Synthesis and growth mechanism of dendritic Cu2−xSe microstructures

Filippo, Emanuela; Manno, D.; Serra, A.

doi:10.1016/j.jallcom.2012.05.111

Cited by 36 publications

(20 citation statements)

References 26 publications

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“…Figure shows the Raman spectra of the CuSe nanoflakes and the Cu 2− x Se columnar superstructures. Both curves show a resonance peak at 259 cm −1 attributed to the Se–Se stretching mode (A 1g mode), which is in good agreement with the previous report . This result reveals the existence of Se–Se bonds (Se 2 unit) in both hexagonal CuSe and fcc Cu 2− x Se …”

Section: Resultssupporting

confidence: 92%

“…Both curves show a resonance peak at 259 cm −1 attributed to the Se-Se stretching mode (A 1g mode), which is in good agreement with the previous report. [ 44,45 ] This result reveals the existence of Se-Se bonds (Se 2 unit) in both hexagonal CuSe and fcc Cu 2− x Se. [ 45 ] Composition engineering in copper chalcogenides is important for tuning their optical and optoelectronic properties.…”

Section: Resultsmentioning

confidence: 72%

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Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu_2−xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications

Yang

Kang

et al. 2015

Part. Part. Syst. Charact.

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In this work, a facile and low‐temperature water evaporation approach to prepare columnar superstructures consisting of face centered cubic (fcc) Cu2−xSe nanoflakes stacked along 〈111〉 direction is reported. Formation of such unique stacked nanoflake assemblies is resulted from oriented attachment of isolated hexagonal CuSe nanoflakes along the 〈001〉 direction with a ripening effect driven by solvent evaporation, and then followed by a phase conversion into fcc Cu2−xSe. Evolution from hexagonal CuSe nanoflakes to fcc Cu2−xSe columnar superstructures results in obvious red‐shift of band‐gap absorption edge from 670 to 786 nm and dramatically decreased Raman resonance band intensity of the Se–Se stretching mode at 259 cm−1 due to the phase conversion and composition variation. Remarkably, the Cu2−xSe columnar superstructures are employed as low‐cost and highly efficient counter electrodes (CEs) in quantum dot sensitized solar cells, exhibiting excellent electrocatalytic activity for polysulfide electrolyte regeneration. A ZnSe/CdSe cosensitized solar cell using the Cu2−xSe CE shows a significant increase in fill factor and short‐current density (JSC) and yields a 128% enhancement in power conversion efficiency as compared to the traditional noble metal Pt CE.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 72%

Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu_2−xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications

Yang

Kang

et al. 2015

Part. Part. Syst. Charact.

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“…[14] To obtain the morphologyi nformation of synthetic Cu 2Àx Se, field-emission scanning electron microscopy (FESEM)a nd transmission electron microscopy (TEM) tests were done. Therea re several observed diffraction lines at 26.7, 44.6, and 52.98,w hich match well with the (111), (220), and( 311) planes of cubic Cu 2Àx Se (JCPDS No.…”

Section: Resultsmentioning

confidence: 99%

“…The strong and sharp band at 257 cm À1 is supposed to be owed to the SeÀSe stretch vibra-tion, whereas the band at 512 cm À1 probably corresponds to the first overtone of the strong band. [14] To obtain the morphologyi nformation of synthetic Cu 2Àx Se, field-emission scanning electron microscopy (FESEM)a nd transmission electron microscopy (TEM) tests were done. Figure 2a shows the low-magnification SEM image of Cu 2Àx Se rods, the diameter of Cu 2Àx Se rods is about 300-800 nm, whereas the length can extendu pt ot ens of micrometers.…”

Section: Synthesis Of Rod-like Cu 2àx Sementioning

confidence: 99%

Facile Synthesis of Rod‐like Cu_2−xSe and Insight into its Improved Lithium‐Storage Property

Jiang

Wang

et al. 2017

ChemSusChem

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A rod-like Cu Se is synthesized by a facile water evaporation process. The electrochemical reaction mechanism is investigated by ex situ X-ray diffraction (XRD). By adopting an ether-based electrolyte instead of a carbonate-based electrolyte, the electrochemical performance of Cu Se electrodes improved significantly. The Cu Se electrodes exhibit outstanding cycle performance: after 1000 cycles, 160 mA h g can be maintained with a retention of 80.3 %. At current densities of 100, 200, 500, and 1000 mA g , the capacity of a Cu Se/Li battery was 208, 202, 200, and 198 mA h g , respectively, showing excellent rate capability. The 4-probe conductivity measurements along with electrochemical impendence spectroscopy (EIS) and cyclic voltammetry (CV) tests illustrate that the Cu Se electrodes display high specific conductivity and impressive lithium-ion diffusion rate, which makes the Cu Se a promising anode material for lithium-ion batteries.

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“…In good agreement with previous reports, the most intense resonance peak is observed at around 260 cm -1 for both samples, corresponding to the Se-Se stretch vibration. 21,50 For the films composed of the ternary Cu2SeyS1-y NCs, two additional peaks are observed, one at 450 cm -1 corresponding to the S-S stretching mode, and another peak at 368 cm -1 due to the S-Se stretching mode. 51 Consistent with the EDX data, the intensity of the Se-Se band is much stronger than that of the S-S and S-Se stretching vibration, suggesting that the alloy is rich in selenium.…”

Section: Resultsmentioning

confidence: 99%

Dye-Sensitized Ternary Copper Chalcogenide Nanocrystals: Optoelectronic Properties, Air Stability, and Photosensitivity

Maiti

Khan

et al. 2019

Chem. Mater.

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We report on the effect of ligand exchange of Cu2SeyS1-y as well as Cu2Se nanocrystals (NCs) with the organic π-system Cobalt β-tetraaminophthalocyanine (CoTAPc) and analyse changes in the structural, optical as well as electric properties of thin films of these hybrid materials. A strong ligand interaction with the surface of the NCs is revealed by UV/vis absorption and Raman spectroscopy. Grazingincidence small-angle X-ray scattering studies show a significant contraction in the interparticle distance upon ligand exchange. For copper-deficient Cu2-xSe, this contraction has a negligible effect on electric transport, while for copper-deficient Cu2-xSeyS1-y, the conductivity increases by eight orders of magnitude and results in metal-like temperature-dependent transport. We discuss these differences in the light of varying contributions of electronic vs. ionic transport in the two materials and highlight their effect on the stability of the transport properties under ambient conditions. With photocurrent measurements, we demonstrate high optical responsivities of 200-400 A/W for CoTAPc-capped Cu2SeyS1-y and emphasize the beneficial role of the organic π-system in this respect, which acts as an electronic linker and an optical sensitizer at the same time.

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Synthesis and growth mechanism of dendritic Cu2−xSe microstructures

Cited by 36 publications

References 26 publications

Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu_2−xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications

Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu_2−xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications

Facile Synthesis of Rod‐like Cu_2−xSe and Insight into its Improved Lithium‐Storage Property

Dye-Sensitized Ternary Copper Chalcogenide Nanocrystals: Optoelectronic Properties, Air Stability, and Photosensitivity

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Synthesis and growth mechanism of dendritic Cu2−xSe microstructures

Cited by 36 publications

References 26 publications

Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu2−xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications

Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu2−xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications

Facile Synthesis of Rod‐like Cu2−xSe and Insight into its Improved Lithium‐Storage Property

Dye-Sensitized Ternary Copper Chalcogenide Nanocrystals: Optoelectronic Properties, Air Stability, and Photosensitivity

Contact Info

Product

Resources

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Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu_2−xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications

Water Evaporation Induced Conversion of CuSe Nanoflakes to Cu_2−xSe Hierarchical Columnar Superstructures for High-Performance Solar Cell Applications

Facile Synthesis of Rod‐like Cu_2−xSe and Insight into its Improved Lithium‐Storage Property