Hexagonal polytype of CuCrO2 nanocrystals obtained by hydrothermal method

Miclău, Marinela; Ursu, Daniel; Kumar, Sanjay; Grozescu, Ioan

doi:10.1007/s11051-012-1110-3

Cited by 27 publications

(22 citation statements)

References 16 publications

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“…Besides, In doping does not affect the phase of CuCrO 2 NPs. While it is challenging to obtain the pure 2H phase of CuCrO 2 as reported, the XRD patterns of In doped CuCrO 2 NPs show that no obvious 3R phase exists, implying that we have achieved dominantly pure 2H phase in the NPs, which corresponds to the peaks of 35.1°, 37.3°, 48.9°, 62.2°, and 66.1° . Transmission electron microscopy (TEM) image (Figure b and the inset) shows that the average size of In doped NPs is 12 nm, which is slightly larger than the previous reports with average size (10 nm) of CuCrO 2 NPs .…”

Section: Resultsmentioning

confidence: 67%

Multifunctional Synthesis Approach of In:CuCrO₂ Nanoparticles for Hole Transport Layer in High‐Performance Perovskite Solar Cells

Yang

Ouyang

Huang

et al. 2019

Adv Funct Materials

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While there are very limited studies of doped ternary metal oxide based hole transport materials, a multifunctional synthesis approach of In doped CuCrO 2 nanoparticles (NPs) as efficient hole transport layers (HTLs) including simplifying the synthesis requirements is proposed, enabling doping and achievement of treatment-free HTLs. Remarkably, compared with conventional methods for synthesizing CuCrO 2 NPs, the newly proposed azeotropic promoted approach dramatically reduces the reaction time by 90% and the calcination temperature by one-third, which not only promotes high throughput production but also reduces power consumption and cost in synthesis. Equally important, indium is successfully doped into CuCrO 2 , which is fundamentally difficult in low temperature processes. The In doping offers less d-d transition of Cr 3+ and p-type doping characteristics for improving HTL transmittance and conductivity, respectively. Interestingly, In doped CuCrO 2 HTL with these improvements can be achieved by a simple ambient-condition process and exhibits thermal stability up to 200 °C, which allows perovskite solar cells (PSCs) to achieve a power conversion efficiency of 20.54%. Meanwhile, the devices show good repeatability and photostability. Consequently, the work contributes to establishing a simple approach to realize pristine and doped multinary oxides based HTL for the development of practical and high performing PSCs.

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Section: Resultsmentioning

confidence: 67%

Multifunctional Synthesis Approach of In:CuCrO₂ Nanoparticles for Hole Transport Layer in High‐Performance Perovskite Solar Cells

Yang

Ouyang

Huang

et al. 2019

Adv Funct Materials

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“…Similar calculated sizes that range between 20 and 38 nm have been reported elsewhere for the HT CuCrO 2 samples with similar broadened XRPD peaks. 29,34,35 Despite the fact that SEM is incapable of resolving the small size of these crystallites, the TEM image suggests that we indeed obtain nanocrystalline grains in the as-prepared HT CuCrO 2 samples. Various samples were sintered at high temperature to form pellets for transport measurements.…”

Section: Particle Size and Morphologymentioning

confidence: 86%

“…The broad peaks indicate very small grains and the pattern is similar to those previously reported for hydrothermally synthesized CuCrO 2 . 29,31 Our assynthesised samples contained a mixture of 2H and 3R phases, as shown by the splitting of the 102 peak into a broad doublet in Fig. 2, which presents the XRPD patterns of samples synthesized using various Cu 2 O concentrations and temperatures.…”

Section: Characterizationmentioning

confidence: 96%

“…1b) and probably correspond to the metastable 2H structure. 29 However, the peak positions are not exactly in agreement with the previously reported hexagonal structure with space group P6 3 /mmc; 30 in our case it appears that the 2H phase undergoes a slight orthorhombic distortion to a unit cell with lattice parameters a 0 z a, b 0 z bO3, c 0 z c where a ¼ 2.9908(9)Å, b ¼ 5.277(2)Å, c ¼ 11.903(4)Å. This phase accounts for $5 mol% of the sample.…”

Section: Characterizationmentioning

confidence: 99%

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Crystallite size dependence of thermoelectric performance of CuCrO₂

2016

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“…The layered structure of CuCrO 2 contains natural superlattices consisting of alternate layers of edge-shared CrO 6 octahedral and dumbbell-shaped CuO 2 units. Delafossite CuCrO 2 is synthesized by solid-state [8][9][10], hydrothermal [11][12][13], self-combustion [14] and sol-gel [15] routes. Also, a microwave-assisted synthesis of delafossite CuCrO 2 was reported [16].…”

Section: Introductionmentioning

confidence: 99%

Sub-micron-sized delafossite CuCrO2 with different morphologies synthesized by nitrate–citric acid sol–gel route

Bolloju

Srinivasan

2017

Bull Mater Sci

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Currently, copper chromium oxide crystallizing in delafossite structure attracts huge research interest due to its versatile applications arising from its layered structure. In this work, delafossite CuCrO 2 was synthesized by sol-gel method from their respective hydrated nitrate salts with citric acid as a chelating agent. The phase formation temperature was found to be between 750 and 775 • C. At 750 • C, the partial formation of delafossite CuCrO 2 spheres with particle size in nano-regime was observed in the midst of platelets of spinel CuCr 2 O 4. A green coloured powder with particle size 125-350 nm exhibiting distorted spheres was obtained at 775 • C. The increase in temperature has a profound impact on the particle size, morphology and the optical properties of CuCrO 2. The X-ray powder diffraction studies revealed the formation of 3R-CuCrO 2 phase (rhombohedral, space group R-3m) as a major product in the temperature range 775-1000 • C. The unit cell parameters were found to be a = b = 2.9711 Å and c = 17.0723 Å at 1000 • C. Scanning electron micrographs illustrated the different morphologies from spheres to hexagonal form via distorted spheres and cubes. The UV-Vis diffuse reflectance spectra measured for the powders exhibited semiconductor characteristics with an interesting size-related and temperature-dependent bandgap.

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Hexagonal polytype of CuCrO2 nanocrystals obtained by hydrothermal method

Cited by 27 publications

References 16 publications

Multifunctional Synthesis Approach of In:CuCrO₂ Nanoparticles for Hole Transport Layer in High‐Performance Perovskite Solar Cells

Multifunctional Synthesis Approach of In:CuCrO₂ Nanoparticles for Hole Transport Layer in High‐Performance Perovskite Solar Cells

Crystallite size dependence of thermoelectric performance of CuCrO₂

Sub-micron-sized delafossite CuCrO2 with different morphologies synthesized by nitrate–citric acid sol–gel route

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Hexagonal polytype of CuCrO2 nanocrystals obtained by hydrothermal method

Cited by 27 publications

References 16 publications

Multifunctional Synthesis Approach of In:CuCrO2 Nanoparticles for Hole Transport Layer in High‐Performance Perovskite Solar Cells

Multifunctional Synthesis Approach of In:CuCrO2 Nanoparticles for Hole Transport Layer in High‐Performance Perovskite Solar Cells

Crystallite size dependence of thermoelectric performance of CuCrO2

Sub-micron-sized delafossite CuCrO2 with different morphologies synthesized by nitrate–citric acid sol–gel route

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Product

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Multifunctional Synthesis Approach of In:CuCrO₂ Nanoparticles for Hole Transport Layer in High‐Performance Perovskite Solar Cells

Multifunctional Synthesis Approach of In:CuCrO₂ Nanoparticles for Hole Transport Layer in High‐Performance Perovskite Solar Cells

Crystallite size dependence of thermoelectric performance of CuCrO₂