Structural and morphological dependences of Sb2S3 nanobars synthesised by organo-colloidal process on precursor concentrations and reaction times

Validžić, Ivana Lj.; Abazović, Nadica D.; Ahrenkiel, S. P.; Janković, Ivana A.

doi:10.1016/j.jcrysgro.2012.06.003

Cited by 10 publications

(2 citation statements)

References 19 publications

(23 reference statements)

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“…On the other side, the band-gap energy of Sb 2 S 3 , found in the literature, varies between 1.5 and 2.1 eV due to the variations in the crystallinity, size and shape [28][29][30][31][32][33], or thickness, size and temperature concerning Sb 2 S 3 films [34][35][36]. All of the organo-colloidal syntheses, that we have performed in order to obtain inorganic Sb 2 S 3 powders [37][38][39][40], revealed the lowest band-gap energy for this compound to be around 1.5-1.6 eV. In order to obtain material with even better morphological and electronic properties, we have performed the abovedescribed syntheses with a careful selection of fatty acids as complexing/capping agents and by increasing the temperature.…”

Section: Methodsmentioning

confidence: 99%

Structural analysis, electronic and optical properties of the synthesized Sb₂S₃nanowires with small band gap

Validžić

Mitrić

Abazović

et al. 2014

Semicond. Sci. Technol.

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We report a simple colloidal synthesis of two types of Sb 2 S 3 nanowires with small band gap and high aspect ratio. Field-emission scanning electron and transmission electron microscopies confirmed formation of high aspect ratio Sb 2 S 3 nanowires, separated in the form of bundles and coalesced with each other in long bars. Diffuse reflectance and absorption spectroscopies revealed that the optical band-gap energies of the synthesized nanowires separated in the form of bundles are 1.56 and 1.59 eV, and coalesced with each other in long bars are 1.36 and 1.28 eV, respectively. The structure refinement showed that Sb 2 S 3 powders belong to the orthorhombic structure with space group Pnma (no. 62). It was found that Sb 2 S 3 nanowires separated in the form of bundles predominantly grow along the [0 1 0] direction being in the needle-like shape. The nanowires coalesced with each other in long bars rise in the form of long bars, are ribbon-like in shape and have expressed {1 0 1} facets which grow along the [0 1 0] direction. No peaks in photoluminescence spectra were observed in the spectral range from 250 to 600 nm. In order to shed more light on the experimental results concerning the band-gap energies and, in the literature generally poorly investigated electronic properties of the synthesized material, we performed theoretical calculations of the electronic structure and optical properties of the Sb 2 S 3 samples synthesized here. This was done on the basis of density functional theory with the generalized gradient approximation, and also with an improved version of the exchange potential suggested recently by Tran and Blaha. The main characteristic is the significant improvement of the band gap value.

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Section: Methodsmentioning

confidence: 99%

Structural analysis, electronic and optical properties of the synthesized Sb₂S₃nanowires with small band gap

Validžić

Mitrić

Abazović

et al. 2014

Semicond. Sci. Technol.

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“…We know that the precursor concentration is of great importance in controlling the morphology and size of crystals [19–21]. Herein, the concentration of ZnTPP in CHCl 3 did not influence its morphology (Fig.…”

Section: Resultsmentioning

confidence: 89%

Controllable synthesis of zinc tetraphenylporphyrin microcrystals by a facile, fast and surfactant‐free process

Sun

et al. 2014

Micro & Nano Letters

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Uniform octahedral zinc tetraphenylporphyrin (ZnTPP) microcrystals were obtained in a large scale by a facile, fast and surfactant-free process at room temperature. The effects of synthetic parameters such as solvent and concentration on the formation and morphology of ZnTPP were investigated. Furthermore, by varying the reaction time, both the morphology and the size of the ZnTPP microcrystals can be controlled. Introduction:In recent years, controlled synthesis of organic nanocrystals with well-defined shapes, sizes and compositions had provided a powerful tool for tailoring their properties [1, 2], and has been applied in the fields of organic electronics and photonics [3][4][5], catalysis [6], biomedicine [7], sensors [8] and so on. However, rather weak supramolecular interactions, complicated mechanisms of kinetic growth and unclear correlation between the crystal morphology and molecular configuration make it a great challenge to controllably synthesise a highly symmetric polyhedron [9][10][11]. As a multifunctional ligand, porphyrins and their derivatives have been used as building blocks to coordinate with metallic ions to form metalloporphyrin materials [12]. So far, metalloporphyrin materials with different morphologies have been produced by self-assembly methods. For example, micro-scale three-dimensional (3D) coordination polymer particles have been synthesised from the surfactant-assisted reaction of Zn(OAc) 2 ·2H 2 O and 5,10,15,20-tetra(4-pyridyl)-porphyrin in dimethylformamide (DMF) [13], multi-strand metallo-supramolecular polymers were self-assembled by pyridyl-functionalised porphyrin derivatives on an Au (111) surface through pyridyl−Cu−pyridyl coordination [14], porphyrin-based hollow hexagonal nanoprisms could be prepared in a DMF/water system in the presence of cetyltrimethylammonium bromide (CTAB) [15], and the hollow nanostructures could be further organised into an ordered 3D architecture. Moreover, an evolution of various porphyrin derivative nanostructures from tubes, rods to fibres in a CHCl 3 -H 2 O-CTAB system has been found [16][17][18]. Recently, two series of organic nanocrystals of aquozinc tetraphenylporphyrin with well-controlled sizes and shapes have been synthesised [11] by the reduction of zinc tetraphenylporphyrin perchlorate (ZnTPP + ClO 4

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High‐efficiency Sb₂S₃‐based hybrid solar cell at low light intensity: cell made of synthesized Cu and Se‐doped Sb₂S₃

Janošević

Mitrić

Bundaleski

et al. 2015

Progress in Photovoltaics

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Cu-doped (as p-doped) and Se-doped (as n-doped) Sb 2 S 3 were synthesized from undoped Sb 2 S 3 using a newly developed technique, simple colloidal synthesis method. X-ray diffraction measurements detected no peaks related to any of the Cu and Se compounds in Cu and Se-doped samples. Energy dispersive X-ray analysis, however, confirmed the presence of Cu and Se ions in the doped samples. Diffuse reflectance spectroscopy revealed the optical band gap energy changes because of doping effect, as reported for both the p-type and the n-type material. The valence-band X-ray photoelectron spectroscopy data showed a significant shift in the valence band to higher (Se-doped; +0.53 eV) and a shift to lower (Cu-doped; À0.41 eV) binding energy, respectively, when compared with the undoped sample. We report here on an inexpensive solar cell designed and made entirely of a synthesized material (indium tin oxide/p-doped Sb 2 S 3 + polyaniline (PANI)/amorphous/undoped Sb 2 S 3 + PANI/n-doped Sb 2 S 3 + PANI/PANI/electrolyte (0.5 M KI + 0.05 M I 2 )/Al). The cell has a high efficiency of 8% to 9% at a very low light intensity of only 5% sun, which makes it particularly suitable for indoor applications. As found, the cell performance at the intensity of 5% sun is governed by high shunt resistance (R SH ) only, which satisfies standard testing conditions. At higher light intensities (25% sun), however, the cell exhibits lower but not insignificant efficiency (around 2%) governed by both the series (R S ) and the R SH . Minimal permeability in the UV region (up to 375 nm) and its almost constant value in the visible and the NIR region at low light intensity of 5% sun could be the reasons for higher cell efficiency.

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Structural and morphological dependences of Sb2S3 nanobars synthesised by organo-colloidal process on precursor concentrations and reaction times

Cited by 10 publications

References 19 publications

Structural analysis, electronic and optical properties of the synthesized Sb₂S₃nanowires with small band gap

Structural analysis, electronic and optical properties of the synthesized Sb₂S₃nanowires with small band gap

Controllable synthesis of zinc tetraphenylporphyrin microcrystals by a facile, fast and surfactant‐free process

High‐efficiency Sb₂S₃‐based hybrid solar cell at low light intensity: cell made of synthesized Cu and Se‐doped Sb₂S₃

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Structural and morphological dependences of Sb2S3 nanobars synthesised by organo-colloidal process on precursor concentrations and reaction times

Cited by 10 publications

References 19 publications

Structural analysis, electronic and optical properties of the synthesized Sb2S3nanowires with small band gap

Structural analysis, electronic and optical properties of the synthesized Sb2S3nanowires with small band gap

Controllable synthesis of zinc tetraphenylporphyrin microcrystals by a facile, fast and surfactant‐free process

High‐efficiency Sb2S3‐based hybrid solar cell at low light intensity: cell made of synthesized Cu and Se‐doped Sb2S3

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Product

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Structural analysis, electronic and optical properties of the synthesized Sb₂S₃nanowires with small band gap

Structural analysis, electronic and optical properties of the synthesized Sb₂S₃nanowires with small band gap

High‐efficiency Sb₂S₃‐based hybrid solar cell at low light intensity: cell made of synthesized Cu and Se‐doped Sb₂S₃