Wurtzite−Chalcopyrite Polytypism in CuInS<sub>2</sub> Nanodisks

Koo, Bonil; Patel, Reken N.; Korgel, Brian A.

doi:10.1021/cm900363w

Cited by 133 publications

(145 citation statements)

References 35 publications

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“…Compared to the values for the bulk materials (1.04 eV for CuInSe 2 [35] and 1.53 eV for CuInS 2 [36]) the band gap of our CuInSSe NPs is blue-shifted due to the quantum confinement effect.…”

Section: Semiconductor Cuinsse Nanoparticlescontrasting

confidence: 59%

Selective Growth of Gold onto Copper Indium Sulfide Selenide Nanoparticles

Witt¹,

Parisi²,

Kolny‐Olesiak³

2013

Zeitschrift Für Naturforschung A

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Hybrid nanostructures are interesting materials for numerous applications in chemistry, physics, and biology, due to their novel properties and multiple functionalities. Here, we present a synthesis of metal-semiconductor hybrid nanostructures composed of nontoxic I-III-VI semiconductor nanoparticles and gold. Copper indium sulfide selenide (CuInSSe) nanocrystals with zinc blende structure and trigonal pyramidal shape, capped with dodecanethiol, serve as an original semiconductor part of a new hybrid nanostructure. Metallic gold nanocrystals selectively grow onto vertexes of these CuInSSe pyramids. The hybrid nanostructures were studied by transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, and UV-Vis-absorption spectroscopy, which allowed us conclusions about their growth mechanism. Hybrid nanocrystals are generated by replacement of a sacrificial domain in the CuInSSe part. At the same time, small selenium nanocrystals form that stay attached to the remaining CuInSSe/Au particles. Additionally, we compare the synthesis and properties of CuInSSe-based hybrid nanostructures with those of copper indium disulfide (CuInS 2 ). CuInS 2 /Au nanostructures grow by a different mechanism (surface growth) and do not show any selectivity.

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Section: Semiconductor Cuinsse Nanoparticlescontrasting

confidence: 59%

Selective Growth of Gold onto Copper Indium Sulfide Selenide Nanoparticles

Witt¹,

Parisi²,

Kolny‐Olesiak³

2013

Zeitschrift Für Naturforschung A

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“…The above changes in the diffraction patterns implied that the resulted phases of the synthesized NCs underwent a conversion from wurtzite to stannite structure. 28 Similarly, Korgel and colleagues 31 has revealed polytypism in the nanodisks, with the wurtzite phase interfaced with significant chalcopyrite domains in CuInS 2 NCs. On the other hand, when the oleylamine in the mixed solvent was replaced by oleic acid, the synthesized CZTSe NC exhibited pure stannite as shown in Figure 1a (pattern 4).…”

Section: Resultsmentioning

confidence: 94%

Wurtzite Cu2ZnSnSe4 nanocrystals for high-performance organic–inorganic hybrid photodetectors

2012

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Indium-free quaternary chalcogenide, Cu 2 ZnSnSe 4 (CZTSe), has driven much attention for its potential application in photovoltaics and optoelectronics. It is well known that the composition and structure of nanocrystals (NCs) significantly affect their optical and electrical properties. Controllable synthesis of materials with new crystal structures, especially metastable structures, has given impetus to the development of nanomaterials with many new exciting properties and applications. Highquality CZTSe NCs with thermodynamically metastable wurtzite phase and optical band gap of 1.46 eV were herein synthesized via a facile, lost-cost and safe-solution method. The formation mechanism of the wurtzite CZTSe NCs was investigated in detail, which indicates high reaction rate and low surface energy are favorable for the formation of wurtzite structure. The promising application of as-synthesized NCs in photovoltaics and optoelectronics has been demonstrated by the high-performance hybrid photodetector made from CZTSe NCs and P3HT, with an on/off ratio larger than 150.

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“…Nanoparticles of CuInS 2 were synthesized by a solution-phase colloidal synthesis at 245°C 11 . Characterisation by TEM, XRD and UV-vis absorption spectrum analysis were performed.…”

Section: Resultsmentioning

confidence: 99%

Interlaced crystals having a perfect Bravais lattice and complex chemical order revealed by real-space crystallography

et al. 2014

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The search for optimal thermoelectric materials aims for structures in which the crystalline order is disrupted to lower the thermal conductivity without degradation of the electron conductivity. Here we report the synthesis and characterisation of ternary nanoparticles (two cations and one anion) that exhibit a new form of crystalline order: an uninterrupted, perfect, global Bravais lattice, in which the two cations exhibit a wide array of distinct ordering patterns within the cation sublattice, forming interlaced domains and phases. Partitioning into domains and phases is not unique; the corresponding boundaries have no structural defects or strain and entail no energy cost. We call this form of crystalline order 'interlaced crystals' and present the example of hexagonal CuInS 2 . Interlacing is possible in multi-cation tetrahedrally bonded compound with an average of two electrons per bond. Interlacing has minimal effect on electronic properties, but should strongly reduce phonon transport, making interlaced crystals attractive for thermoelectric applications.

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Wurtzite−Chalcopyrite Polytypism in CuInS₂ Nanodisks

Cited by 133 publications

References 35 publications

Selective Growth of Gold onto Copper Indium Sulfide Selenide Nanoparticles

Selective Growth of Gold onto Copper Indium Sulfide Selenide Nanoparticles

Wurtzite Cu2ZnSnSe4 nanocrystals for high-performance organic–inorganic hybrid photodetectors

Interlaced crystals having a perfect Bravais lattice and complex chemical order revealed by real-space crystallography

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Wurtzite−Chalcopyrite Polytypism in CuInS2 Nanodisks

Cited by 133 publications

References 35 publications

Selective Growth of Gold onto Copper Indium Sulfide Selenide Nanoparticles

Selective Growth of Gold onto Copper Indium Sulfide Selenide Nanoparticles

Wurtzite Cu2ZnSnSe4 nanocrystals for high-performance organic–inorganic hybrid photodetectors

Interlaced crystals having a perfect Bravais lattice and complex chemical order revealed by real-space crystallography

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Wurtzite−Chalcopyrite Polytypism in CuInS₂ Nanodisks