Cuprous selenide nano-crystal synthesis and characterization

Hsiang, Hsing I.; Hsu, Wei Hsiang; Lu, Li Hsin; Chang, Ya‐Chi; Yen, Fu‐Su

doi:10.1016/j.materresbull.2012.11.020

Cited by 13 publications

(6 citation statements)

References 34 publications

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“…As seen in Figure 5 b,c and Figure 5 e,f, Cu 1.8 Se has smaller grains after the SPS process as compared to Cu 2 Se. The difference in grain size is inherited from as-made materials, where higher pressure (see Figure S1a ) and temperature during the synthesis of Cu 2 Se resulted in larger particles, as proposed by Hssiang et al [ 53 ]. Grains in Cu 1.8 Se might show more resistance and remain identical during the SPS process, not only due to small (with high surface energy) particles but also due to relatively good thermal stability due to copper deficiency.…”

Section: Resultsmentioning

confidence: 76%

Composition Tuning of Nanostructured Binary Copper Selenides through Rapid Chemical Synthesis and Their Thermoelectric Property Evaluation

et al. 2020

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Reduced energy consumption and environmentally friendly, abundant constituents are gaining more attention for the synthesis of energy materials. A rapid, highly scalable, and process-temperature-sensitive solution synthesis route is demonstrated for the fabrication of thermoelectric (TE) Cu2−xSe. The process relies on readily available precursors and microwave-assisted thermolysis, which is sensitive to reaction conditions; yielding Cu1.8Se at 200 °C and Cu2Se at 250 °C within 6–8 min reaction time. Transmission electron microscopy (TEM) revealed crystalline nature of as-made particles with irregular truncated morphology, which exhibit a high phase purity as identified by X-ray powder diffraction (XRPD) analysis. Temperature-dependent transport properties were characterized via electrical conductivity, Seebeck coefficient, and thermal diffusivity measurements. Subsequent to spark plasma sintering, pure Cu1.8Se exhibited highly compacted and oriented grains that were similar in size in comparison to Cu2Se, which led to its high electrical and low thermal conductivity, reaching a very high power-factor (24 µW/K−2cm−1). Density-of-states (DOS) calculations confirm the observed trends in electronic properties of the material, where Cu-deficient phase exhibits metallic character. The TE figure of merit (ZT) was estimated for the materials, demonstrating an unprecedentedly high ZT at 875 K of 2.1 for Cu1.8Se sample, followed by 1.9 for Cu2Se. Synthetic and processing methods presented in this work enable large-scale production of TE materials and components for niche applications.

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Section: Resultsmentioning

confidence: 76%

Composition Tuning of Nanostructured Binary Copper Selenides through Rapid Chemical Synthesis and Their Thermoelectric Property Evaluation

et al. 2020

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“…The OLA can effectively promote the reduction of Cu 2+ into Cu + at higher temperatures. Therefore, as the reaction temperature was increased to 260°C, the Cu 2− x Se phase was formed by the Cu + reaction with Se 2‐ in the solution . Figure (b) shows a SEM image of Cu 2− x Se crystallites, suggesting that the agglomerates are made of irregular shaped Cu 2− x Se crystallites with a particle size of about 1–2 μm.…”

Section: Resultsmentioning

confidence: 98%

“…In addition, the pure Cu 2− x Se phase was observed at 260°C of reaction temperature using the heating‐up process. The Cu 2− x Se formation mechanism was investigated in our previous study . At lower temperatures, Cu + and Cu 2+ ions reacted with OLA to form the Cu‐OLA complex and the Se 2− ions slowly dissolved in ODE.…”

Section: Resultsmentioning

confidence: 99%

“…The Cu 2Àx Se formation mechanism was investigated in our previous study. 26 At lower temperatures, Cu + and Cu 2+ ions reacted with OLA to form the Cu-OLA complex and the Se 2À ions slowly dissolved in ODE. The CuSe precipitates are formed by the reaction of Cu(OLA) 2+ with Se 2À .…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, as the reaction temperature was increased to 260°C, the Cu 2Àx Se phase was formed by the Cu + reaction with Se 2in the solution. 26 Figure 2(b) shows a SEM image of Cu 2Àx Se crystallites, suggesting that the agglomerates are made of irregular shaped Cu 2Àx Se crystallites with a particle size of about 1-2 lm. The copper-poor Cu 2Àx Se particle chemical composition is close to that of Cu:Se = 1.78:1 based on the XRF result (Table I).…”

Section: Methodsmentioning

confidence: 99%

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CuInSe₂ Formation from CuSe/In₂Se₃ and Cu₂Se/In₂Se₃ Powders: Reaction Kinetics and Mechanisms

et al. 2014

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CuInSe2 (CIS) powders were synthesized using CuSe, Cu2Se, and In2Se3 as the raw materials. The formation mechanisms and reaction kinetics from CuSe/In2Se3 and Cu2Se/In2Se3 powders in a selenium atmosphere were investigated. It was observed that the formation temperature of α‐CIS powders synthesized using Cu2Se/In2Se3 as the raw materials was higher than that using CuSe/In2Se3. Both reactions for Cu2Se/In2Se3 and CuSe/In2Se3 mixtures follow one‐dimensional diffusion‐controlled reactions with apparent activation energies of 124.3 and 73.2 kJ/mol, respectively. For both mixtures the indium‐rich β‐CIS phase resulting from Cu+ ion diffusion toward the In2Se3 phase was observed. The particle size and morphology of the newly formed CIS was similar to In2Se3, which indicated that the CIS formation kinetics may be dominated by the diffusion of Cu+ ions. The Cu–Se liquid phase resulting from the peritectic decomposition of CuSe2 and CuSe at a relatively low temperature may promote Cu+ diffusion into the In2Se3 surface, assisting CIS formation.

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Advantageous mechanochemical synthesis of copper(I) selenide semiconductor, characterization, and properties

Gáborová

Achimovičová

Hegedüs

et al. 2021

Front. Chem. Sci. Eng.

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Cuprous selenide nano-crystal synthesis and characterization

Cited by 13 publications

References 34 publications

Composition Tuning of Nanostructured Binary Copper Selenides through Rapid Chemical Synthesis and Their Thermoelectric Property Evaluation

Composition Tuning of Nanostructured Binary Copper Selenides through Rapid Chemical Synthesis and Their Thermoelectric Property Evaluation

CuInSe₂ Formation from CuSe/In₂Se₃ and Cu₂Se/In₂Se₃ Powders: Reaction Kinetics and Mechanisms

Advantageous mechanochemical synthesis of copper(I) selenide semiconductor, characterization, and properties

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Cuprous selenide nano-crystal synthesis and characterization

Cited by 13 publications

References 34 publications

Composition Tuning of Nanostructured Binary Copper Selenides through Rapid Chemical Synthesis and Their Thermoelectric Property Evaluation

Composition Tuning of Nanostructured Binary Copper Selenides through Rapid Chemical Synthesis and Their Thermoelectric Property Evaluation

CuInSe2 Formation from CuSe/In2Se3 and Cu2Se/In2Se3 Powders: Reaction Kinetics and Mechanisms

Advantageous mechanochemical synthesis of copper(I) selenide semiconductor, characterization, and properties

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CuInSe₂ Formation from CuSe/In₂Se₃ and Cu₂Se/In₂Se₃ Powders: Reaction Kinetics and Mechanisms