Structural, morphological and optical properties of sprayed nanocrystalline thin films of Cd1-xZnxS solid solution

Verma, U. P.; Thakur, Vikas; Rajaram, P.; Shrivastava, A. K.

doi:10.1007/s13391-014-4064-z

Cited by 15 publications

(2 citation statements)

References 34 publications

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“…Thus, to obtain a stable and efficient photocatalyst, synthesis of ternary chalcogenide Cd 1– x Zn x S solid solution − has attracted increasing attention in the field of photocatalytic hydrogen generation. The appropriate band gap of Cd 1– x Zn x S can be adjusted from a small band gap of 2.4 eV (CdS) to a large band gap of 3.7 eV (ZnS) by changing its composition. − Photostability and photocatalytic activity of Cd 1– x Zn x S can be improved to some extent. However, similar to CdS, pure Cd 1– x Zn x S tends to form a photocorrosion layer and the aggregation of large particles, resulting in unstable structures and a high electron–hole (e – /h + ) recombination rate.…”

Section: Introductionmentioning

confidence: 99%

Acid-Exfoliated Metallic Co_0.85Se Nanosheets as Cocatalyst on Cd_0.5Zn_0.5S for Photocatalytic Hydrogen Evolution under Visible-Light Irradiation

2019

ACS Sustainable Chem. Eng.

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Co 0.85 Se, nonstoichiometric phase, as an excellent electrocatalytic activity, was used as a cocatalyst to modify Cd 0.5 Zn 0.5 S nano-photocatalyst. The Co 0.85 Se (1.5 wt %)/Cd 0.5 Zn 0.5 S Schottky junction shows the greatest activity for H 2 generation (759.3 μmol h −1 ), which is 2.1 times that of bare Cd 0.5 Zn 0.5 S (350.6 μmol h −1 ). It turns out that Co 0.85 Se nanoplates can be exfoliated into nanosheets by diluted hydrochloric acid. It is noted that exfoliated metallic Co 0.85 Se nanosheets show a little better hydrogen evolution reaction property and a smaller charge-transfer resistance than those of Co 0.85 Se nanoplates, implying that exfoliated Co 0.85 Se nanosheets have more active sites and higher electrical conductivity. The distinct properties of exfoliated metallic Co 0.85 Se nanosheets enhance the efficient spatial separation of photoinduced charged particle carriers and result in an excellent enhancement in the photoelectric current and photocatalytic hydrogen evolution performance of Cd 0.5 Zn 0.5 S. The amount of Co 0.85 Se in the heterojunction has an obvious effect on the hydrogen evolution property. The consequences show that 1.5 wt % exfoliated Co 0.85 Se nanosheets added into the Cd 0.5 Zn 0.5 S sample result in the maximum water splitting rate of 759.3 μmol h −1 . For other semiconductor photocatalyst systems, our work demonstrates that introducing exfoliated metallic Co 0.85 Se nanosheets electrocatalyst as an efficient cocatalyst to improve photocatalytic capacity without noble metals is feasible.

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Section: Introductionmentioning

confidence: 99%

Acid-Exfoliated Metallic Co_0.85Se Nanosheets as Cocatalyst on Cd_0.5Zn_0.5S for Photocatalytic Hydrogen Evolution under Visible-Light Irradiation

2019

ACS Sustainable Chem. Eng.

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“…The sub-spectrum with a higher wavenumber is due to the 1LO phonon mode, and the sub-spectrum with a lower wavenumber is due to the 2LO phonon mode. 33,34 The Raman shift of the sub-spectrum of the 1LO mode is measured to be 299.5, 300.5, 300.4, and 299.9 cm −1 for Zn x Cd 1 − x S thin films with x = 0, 0.14, 0.26, and 0.32, respectively. The Raman shift wavenumber increases as x increases from 0 to 0.14 and then decreases as the x increases from 0.14 to 0.32.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Doping Behavior of Zn in CdS and Its Effect on the Power Conversion Efficiency of the Cu₂ZnSn(S, Se)₄ Solar Cell

Zhang

Wang

et al. 2021

J. Phys. Chem. C

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High carrier recombination at the Cu2ZnSn (S, Se)4(CZTSSe)/CdS interface is the critical issue that results in the low power conversion efficiency (PCE) of CZTSSe solar cells. To reduce the recombination by optimizing the CZTSSe/CdS interfacial structure, we fabricated a Zn doped CdS (Zn x Cd1 – x S) thin film with x of 0–0.32 and a CZTSSe solar cell with the Zn x Cd1 – x S as the buffer layer. It is found that Zn substitutes for Cd in the x range of 0–0.26 and that some of the Zn substitutes for Cd and another Zn locates in the interstitial site of the CdS lattice in the x range of 0.26–0.32, which make the lattice mismatch between CZTSSe and Zn x Cd1 – x S decrease in x of 0–0.26 and increase in x of 0.26–0.32. The conduction band offset at the CZTSSe/Zn x Cd1 – x S interface is demonstrated by XPS to be a positive ″spike″-like type and increases from 0.11 to 0.43 eV as x increases from 0 to 0.32. PCE is increased from 5.00 to 7.73% by optimizing x. The increased PCE is attributed to increased open-circuit voltage (V OC) and filling factor (FF), while the decreased PCE is due to decreased V OC, FF, and J SC. By using quantitative analysis methods, the increased V OC and FF are mainly attributed to the increased shunt resistance (R sh) and decreased reverse saturation current density (J 0), and the decreased short-circuit current density (J SC) is attributed to the increased conduction band offset (CBO). The influence mechanism of Zn doping on R sh, J 0, and CBO is discussed.

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Multi-photon Raman scattering and yellow–green-light emission from feather-like Cd1–xZnxS nanostructures

Yang

Zhang

2019

Appl. Phys. A

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Structural, morphological and optical properties of sprayed nanocrystalline thin films of Cd1-xZnxS solid solution

Cited by 15 publications

References 34 publications

Acid-Exfoliated Metallic Co_0.85Se Nanosheets as Cocatalyst on Cd_0.5Zn_0.5S for Photocatalytic Hydrogen Evolution under Visible-Light Irradiation

Acid-Exfoliated Metallic Co_0.85Se Nanosheets as Cocatalyst on Cd_0.5Zn_0.5S for Photocatalytic Hydrogen Evolution under Visible-Light Irradiation

Doping Behavior of Zn in CdS and Its Effect on the Power Conversion Efficiency of the Cu₂ZnSn(S, Se)₄ Solar Cell

Multi-photon Raman scattering and yellow–green-light emission from feather-like Cd1–xZnxS nanostructures

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Structural, morphological and optical properties of sprayed nanocrystalline thin films of Cd1-xZnxS solid solution

Cited by 15 publications

References 34 publications

Acid-Exfoliated Metallic Co0.85Se Nanosheets as Cocatalyst on Cd0.5Zn0.5S for Photocatalytic Hydrogen Evolution under Visible-Light Irradiation

Acid-Exfoliated Metallic Co0.85Se Nanosheets as Cocatalyst on Cd0.5Zn0.5S for Photocatalytic Hydrogen Evolution under Visible-Light Irradiation

Doping Behavior of Zn in CdS and Its Effect on the Power Conversion Efficiency of the Cu2ZnSn(S, Se)4 Solar Cell

Multi-photon Raman scattering and yellow–green-light emission from feather-like Cd1–xZnxS nanostructures

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Acid-Exfoliated Metallic Co_0.85Se Nanosheets as Cocatalyst on Cd_0.5Zn_0.5S for Photocatalytic Hydrogen Evolution under Visible-Light Irradiation

Acid-Exfoliated Metallic Co_0.85Se Nanosheets as Cocatalyst on Cd_0.5Zn_0.5S for Photocatalytic Hydrogen Evolution under Visible-Light Irradiation

Doping Behavior of Zn in CdS and Its Effect on the Power Conversion Efficiency of the Cu₂ZnSn(S, Se)₄ Solar Cell