Synthesis and characterization of CuInS2 nanocrystals prepared by solvothermal/molten salt method

Benchikhi, Mohamed; Ouatib, Rachida El; Er-Rakho, Lahcen; Durand, Bernard

doi:10.1016/j.ceramint.2016.04.048

Cited by 11 publications

(9 citation statements)

References 31 publications

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“…In Figure 3 b, an exemplary Tauc plot for film_24 h is shown. The smallest band gap of 1.44 eV is observed for film_48 h and the largest one with a value of 1.55 eV for film_3 h. All these values are close to the reported band gaps for CuInS 2 bulk material and nanostructures [ 21 , 46 ]. Variations in the band gap values can also be affected by the chemical composition, the film thickness and structure, as well as defects in the crystal structure, as mentioned above for the absorption behavior.…”

Section: Resultssupporting

confidence: 87%

“…The smallest band gap is found for film_S (1.47 eV) [ 32 ], while the largest one is given for a reaction temperature of 180 °C, with a value of 1.55 eV. All the other band gap values lay in between these values and are very close to band gaps reported in literature for CuInS 2 [ 21 , 46 ]. Again, variations in the band gap can be induced by the chemical composition, the film thickness, and structure, as mentioned already above.…”

Section: Resultssupporting

confidence: 75%

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Facile and Robust Solvothermal Synthesis of Nanocrystalline CuInS2 Thin Films

et al. 2018

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This work demonstrates that the solvothermal synthesis of nanocrystalline CuInS2 thin films using the amino acid l-cysteine as sulfur source is facile and robust against variation of reaction time and temperature. Synthesis was carried out in a reaction time range of 3–48 h (at 150 °C) and a reaction temperature range of 100–190 °C (for 18 h). It was found that at least a time of 6 h and a temperature of 140 °C is needed to produce pure nanocrystalline CuInS2 thin films as proven by X-ray and electron diffraction, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Using UV-vis spectroscopy, a good absorption behavior as well as direct band gaps between 1.46 and 1.55 eV have been determined for all grown films. Only for a reaction time of 3 h and temperatures below 140 °C CuInS2 is not formed. This is attributed to the formation of metal ion complexes with l-cysteine and the overall slow assembly of CuInS2. This study reveals that the reaction parameters can be chosen relatively free; the reaction is completely nontoxic and precursors and solvents are rather cheap, which makes this synthesis route interesting for industrial up scaling.

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Section: Resultssupporting

confidence: 87%

Section: Resultssupporting

confidence: 75%

Facile and Robust Solvothermal Synthesis of Nanocrystalline CuInS2 Thin Films

et al. 2018

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“…These values are close but lower than the ones mentioned in the literature for the bulk material as well as those reported for nanostructures. 1,36 The reason for our band gaps being smaller might be related to the small crystallite size and a corresponding large number of defects in the crystal structure, as well as to differences in composition. This will be discussed in more detail later.…”

Section: †)mentioning

confidence: 92%

A biomolecule-assisted, cost-efficient route for growing tunable CuInS₂ films for green energy application

et al. 2017

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CuInS 2 has become a popular and promising candidate as an absorber material in photovoltaic devices and photo-electrochemical cells. Here we report the successful L-cysteine-assisted growth of homogeneous, nanostructured CuInS 2 thin films deposited on fluorine-doped tin oxide coated glass. In contrast to existing synthesis routes using thioacetamide as a sulfur source, our method offers the advantage of being environmentally friendly and non-toxic. We found that L-cysteine is able to reduce the Cu 2+ ions of the precursor CuSO 4 to Cu + in aqueous solution, thus enabling the formation of CuInS 2 thin films. By varying the concentration of the reaction solution during the solvothermal synthesis route, we obtained CuInS 2 films with different thicknesses and compositions, investigated with the help of energy dispersive X-ray spectroscopy with scanning and transmission electron microscopy. X-ray and electron diffraction experiments of the films prove the synthesis of a pure CuInS 2 phase with the chalcopyrite structure except for the highest L-cysteine concentration where additional In 2 S 3 forms. UV-Vis absorption spectroscopy reveals absorption over the whole visible spectrum. The calculated band gap using the UV-Vis data ranges between 1.4 and 1.5 eV, and can be adjusted by changing crystal size and chemical composition. This offers a promising route towards tuning the optical and transport properties. First dye degradation experiments show promising activity under solar illumination.

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“…Neumann-Kopp 法则计算得到 [28] , 而样品的密度则根据阿基米德原理进行测量。 [35] 大于 CuInTe 2 (E g~1 .02 eV) [15] 的禁带宽度, 因此固溶 S 样品的禁带宽度比 CuInTe 2 有所增大。…”

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“…其中 uh和分别是无序尺度因子、平均原子体积、普朗克常数、平均声速以及实验上的无序散射因子。根据 Slack 的模型 [37] 以及 Abeles [38] 的假设, 散射因子 M + S , 这里 M 和 S 分别指的是质量场涨落散射因子和应力场涨落散射因子。质量场涨落散射因子可以根据下式得出 [36] : [31,35] :…”

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Thermoelectric Properties for CuInTe_2-_xS_x (x = 0, 0.05, 0.1, 0.15) Solid Solution

覃玉婷¹,

仇鹏飞²,

Shi³

et al. 2017

Journal of Inorganic Materials

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Synthesis and characterization of CuInS2 nanocrystals prepared by solvothermal/molten salt method

Cited by 11 publications

References 31 publications

Facile and Robust Solvothermal Synthesis of Nanocrystalline CuInS2 Thin Films

Facile and Robust Solvothermal Synthesis of Nanocrystalline CuInS2 Thin Films

A biomolecule-assisted, cost-efficient route for growing tunable CuInS₂ films for green energy application

Thermoelectric Properties for CuInTe_2-_xS_x (x = 0, 0.05, 0.1, 0.15) Solid Solution

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Synthesis and characterization of CuInS2 nanocrystals prepared by solvothermal/molten salt method

Cited by 11 publications

References 31 publications

Facile and Robust Solvothermal Synthesis of Nanocrystalline CuInS2 Thin Films

Facile and Robust Solvothermal Synthesis of Nanocrystalline CuInS2 Thin Films

A biomolecule-assisted, cost-efficient route for growing tunable CuInS2 films for green energy application

Thermoelectric Properties for CuInTe2-xSx (x = 0, 0.05, 0.1, 0.15) Solid Solution

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A biomolecule-assisted, cost-efficient route for growing tunable CuInS₂ films for green energy application

Thermoelectric Properties for CuInTe_2-_xS_x (x = 0, 0.05, 0.1, 0.15) Solid Solution