Crystallographic and optical properties of CuSbS 2  and CuSb(S 1-x Se x ) 2  solid solution

Takei, Koji; Maeda, Tsuyoshi; Wada, Takahiro

doi:10.1016/j.tsf.2014.11.029

Cited by 33 publications

(27 citation statements)

References 30 publications

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“…Very small particles on the surfaces of nanoplatelets for the ratio of 3.5 and 4 illustrates that probably there are some unreacted precursors in agreement with XRD patterns. These results are in agreement with earlier studies [38,39] confirming that CuSbS2 has both indirect and direct band gaps. Nevertheless, other observations exist as well.…”

Section: Morphological Observationssupporting

confidence: 94%

Solution synthesis of CuSbS 2 nanocrystals: A new approach to control shape and size

Moosakhani

Alvani

Mohammadpour

et al. 2018

Journal of Alloys and Compounds

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Chalcostibite copper antimony sulfide (CuSbS2) micro-and nanoparticles with a different shape and size have been prepared by a new approach to hot injection route. In this method, sulfur in oleylamine (OLA) is employed as a sulfonating agent providing a simple route to control the shape and size of the particles, which enables the optimization of CuSbS2 for a variety of applications. The sulfur to metallic precursor ratio appears to be one of the most effective parameters along with the temperature and time for controlling the size and morphology of the particles. The growth mechanism study shows in addition to the CuSbS2 phase the presence of not previously observed intermediate phases (stibnite (Sb2S3) and famatinite (Cu3SbS4)) at the initial stage of the reaction. By increasing the ratio of sulfur to copper and antimony, wider and thinner CuSbS2 particles are obtained. The particles have nanoplate and nanosheet morphology with a good shape and size uniformity. Coalescence of very thin nanosheets occurs with increasing reaction time eventually leading to formation of thicker particles which can be called nanobricks. Band gap determinations demonstrate that the obtained CuSbS2 particles have both direct (1.51-1.57 eV) and indirect (1.44-1.51 eV) bandgaps. Transmission Electron Microscopy (TEM) studies revealed that the preferred growth directions are along the basis axes of the unit cell ([100] and [010]). Optical and structural properties of the obtained CuSbS2 particles are indicative for their great potential in different generations of solar cells and supercapacitor applications.

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Section: Morphological Observationssupporting

confidence: 94%

Solution synthesis of CuSbS 2 nanocrystals: A new approach to control shape and size

Moosakhani

Alvani

Mohammadpour

et al. 2018

Journal of Alloys and Compounds

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“…Both indirect and direct band gap energies of CuSb(S,Se) 2 solid solutions were determined by the diffuse reflectance spectra of ultraviolet/ visible/near-infrared spectroscopy. Figure 1 shows the previously reported indirect (a) and direct (b) band gap energies of CuSb(S,Se) 2 (0.0 x 1.0) samples estimated by diffuse reflectance spectra [8]. The indirect and direct band gap energies of CuSbS 2 are 1.40 and 1.45 eV, respectively.…”

mentioning

confidence: 74%

“…We also studied preparation and some properties of CuSbS 2 , CuSbSe 2 , and their solid solutions [8]. We synthesized a CuSb(S,Se) 2 (0.0 x 1.0) powder sample by a mechanochemical process and post-heating.…”

mentioning

confidence: 99%

“…2 Experimental CuSb(S 1Àx Se x ) 2 (0.0 x 1.0) powder samples were synthesized by a mechanochemical process and post-heating. The preparation procedure was detailed in our previous paper [8]. Starting materials of elemental powders Cu, Sb, S, and Se were weighed to provide a molar ratio of Cu:Sb:S:Se ¼ 1:1:2(1 À x):2x.…”

mentioning

confidence: 99%

“…The ionization energy of the CuSb(S 1Àx Se x ) 2 (0.0 x 1.0) samples was directly measured by PYS. The photoelectron yield has the following relationship: Y $ I s $ A(hn À E WF ) 3 , Figure 1 Indirect (a) and direct (b) band gap energies of CuSb(S 1Àx Se x ) 2 sysem estimated by diffuse reflectance spectra [8]. where Y is the photoelectron energy, I s is the photocurrent, A is a constant, hn is the photon energy, and E WF is the energy of the difference between the vacuum level and the Fermi level, determined using the linear fit of the I s 1/3 versus hn plot.…”

mentioning

confidence: 99%

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Optical properties and electronic structures of CuSbS₂, CuSbSe₂, and CuSb(S_1−xSe_x)₂ solid solution

Wada

Maeda

2017

Phys. Status Solidi C

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To clarify electronic structures of CuSbS2, CuSbSe2, and CuSb(S1−xSex)2 solid solutions, these powder samples were synthesized by a mechanochemical process and post‐heating. CuSbS2 and CuSbSe2 have indirect and direct band gaps, of which the direct band gaps are a little wider than the indirect band gaps. The ionization energies of CuSb(S1−xSex)2 (0.0 ≤ x ≤ 1.0) powders were measured by photoemission yield spectroscopy (PYS). Energy levels of the valence band maximum (VBM) of the CuSb(S1−xSex)2 samples were estimated from the ionization energies. The electron affinity, energy level of conduction band minimum (CBM), of the CuSb(S1−xSex)2 samples could also be determined by adding the value of the optical band gap to the energy level of the VBM. The energy level of the VBM of the CuSb(S1−xSex)2 system monotonically increases from −5.45 eV for CuSbS2 (x = 0.0) to −5.15 eV for CuSbSe2 (x = 1.0). On the other hand, the energy levels of the indirect CBM of the CuSb(S1−xSex)2 system slightly decrease from −4.05 eV for CuSbS2 to −4.11 eV for CuSbSe2. The energy levels of the direct CBM also slightly decrease from −4.00 eV for CuSbS2 to −4.07 eV for CuSbSe2. We show the band alignment of CuSbS2 (CuSbSe2)‐based solar cells with a standard device structure of ZnO/CdS/CuSbS2 (CuSbSe2) absorber.

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Closed‐Loop Multi‐Objective Optimization for Cu–Sb–S Photo‐Electrocatalytic Materials’ Discovery

Bai,

Khoo,

I Made

et al. 2023

Advanced Materials

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Copper antimony sulphides are regarded as promising catalysts for photoelectrochemical water splitting because of their earth abundance and broad light absorption. The unique photoactivity of copper antimony sulphides is dependent on their various crystalline structures and atomic compositions. Here, we built a closed‐loop workflow that explores Cu‐Sb‐S compositional space to optimise its photoelectrocatalytic hydrogen evolution from water, by integrating a high‐throughput robotic platform, characterization techniques, and machine learning (ML) optimization workflow. The multiple‐objective optimization model discovered optimum experimental conditions after only nine cycles of integrated experiments‐machine learning loop. Photocurrent testing at 0 V versus reversible hydrogen electrode (RHE) confirmed the expected correlation between the materials properties and photocurrent. An optimum photocurrent of ‐186 µA cm−2 was observed on Cu‐Sb‐S in the ratio of 9:45:46 in the form of single‐layer coating on F‐doped SnO2 (FTO) glass with a corresponding bandgap of 1.85 eV and 63.2% Cu1+/Cu species content. The targeted intelligent search revealed a non‐obvious CuSbS composition that exhibited 2.3 times greater activity than baseline results from random sampling.This article is protected by copyright. All rights reserved

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Crystallographic and optical properties of CuSbS 2 and CuSb(S 1-x Se x ) 2 solid solution

Cited by 33 publications

References 30 publications

Solution synthesis of CuSbS 2 nanocrystals: A new approach to control shape and size

Solution synthesis of CuSbS 2 nanocrystals: A new approach to control shape and size

Optical properties and electronic structures of CuSbS₂, CuSbSe₂, and CuSb(S_1−xSe_x)₂ solid solution

Closed‐Loop Multi‐Objective Optimization for Cu–Sb–S Photo‐Electrocatalytic Materials’ Discovery

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Crystallographic and optical properties of CuSbS 2 and CuSb(S 1-x Se x ) 2 solid solution

Cited by 33 publications

References 30 publications

Solution synthesis of CuSbS 2 nanocrystals: A new approach to control shape and size

Solution synthesis of CuSbS 2 nanocrystals: A new approach to control shape and size

Optical properties and electronic structures of CuSbS2, CuSbSe2, and CuSb(S1−xSex)2 solid solution

Closed‐Loop Multi‐Objective Optimization for Cu–Sb–S Photo‐Electrocatalytic Materials’ Discovery

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Product

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Optical properties and electronic structures of CuSbS₂, CuSbSe₂, and CuSb(S_1−xSe_x)₂ solid solution