JOURNAL OF SOLID STATE CHEMISTRY
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2013
·
IF 2.04
Yong Xiang,Xiaokun Zhang,Shu Zhang
Sb-doping has been demonstrated to be a new approach to promote Cu(In,Ga)Se 2 (CIGS) thin film formation . To study the mechanism of Sb-promoted CIGS formation, we investigated the influence of Sb on the evolution of the critical intermediate Cu–Se phases, and found that Cu 3 SbSe 3 species was formed. Phase change of the as-prepared Cu–Se compounds at elevated temperature was determined using the differential scanning calorimetry analysis. For samples containing Sb, the melting decomposition occurred at 507.1 °C, along with aggregation of nanocrystals into a bulk, while the morphology of the sample without Sb barely changed after heating. This result suggests that the mobile Cu 3 SbSe 3 is likely the key intermediate responsible for Sb-promoted CIGS formation. Furthermore, we extended the scope of Sb-doping approach to solvothermal synthesis and CIGS nanocrystals were synthesized with significantly promoted kinetics in the presence of Sb. Based on these results, we propose the mechanism of Sb promoted CIGS formation.
研究领域:
材料科学
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太阳能电池
·
化学工程
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DOI
高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 18
·期 1
·2300809
·
IF 11
Xiankun Zheng,Lijin Wang,Jialin Bai,Han Zhang,Hanzhuang Zhang,Aiwei Tang,Wenyu Ji
Currently, the performance of quantum-dot light-emitting diodes (QLEDs) based on environmental-friendly Cu─In─Zn─S quantum dots (QDs) still lags far behind that of Cd-QDs-based devices. Here it is demonstrated that the unique trap-related recombination in Cu─In─Zn─S QDs is mainly responsible for the low device efficiency. The luminous efficiency of Cu─In─Zn─S-based QLEDs is rather sensitive to the temperature and hole-transporting layers (HTLs) due to the susceptible thermal-related trappingdetrapping processes of holes in radiative Cu-related traps. The holes in Cu-related traps can be quenched by escaping to the valence band of the QDs or/and transferring to the adjacent HTLs. An HTL with low highest occupied molecular orbitals is desired to enhance the hole injection and hinder the aforementioned hole transfer. As a result, a high device efficiency of 6.0 cd A −1 is achieved at room temperature, which is attributed to suppressed HTL-induced emission quenching and efficient valence-band-dominated hole injection from HTL to the QDs. The device efficiency is further increased to 13.2 cd A −1 at 150K by suppressing thermal-induced quenching.
研究领域:
材料科学
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光电技术
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DOI
高影响因子
ACS Omega
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2021
·
IF 3.512
Ze Yuan,Lanlan Yang,Dongni Han,Guorong Sun,Chenyu Zhu,Yao Wang,Qiao Wang,Mikhail Artemyev,Jianguo Tang
High-efficiency photoluminescence quaternary hexagon Zn–Cu–In–S (ZCIS) nanoplatelets (NPls) have been synthesized by a two-step cation exchange method, which starts with the In2S3 NPls followed by the addition of Cu and Zn. It is the first time that In2S3 NPls are used as templates to synthesize ZCIS NPls. In this paper, the reaction temperature of In2S3 is essential for the formation of NPls. The photoluminescence wavelength of NPls can be tuned by adjusting the temperature of Cu addition. To enhance the stability of the resulting NPls and to improve their optical properties, we introduced Zn2+ and obtained ZCIS NPls by cation exchange on the surface. It is worth noting that the obtained ZCIS NPls show a shorter fluorescence lifetime than other ternary copper sulfide-based NPls. This work provides a new way to synthesize high-efficiency, nontoxic, and no byproduct ZCIS NPls.
研究领域:
材料科学
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纳米技术
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光学
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DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Han XiaoLe,Yu Fan,Lei JiaWen,Zhu Jiahua,Fu HaiYan,Hu JunCheng,Yang Xiao-Long
Water-soluble Cu-In-Zn-S quantum dots (CIZS QDs) with orange fluorescence have been synthesized with a glutathione (GSH) as stabilizer via facile a one-step hydrothermal method. The optimal reaction conditions of CIZS QDs including temperature, time, pH, and the molar ratios of precursors were studied. TEM results indicate that the aqueous-dispersible CIZS QDs are quasi-spherical, and the average diameters are 3.76 nm with excellent fluorescent stability. Furthermore, the cytotoxicity of CIZS QDs was investigated by the microcalorimetry combining with TEM and the IC50 was 10.2 μM. CIZS QDs showed a promising perspective in applications such as a fluorescent probe for bioimaging and biolabeling due to the low cytotoxicity and good biocompatibility. Moreover, the CIZS QDs can distinguish Pb2+ ion from other ions, offering great potentials in lead ion determination in drinking water. According to the results of UV, XRD, FL, PL, and ITC methods, the mechanism of CIZS QDs-Pb2+ assay is due to hydrogen bonding or van der Waals forces in the formation of Pb2+ and CIZS QDs.
研究领域:
材料科学
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生物学
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医学
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环境科学
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DOI
PubMed
高影响因子
Carbon Energy
·
2025
·
IF 24.2
Mengmeng Ma,Runkang Lin,Kaige Huang,Shizhong Yue,Maohong Fan,Zhijie Wang,Shengchun Qu
Functionalization has emerged as a pivotal endeavor to tailor the surface properties of photocatalysts. We propose a facile amine functionalization strategy to establish a Cu−In−Zn−S (CIZS)/NiS x hybrid with covalent bonds using individual ethylenediamine (EDA) molecules. Our approach witnesses a remarkable photocatalytic hydrogen evolution (PHE) competence of 65.93 mmol g −1 h −1 driven by visible light, the highest value yielded by CIZS to date. X-ray absorption spectra of CIZS and density functional theory (DFT) calculations confirm the crucial amine N→Cu coordination after amine functionalization. The new emerging coordination via lone-pair electron donation profitably accesses the regulation of the coordination environment, electronic structures, and carrier behavior. Moreover, individual EDA molecule with two-terminal −NH 2 group serves as a molecular bridge to hybrid CIZS and NiS x cocatalyst via N→Cu and N→Ni coordination, favorably promoting efficient charge transport. This study provides advances in practical functionalizing photocatalysts.
研究领域:
材料科学
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化学
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DOI
高影响因子
RSC Advances
·
2012
·Vol. 2
·期 7
·2666-2670
·
IF 0
Meina Wang,Xiangyou Liu,Chuanbao Cao,Cui Shi
Cu–In–S ternary nanocrystals (NCs), with an average size of less than 10 nm, were synthesized in an aqueous solution containing bovine serum albumin (BSA). X-Ray powder diffraction (XRD) and selected-area electron diffraction (SAED) analyses showed that these NCs featured a roquesite structure. The composition of the NCs could be adjusted by controlling the molar ratio of the starting Cu/In precursors in the reaction solution, which led to a tunable band gap ranging from 1.48 eV to 2.30 eV. Cytotoxicity testing showed that the BSA-stabilized Cu–In–S NCs had little effect on the cell viability, which suggested that they are user-friendly and environmentally benign. With low cost, minimal energy input and environmental impact, this simple approach shows great potential for industrial applications.
研究领域:
材料科学
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纳米技术
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生物学
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环境科学
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DOI
Materials Research Express
·
2019
·Vol. 6
·期 4
·045514
·
IF 1.449
Jian Feng,Xiaosheng Yang,Rong Li,Xianjiong Yang,Hong Xu,Xiaolan Xi
Graphitic carbon nitride (g-C3N4) is the most stable allotrope of carbon nitride with a conjugated, two-dimensional polymer of s-triazine, which is considered as a promising photocatalyst in sustainable chemistry. The low surface area and quantum efficiency and fast electron-hole recombination of g-C3N4 restrict its practical application. The formation of two-dimensional mesoporous structure and the construction of proper semiconductor composites are two approaches to promote the effective separation of photogenerated exciton and reduce the charge transfer resistance, which is beneficial to restrain the recombination of exciton and improve photocatalytic hydrogen performance. In this work, two-dimensional mesoporous g-C3N4 nanosheets (MCNS) coupled with nonstoichiometric Zn-Cu-In-S (ZCIS) nanocrystals were synthesized by a hydrothermal method. The constructed ZCIS/MCNS composites possessed highly photocatalytic hydrogen evolution performance under visible light irradiation without any noble metal cocatalysts. The EIS spectra and transient photocurrent responses corroborated ZCIS/MCNS had higher separation and transportation efficiency of photogenerated electron and hole. The incorporation of ZCIS into MCNS reduced the charge transfer resistance and enhanced the charge transfer efficiency. As the result, the photocatalytic hydrogen evolution rate of ZCIS/MCNS was higher than those of pure ZCIS and MCNS. 10-0.2ZCIS/MCNS showed a highest H2 production rate of 12.3 μmol h−1 over 100 mg photocatalyst without cocatalysts. This work supplied a feasible strategy to construct ZCIS/MCNS composites for the exploitation of solar energy.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Changdi Wang,Hao Wang,Lu Li,Ruiyang Zhao,Jishu Han,Lei Wang
Photocatalytic hydrogen production technology is an efficient method to solve the environmental pollution problem and obtain renewable energy. To improve the hydrogen production efficiency, it is still a great challenge to develop novel photocatalysts with high activity and high stability. In this work, a hollow rod-shaped Cu-In-Zn-S@ZnCo 2 O 4 @In 2 O 3 tandem heterojunction photocatalyst was designed and synthesized. Under visible light irradiation, the photocatalytic hydrogen production amount was up to 21404.54 μmol·g −1 in 5 h. The hollow tandem heterojunction would improve the light absorption, facilitate the electron transfer, inhibit the recombination of photogenerated electrons and holes, and provide more active sites for hydrogen production reaction. The design of Cu-In-Zn-S@ZnCo 2 O 4 @In 2 O 3 photocatalyst provided an effective method to enhance the photocatalytic hydrogen production performance.
研究领域:
材料科学
·
能源与环境科学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 1
·258-265
·
IF 4.036
Lili Tan,Yanhong Liu,Baodong Mao,Bifu Luo,Guan Gong,Yuanzhi Hong,Biyi Chen,Weidong Shi
The development of single-component photocatalysts with narrow bandgaps (2.0–3.0 eV) has been one of the most important goals for photocatalytic H2 production, for which I–III–VI multinary sulfides play an important role due to their widely tunable composition-dependent bandgap. However, simultaneous bandgap narrowing and photocatalytic activity enhancement in the I–III–VI sulfides are often difficult to achieve due to increased defect states. Here, a series of Cu–In–Zn–S quantum dots (QDs) were synthesized by a facile hydrothermal method focusing on a more profound understanding of bandgap tuning and the subsequent effect on the photocatalytic process by controlling the Cu content. The bandgap of the QDs can be effectively tuned from 2.90 eV to 1.98 eV with an increasing Cu : In ratio from 0.05 : 10 to 2.5 : 10 and a color change from light yellow to dark red. The QDs show photocatalytic H2 production activity even without any cocatalyst, but it quickly starts to decrease with the Cu/In ratio over 0.1 : 10 (bandgap of 2.59 eV), which highly limits the potential for visible light photocatalysis. Interestingly, Pt-loading effectively enhanced not only the tolerance of Cu incorporation, but also enabled a high H2 production activity even with further bandgap narrowing down to ∼2 eV. The best photocatalytic performance of 456.4 μmol h−1 g−1 was achieved for the Cu : In : Zn ratio of 1 : 10 : 5 with a bandgap of 2.27 eV. This increased tolerance of Cu content may result from a combined effect of charge separation by Pt as the cocatalyst that alleviated the Cu-induced charge recombination. The enhanced charge separation was proved by the photoluminescence quenching of the QDs with the cocatalyst. Electrochemical impedance spectroscopy was further used to study the charge separation properties of this photocatalytic system. This is the first observation of the cocatalyst-enhanced tolerance of Cu resulting from the competition of cocatalyst-induced charge separation and defect-induced charge recombination in multinary sulfides, which provides an interesting view and design guideline for the development of narrow bandgap photocatalysts.
研究领域:
材料科学
·
光催化
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DOI
高影响因子
Materials Research Express
·
2018
·Vol. 5
·期 7
·075030
·
IF 1.151
Jian Feng,Xiaosheng Yang,Guangwei Feng,Hong Xu
In this study, the different compositions of Zn–Cu–In–S quantum dots (ZCIS QDs) were prepared by a facile synthetic approach. The compositions and particle sizes of ZCIS nanocrystals were precisely controlled. The composition-dependent molar extinction coefficient of nonstoichiometric ZCIS QDs has been determined by combination of ICP-MS with UV–vis absorption and TEM. The molar extinction coefficient values were found to comply with a power function with exponents of 3.6 and 1.8 with the variation of the content of Cu or Zn, respectively. The extinction coefficient of ZCIS QDs exhibited the composition dependency and seemed to be larger than that of CuInS2 for a given size. The determination of the extinction coefficient makes it feasible to calculate the concentration of ZCIS QDs in solution and promotes its further applications in bioanalysis.
研究领域:
材料科学
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光学
·
生物医学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 39
·10114-10120
·
IF 4.696
Zhenyang Liu,Aiwei Tang,Miao Wang,Chunhe Yang,Feng Teng
A simple heating-up colloidal approach has been developed to synthesize quaternary Cu–In–Zn–S (CIZS) nanocystals with different emission colors, which can be tuned by varying the Cu : In : Zn precursor ratios. The as-obtained products have a quasi-triangular shape with a small size distribution, and their crystal phase can be varied from cubic zinc-blende to hexagonal wurtzite structure with an increase of Cu stoichiometry. The inductively coupled plasma optical emission spectrometry (ICP-OES) results reveal that the as-obtained CIZS nanocrystals are Cu-deficient, and the Cu-vacancies have a significant effect on their optical properties. Moreover, the photoluminescence (PL) spectra of the CIZS nanocrystals recorded at different growth periods indicate that the partial cation exchange of Cu+ and In3+ with Zn2+ takes charge of the growth process. After coating a ZnS shell over the CIZS nanocrystals, the PL quantum yield (PLQY) is improved greatly and a blue-shift of the PL peak is observed as compared to that of plain CIZS nanocrystals. More interestingly, the highly luminescent CIZS/ZnS core/shell nanocrystals with different colors have been incorporated into poly(dimethylsiloxane) (PDMS) to be fabricated on an engraved “BJTU” glass substrate, and the as-obtained PDMS membranes exhibit a bright emission under UV light, which also show good stability when they are bent arbitrarily or immersed in water. This heating-up method has also been extended to the preparation of five-component Cu–Ag–In–Zn–S and Cu–Mn–In–Zn–S nanocrystals, which possess a cubic zinc-blende crystal structure and have bright luminescence. Our work may shed light on the synthesis of multi-component semiconductor nanocrystals.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2023
·Vol. 26
·期 24
·e202300303
·
IF 2.3
Youyang Xie,Pengtao Sheng,Weili Li,Yanling Li,Songtian Li
Graphical By changing Cu/In molar ratios of Cu−In−Se QDs from 0.3 : 1 to 0.9 : 1, the photoluminescence spectra displayed a remarkable red-shift from 700 nm to 1050 nm. Although there was a blue-shift after the introduction of Zn 2+ dopants. in Cu−In−Se QDs, a significant red-shift occurred from 660 nm to 760 nm when the Zn/Cu molar ratios decreased from 0.7 : 0.3 to 0.3 : 0.7. These results confirmed the strong effect of the Cu/In and Zn/Cu molar ratios on the intrinsic and dopants states related-transition channels, including the band-edge, conduction band-intragap acceptor, as well as the donor-acceptor. The large structural tolerance of I–III–VI group quantum dots (QDs) to off-stoichiometry allows their photoluminescence properties to be adjusted via doping, thereby enabling application in different fields. However, the photophysical processes underlying their photoluminescence mechanism remain significantly unknown. In particular, the transition channels of CuInSe 2 QDs, which are altered by intrinsic and extrinsic intragap states, remain poorly reported. Herein, we investigated the photophysical processes associated with intragap states via electrochemical and optical techniques by using copper deficient Cu−In−Se QDs as well as Zn doped Cu−In−Se QDs. When the Cu/In molar ratios of Cu−In−Se QDs increased from 0.3 : 1 to 0.9 : 1, the photoluminescence spectra displayed a red-shift from 700 nm to 1050 nm. Although there was a blue-shift after the introduction of Zn 2+ dopants in Cu−In−Se QDs, a significant red-shift occurred (from 660 nm to 760 nm) when the Zn/Cu molar ratios decreased from 0.7 : 0.3 to 0.3 : 0.7. The Gaussian deconvolution results of the photoluminescence spectra and the band gap derived from absorption spectra by fitting supported the fact that the optical transition channels are dependent on the Cu/In and Zn/Cu molar ratios. After the introduction of the Zn 2+ ions, the alloyed-resultant blue-shift of the emission spectra was observed, primarily due to the enlarged band gap; however, the radiative recombination of prominent intrinsic intragap states is still observed; and only a small proportion of the band-edge exciton undergoes recombination for the sample with low Zn content. Cyclic voltammetry measurements revealed well-defined extrinsic Zn Cu intragap states (Zn substitution on Cu sites) and intrinsic Cu x (x= 1+/2+) states in the band gap. The results presented here provide a better understanding of the varying effects of dopant on photoluminescence in terms of I–III–VI group QDs.
研究领域:
材料科学
·
光学
·
物理化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）