0.03 to 0.10, and then a decreasing one with further enhancing the x value, and the Fe x Sr 1‐ x TiO 3 ( x = 0.10) has the most efficient charge separation process among those Fe‐doped products, which is in good agreement with the changing trend of photocatalytic performance shown in Figure a. The increasing charge separation efficiency might be contributed by more Fe 3+ ions doped at surface sites along with enhancing the x value from 0.03 to 0.10 as mentioned above, which can promote the photogenerated electron transfer of Fe‐doped SrTiO 3 ,, , while the decreasing charge one of Fe x Sr 1‐ x TiO 3 products with x > 0.10 can be due to the newly formed α‐Fe 2 O 3 NCs, which might act as charge recombination centers.…”

Section: Resultssupporting

confidence: 83%

“…Nevertheless, the single SrTiO 3 shows much lower PL peak intensity and higher photocurrent responses than those Fe x Sr 1‐ x TiO 3 (Figure ), suggesting that the single SrTiO 3 has the lowest defect concentration and charge recombination efficiency and Fe 3+ doping would generate defect states in the SrTiO 3 lattice to act as recombination sites, which is contrary to the actual result that the single SrTiO 3 shows very limited activity for N 2 fixation (Figure a). One of the main reasons is that the single SrTiO 3 has larger particle sizes and lower surface area than those Fe x Sr 1‐ x TiO 3 products (Figure ), which will not benefit to the adsorption and activation of N 2 molecules since the majority difficulty of N 2 fixation is the activation of high‐energy N≡N bond.…”

Section: Resultsmentioning

confidence: 67%

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Fabrication of an Fe‐Doped SrTiO₃ Photocatalyst with Enhanced Dinitrogen Photofixation Performance

et al. 2019

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SrTiO3 as semiconducting photocatalyst has been extensively investigated due to its band edges meeting the thermodynamic requirements for water splitting, but a few attention has been concentrated on its application in the NH3 synthesis via N2 photofixation process. Herein, Fe‐doped SrTiO3 (FexSr1–xTiO3) products (0 ≤ x ≤ 0.20) were synthesized via a hydrothermal process followed by calcination at 700 °C. All FexSr1–xTiO3 products (0.03 ≤ x ≤ 0.20) deliver an enhanced N2 fixation ability, and FexSr1–xTiO3 (x = 0.10) achieves the best NH3 production activity of 30.1 µmol g–1 h–1, which is 3.2‐hold higher than that of SrTiO3 alone. Once the x value is higher than 0.10, FexSr1–xTiO3 will transform into composites containing Fe‐doped SrTiO3 and α‐Fe2O3, which acts as charge recombination sites, thus causes a decreased N2 fixation activity. Further investigations demonstrate that the surface Fe3+‐doped sites can not only chemisorb and activate N2 molecules, but also promote the interfacial electron transfer from Fe‐doped SrTiO3 to N2 molecules, and thus significantly improve the N2 fixation ability. The present Fe‐doped SrTiO3 products exhibit characteristic features such as stable and efficient N2 fixation ability as well as simultaneous realization of N2 reduction and H2O oxidation without co‐catalyst, which are of significance in artificial photosynthesis with H2O as electron and proton sources.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 67%

Fabrication of an Fe‐Doped SrTiO₃ Photocatalyst with Enhanced Dinitrogen Photofixation Performance

et al. 2019

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“…For the Cu-doped CdS particles, excitonic emissions as well as surface state emission decreased after Cu doping; however, a new broad peak range from 650 nm to 850 nm emerged. This emission peak is clearly a Cu-related emission, which could be the Cu acceptor level (T2 level) originated from the triplet state of Cu 2+ [41]. With increase of doping level from 0.2% to 1%, this emission intensity decreased which could be the result of increasing nonradiative transitions from T2 level to the valence band of CdS with increase of Cu concentration in CdS [34].…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Activities of Copper Doped Cadmium Sulfide Microspheres Prepared by a Facile Ultrasonic Spray-Pyrolysis Method

Zhang

et al. 2016

Molecules

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Abstract:Ultrasonic spray pyrolysis is a superior method for preparing and synthesizing spherical particles of metal oxide or sulfide semiconductors. Cadmium sulfide (CdS) photocatalysts with different sizes and doped-CdS with different dopants and doping levels have been synthesized to study their properties of photocatalytic hydrogen production from water. The CdS photocatalysts were characterized with scanning electron microscopy (SEM), X-ray fluorescence-spectrometry (XRF), UV-Vis absorption spectra and X-ray diffraction (XRD) to study their morphological and optical properties. The sizes of the prepared CdS particles were found to be proportional to the concentration of the metal nitrates in the solution. The CdS photocatalyst with smaller size showed a better photocatalytic activity. In addition, Cu doped CdS were also deposited and their photocatalytic activities were also investigated. Decreased bandgaps of CdS synthesized with this method were found and could be due to high density surface defects originated from Cd vacancies. Incorporating the Cu elements increased the bandgap by taking the position of Cd vacancies and reducing the surface defect states. The optimal Cu-doped level was found to be 0.5 mol % toward hydrogen evolution from aqueous media in the presence of sacrificial electron donors (Na 2 S and Na 2 SO 3 ) at a pH of 13.2. This study demonstrated that ultrasonic spray pyrolysis is a feasible approach for large-scale photocatalyst synthesis and corresponding doping modification.

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“…However, major approaches for doping of TiO 2 with transition metal ions (V, Cu, Fe, etc.) 7 have been limited due to high carrier recombination rate, 9 introduction of new ancillary impurity phases, 10 and poisonous sensitization of dyes 11,12 . Therefore, anionic-doping (non-metal-doping) is considered a more promising approach due to suppression of the titanium d-states localization and its profound effect in the narrowing the TiO 2 bandgap as compared to cationic-doping.…”

Section: Introductionmentioning

confidence: 99%

Rapid and morphology controlled synthesis of anionic S-doped TiO₂ photocatalysts for the visible-light-driven photodegradation of organic pollutants

Bakar

Ribeiro

2016

RSC Adv.

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In recent years, growing concerned has been raised to the global problem from draining of organic pollutants into the water steam. Therefore, a great demand has been raised for development of efficient technologies for the treatment of wastewater pollution. Photocatalytic oxidation of organic pollutants under visible-light irradiation has several advantages for remediation of wastewater as compared to other any conventional adsorption techniques. This study reports a rapid and morphology controlled synthesis of anionic 1-D S-doped TiO2 photocatalysts by a facile and efficient oxidant peroxide route (OPM) and crystallized through hydrothermal method. In particular, S-doping into the TiO2 crystal lattice and formation of S-Ti-O bonds were confirmed by structural characterization of the as-prepared samples with the help of X-ray photoelectron spectroscopy, X-ray diffraction, UV-Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The asprepared S-doped TiO2 photocatalysts showed enhanced photocatalytic activity for the liquid phase degradation of the organic compound (methyl orange) under visible-light irradiation (>420 nm) as compared to the undoped TiO2. To extend the viability for the photocatalytic activity of as-prepared S-doped TiO2 nanorods, other organic compounds (RhB and phenol) were also tested for photodegradation experiments. The promising effects of OPM treatment for S-doping and enhanced photocatalytic performance were observed due to large porous channels of nanorods, pure anatase phase crystallization, the high surface, excellent stability from photocorrosion, enhanced absorbance shifts toward visible-light region, improved effective interfacial charge transfer, and enhanced efficiency for separation of photoinduced electronhole pairs. The optimum photocatalytic activity was achieved for the ATO-3 sample for the degradation of the organic compounds under visible-light irradiation and was ~8.12 times higher for MO as compared to undoped TiO2. The synergistic effect and role of active species i.e. superoxide radical anions ( • O -2) and holes (h + ) on the photocatalysis mechanism for the degradation of organic pollutants were discussed in detail.

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Carrier recombination in Cu doped CdS thin films: Photocurrent and optical studies

Cited by 43 publications

References 21 publications

Fabrication of an Fe‐Doped SrTiO₃ Photocatalyst with Enhanced Dinitrogen Photofixation Performance

Fabrication of an Fe‐Doped SrTiO₃ Photocatalyst with Enhanced Dinitrogen Photofixation Performance

Photocatalytic Activities of Copper Doped Cadmium Sulfide Microspheres Prepared by a Facile Ultrasonic Spray-Pyrolysis Method

Rapid and morphology controlled synthesis of anionic S-doped TiO₂ photocatalysts for the visible-light-driven photodegradation of organic pollutants

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Carrier recombination in Cu doped CdS thin films: Photocurrent and optical studies

Cited by 43 publications

References 21 publications

Fabrication of an Fe‐Doped SrTiO3 Photocatalyst with Enhanced Dinitrogen Photofixation Performance

Fabrication of an Fe‐Doped SrTiO3 Photocatalyst with Enhanced Dinitrogen Photofixation Performance

Photocatalytic Activities of Copper Doped Cadmium Sulfide Microspheres Prepared by a Facile Ultrasonic Spray-Pyrolysis Method

Rapid and morphology controlled synthesis of anionic S-doped TiO2 photocatalysts for the visible-light-driven photodegradation of organic pollutants

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Product

Resources

About

Fabrication of an Fe‐Doped SrTiO₃ Photocatalyst with Enhanced Dinitrogen Photofixation Performance

Fabrication of an Fe‐Doped SrTiO₃ Photocatalyst with Enhanced Dinitrogen Photofixation Performance

Rapid and morphology controlled synthesis of anionic S-doped TiO₂ photocatalysts for the visible-light-driven photodegradation of organic pollutants