The Cu-S (Copper-Sulfur) system

Chakrabarti, Debalay; Laughlin, David E.

doi:10.1007/bf02868665

Cited by 272 publications

(250 citation statements)

References 45 publications

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“…From XRD sulfurization experiments of pure Cu layers it is known that the hexagonal CuS transforms into the cubic Cu 2 S. 14 However this phase appears to have a too low Raman scattering cross section as it is not observed in our experiments. Based on the phase diagram 21 the transformation CuS→Cu 2 S should appear at approximately 507°C. But as indicated by the vanishing of the CuS phase, it is likely that here the transformation occurs at a lower temperature ͑Ϸ200°C͒.…”

Section: Discussionmentioning

confidence: 99%

Quasi real-time Raman studies on the growth of Cu–In–S thin films

Rudigier

Barcones

Luck

et al. 2004

Journal of Applied Physics

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In this work annealing and growth of CuInS 2 thin films is investigated with quasireal-time in situ Raman spectroscopy. During the annealing a shift of the Raman A 1 mode towards lower wave numbers with increasing temperature is observed. A linear temperature dependence of the phonon branch of Ϫ2 cm Ϫ1 /100 K is evaluated. The investigation of the growth process ͑sulfurization of metallic precursors͒ with high surface sensitivity reveals the occurrence of phases which are not detected with bulk sensitive methods. This allows a detailed insight in the formation of the CuInS 2 phases. Independent from stoichiometry and doping of the starting precursors the CuAu ordering of CuInS 2 initially forms as the dominating ordering. The transformation of the CuAu ordering into the chalcopyrite one is, in contrast, strongly dependent on the precursor composition and requires high temperatures.

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Section: Discussionmentioning

confidence: 99%

Quasi real-time Raman studies on the growth of Cu–In–S thin films

Rudigier

Barcones

Luck

et al. 2004

Journal of Applied Physics

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“…The structure was solved by intrinsic phasing resulting in the hexagonal structure with space group P63/mmc, which is the same as the intermediate temperature phase of Cu2S and the room temperature phases of Cu2Se1-xSx and Cu2S1-xTex solid solutions [9,[23][24][25]. As depicted in Figure 1a, the hexagonal unit cell of Cu2S1/3Se1/3Te1/3 contains two Cu2S1/3Se1/3Te1/3 formula units with cell parameters a = 4.052 ( …”

Section: Crystal Structurementioning

confidence: 99%

High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures

et al. 2017

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Mosaic-crystal microstructure is one of the optimal strategies for decoupling and balancing thermal and electrical transport properties in thermoelectric materials. Herein, we successfully achieve the desired nanoscale mosaic structures in triple-component Cu2-yS1/3Se1/3Te1/3 solid solutions using Cu2S, Cu2Se, and Cu2Te matrix compounds. They are solved in hexagonal structures with space group R3 ̅ m by means of single crystal structural solution and Rietveld refinement. Electron backscatter diffraction measurements show that all the samples are polycrystalline compounds with the grain size in the range of micrometers. However, transmission electron microscopic study reveals that these microscale grains are quasi-single crystals consist of a variety of 10-30 nm mosaic grains. Each mosaic grain is a perfect crystal but titled or rotated with respect to others by a very small angle. In this case, excellent electrical transports are maintained but exceptional low thermal conductivity is achieved throughout the whole temperature range, which is attributed to the combined phonon scatterings by point defects, liquid-like copper ions, and lattice strains or interfaces of mosaic nanograins. Combining all these favorable factors, remarkably high thermoelectric performance is achieved in Cu1.98S1/3Se1/3Te1/3 2 with a maximum zT of 1.9 at 1000 K.

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“…The next examples are binary systems: digenite Cu 1.8 S and chalcocite Cu 2−δ S. There are two polymorphs for Cu 1.8 S with the transition at 345 K. 24 The higher-temperature phase (Dg) in a face centered cubic structure (Fig. 1) is stable, whereas the lower-temperature one (αDg) in a rhombohedral structure was reported to be metastable.…”

Section: B Digenite and Chalcocite (P-type)mentioning

confidence: 99%

“…1) is stable, whereas the lower-temperature one (αDg) in a rhombohedral structure was reported to be metastable. The stoichiometric Cu 2 S, on the other hand, has three polymorphs: cubic phase (Dg) at T ≥ 708 K, hexagonal one ( βCh) at T = 376-708 K, and monoclinic one (αCh) at T ≤ 376 K. 24 In the Dg phases of Cu 1.8 S and Cu 2 S, the sulfur atoms maintain a rigid sublattice, while the Cu ions are distributed at many possible positions. 25 It has been indicated that the Dg phase is a superionic phase having liquid-like mobile copper ions.…”

Section: B Digenite and Chalcocite (P-type)mentioning

confidence: 99%

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

2016

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Synthetic minerals and related systems based on Cu–S are attractive thermoelectric (TE) materials because of their environmentally benign characters and high figures of merit at around 700 K. This overview features the current examples including kesterite, binary copper sulfides, tetrahedrite, colusite, and chalcopyrite, with emphasis on their crystal structures and TE properties. This survey highlights the superior electronic properties in the p-type materials as well as the close relationship between crystal structures and thermophysical properties. We discuss the mechanisms of high power factor and low lattice thermal conductivity, approaching higher TE performances for the Cu–S based materials.

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The Cu-S (Copper-Sulfur) system

Cited by 272 publications

References 45 publications

Quasi real-time Raman studies on the growth of Cu–In–S thin films

Quasi real-time Raman studies on the growth of Cu–In–S thin films

High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

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