CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xianju Zhou,Shouchun Zhao,Jie Zhang,Guotao Xiang,Sha Jiang,Li Li,Yongjie Wang,Yanhong Li,Chuan Jing,Lu Yao,Hongmei Yang,Zhen Wang
As a new generation of luminous material , perovskite quantum dots (PQDs) possess many excellent properties. However, PQDs suffer from dramatic decrease of optical performance when affected by high temperature. In this paper, methamidine acetate (FA + ) and manganese divalent cation (Mn 2+ ) codoped CsPbCl 3 quantum dots (QDs) were synthesized. The introduced FA + and Mn 2+ were designed to substitute Cs + (A sites) and Pb 2+ (B sites), respectively. By comparison with CsPbCl 3 :Mn 2+ QDs, the results show that the CsPbCl 3 :FA + ,Mn 2+ QDs improve the blue exciton luminescence by 15% and the red Mn 2+ ions luminescence by 37%. Furthermore, CsPbCl 3 :FA + ,Mn 2+ QDs demonstrate super thermal stability by maintaining 97% of Mn 2+ emission when the temperature is raised to 70 °C even after 6 thermal cycles. Simultaneously, the UV light and water stability of CsPbCl 3 :FA + ,Mn 2+ QDs have also been obviously enhanced. The powder of the coped PQDs have been fabricated into a white LED which exhibits Color Rendering Index (CRI) of 88.2 and Correlated Color Temperature (CCT) of 5745 K. It shows that CsPbCl 3 :FA + ,Mn 2+ QDs not only reduce the Pb 2+ ions toxicity problem but also boost the thermal stability and thermal cyclability, which may open up more possibilities for the applications in optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Bixia Lin,Ying Yu,Ruoying Li,Yujuan Cao,Manli Guo
In this paper, a novel turn-on sensor was constructed for quantification and imaging of acetamiprid . Acetamiprid aptamer-modified ZnS:Mn probe (ZnS:Mn-Aptamer) was obtained by conjugating ZnS:Mn QDs with acetamiprid binding aptamer . The fluorescence of the probe was turn off by multi-walled carbon nanotubes (MWCNTs) based on fluorescence resonance energy transfer (FRET) between ZnS:Mn-Aptamer and MWCNTs. After acetamiprid was introduced, the fluorescence was turn on because ZnS:Mn-Aptamer specifically binded with acetamiprid. Based on the above-mentioned principle, the quantitative detection and imaging of acetamiprid in real samples were achieved. The linear equation could be described as F / F 0 = 1.101 + 0.0312 C A ( C A represented the concentration of acetamiprid, nM) in a linear range of 0–150 nM with a detection limit of 0.7 nM. The results suggested this method had remarkable sensitivity, selectivity , and was very simple without complex operation. Meanwhile, this novel turn-on sensor has the potential of in situ visual determination for pesticide residues in complex system.
研究领域:
分析化学
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环境科学
·
农药残留检测
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Rui Qu,Mingyang Gao,Haonan Li,Xiaofei Qi,Cheng Liu,Wu Zhao,Junfeng Yan,Zhiyong Zhang
Formamidinium lead bromide perovskite (FAPbBr 3 ) nanostructures have aroused increasing attention considering their excellent optoelectronic performance and higher stability than their MA- and Cs-based counterparts. Herein, we synthesized size-tunable FAPbBr 3 quantum dots (QDs) at room temperature. The size of the perovskite QDs could be ajusted from 5.4 to 2.3 nm by just varying the amount of Hydrobromic Acid (HBr) added into the precursor. As a result, the photoluminescence (PL) emissions exhibited large blueshift from 531 to 446 nm due to quantum confinement effect. Quantum mechanical calculations of the optical gap fitted well with the experimental results. We found that the addition of HBr not only increased the concentration of the Br − but also protonated the oleylamine ligands. The two events synergically governed the size-decreasing effect of the QDs with increasing amount of HBr. The size-tunable FAPbBr 3 QDs showed great application prospect in the field of photoelectric devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Jie Zhou,Dan Wang,Haifeng Yang,Feng Wang
Acetamiprid poses a serious threat to human beings. In this work, the highly transparent fluorescent quantitative PCR sealing membranes (PCR-M) developed in our previous work which had attractive characteristics such as sensitivity, stability and reproducibility, and its capability of extracting analytes quickly, was used to detect acetamiprid. The detection limit of 1 nmol/L was obtained by direct detection of CN group in acetamiprid. In order to improve the selectivity and sensitivity, acetamiprid aptamer was introduced. After the interaction of aptamer with acetamiprid the SERS signal of adenine at 730 cm −1 increased. The detection limit of indirect detection was 10 -8 mol/L. Aptamer advanced Ag-PCR-M-based Surface enhanced Raman spectroscopy (SERS) method for indirect SERS detection which significantly improves the detection sensitivity and greatly increases the range of signal response value. This will be conducive to the detection of actual samples and expand the practical application.
研究领域:
分析化学
·
食品安全检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-9
·
IF 4.122
Zhang Meng,Zhang Fan,Wang Yue,Zhu Lijie,Hu Yufeng,Lou Zhidong,Hou Yanbing,Teng Feng
Photodetectors based on three dimensional organic–inorganic lead halide perovskites have recently received significant attention. As a new type of light-harvesting materials, formamidinium lead iodide (FAPbI 3 ) is known to possess excellent optoelectronic properties even exceeding those of methylammonium lead iodide (MAPbI 3 ). To date, only a few photoconductor-type photodetectors based on FAPbI 3 single crystals and polycrystalline thin films in a lateral structure have been reported. Here, we demonstrate low-voltage, high-overall-performance photodiode-type photodetectors in a sandwiched geometry based on polycrystalline α-FAPbI 3 thin films synthesized by a one-step solution processing method and post-annealing treatment. The photodetectors exhibit a broadband response from the near-ultraviolet to the near-infrared (330–800 nm), achieving a high on/off current ratio of 8.6 × 10 4 and fast response times of 7.2/19.5 μs. The devices yield a photoresponsivity of 0.95 AW −1 and a high specific detectivity of 2.8 × 10 12 Jones with an external quantum efficiency (EQE) approaching 182% at −1.0 V under 650 nm illumination. The photodiode-type photodetectors based on polycrystalline α-FAPbI 3 thin films with superior performance consequently show great promise for future optoelectronic device applications.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Benjun Huo,Jie Yang,Yao Bian,Daofu Wu,Julin Feng,Jiaer Zhou,Qiang Huang,Fan Dong,Xiaosheng Tang
The superior optical properties and adjustable bandgap allows for hybrid halide perovskite quantum dots to be promising photocatalytic materials, but the serious radiative recombination and instability inhibit the improvement of photocatalytic conversion efficiency. Herein, we successfully synthesized the FAPbBr 3 /A-SiO 2 nanocomposites photocatalyst by anchoring formamidinium (FA + , HC(NH 2 ) 2+ ) lead halide perovskite quantum dots on aminated silica spheres to construct the composite photocatalysts via N H chemical bonding. The FAPbBr 3 /A-SiO 2 composites show the significantly enhanced visible-light-driven NO removal activity (70%) compared to the pristine FAPbBr 3 (30%) in half an hour at room temperature, revealing that the increased active sites and efficient charge carrier separation contribute to the absorption and activation of reactant molecules. This work would open the new possibilities for improving the photocatalytic ability of perovskite quantum dots.
研究领域:
材料科学
·
环境科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2019
·Vol. 21
·期 6
·3106-3113
·
IF 3.567
Guangbao Wu,Jiyu Zhou,Rui Meng,Baoda Xue,Huiqiong Zhou,Zhiyong Tang,Yuan Zhang
Here based on integral microcrystal (IMC) thin films of halide perovskites containing formamidinium (FA)/methylammonium (MA) mixed cations, afforded by a facile approach combining an anti-solvent and inverse temperature crystallization, we investigate the impact of the addition of MAPbBr3 on the phase, thermal and environmental stabilities as well as the opto-electronic properties in FA-based IMC films. By single-crystal XRD, FA based IMCs have been found to possess a perfect cubic structure showing a slight lattice contraction compared to pristine FAPbI3 crystals. In conjunction with optical and electrical analyses, the essential role of the introduced MA and Br ions in stabilizing the black phase in FA-based IMCs has been clarified, which explains the observed enhancement of photoluminescence and reduced trap densities. We also achieve stable pure FAPbI3 crystals that do not exhibit a yellow-phase transition after one month in air. By utilizing (FAPbI3)1−x(MAPbBr3)x IMCs as the photo-absorber, we realize highly photo-responsive photodiodes with a satisfactory stability in air and thermal stability upon heating. Of interest, the best photoresponsivity exceeding 300 A W−1 is achieved upon appropriate air-exposure, which is among the highest values reported for FA-based perovskite photodetectors. The air-modified optoelectronic behaviour can be related to the trap passivation through the surface physisorption of the environmental O2, leading to reduced trap densities and resultant harmful SRH recombination.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 23
·18758-18767
·
IF 2.779
Yang Akang,Zhang Lun,Xu Yinyan,Wang Qian,Lyu Mei,Lu Hongbo,Zhu Jun
Cs 2 AgBiBr 6 is a lead-free perovskite that shows great potential to solve the toxicity and instability of organic–inorganic lead perovskite. However, because of the poor interface contact and inferior film quality, the open-circuit voltage and the power conversion efficiency of the solar cells are inhibited. Herein, the Cs 2 AgBiBr 6 film quality is improved by adding formamidinium acetate into the precursor solution. With additive regulation, the grain size increases and the film surface is more smooth. The crystal structure remains unchanged, and the defect density decreases. Correspondingly, the average power conversion efficiency of the target device increases more than 30% than the control device. The best efficiency approaches 2.09%, and the open-circuit voltage is surprisingly high at 1.23 V, the highest value reported for Cs 2 AgBiBr 6 solar cells. Moreover, the device remains more than 90% of its initial efficiency after 40 days of storage under environmental conditions, showing excellent stability. This work is therefore helpful for enhancing the efficiency and stability of inorganic lead-free perovskite solar cells toward future commercialization.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Chenhui Duan,Zihui Liang,Jinguo Cao,Bowen Jin,Yidong Ming,Shimin Wang,Binghe Ma,Tao Ye,Congcong Wu
Formamidinium (FA)-based perovskites remained state-of-the-art in the field of perovskite solar cells (PSCs) owing to the exceptional absorption and carrier transport properties, while the transition from photoactive (α-) to photoinactive (δ-FAPbI3) phase is the impediment that causes performance degradation and thus limits the deployment of FA-based PSCs. The unfavorable phase transition originates from tensile strain in the FAPbI3 crystal lattice, which undergoes structural reorganization for lattice strain balancing. In this work, we found that the ionic liquid (IL) could be used as the strain coordinator to balance the lattice strain for stability improvement of FAPbI3 perovskite. We theoretically studied the electronic coupling between IL and FAPbI3 and unraveled the originality of the IL-induced compressive strain. The strain-relaxed α-FAPbI3 by IL showed robust stability against environmental factors, which can withstand ambient aging for 40 days without any phase transition or decomposition. Moreover, the strain-relaxed perovskite films showed a lower trap density and resulted in conversion efficiency improvement from 18.27 to 19.88%. Based on this novel strain engineering strategy, the unencapsulated PSCs maintained 90% of their initial efficiency under ambient-air aging for 50 days.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 17
·2202726
·
IF 9
Qianwen Guan,Huang Ye,Tingting Zhu,Xinyuan Zhang,Shihai You,Jianbo Wu,Youxuan Zheng,Xitao Liu,Junhua Luo
Chiral halide perovskites have emerged as promising circularly polarized light sources due to their great potential applications in 3D displays, optical data storage, and optical communication devices. However, to date, chiral halide perovskites with efficient blue circularly polarized luminescence (CPL) are scarcely unearthed. Herein, through formamidine engineering to decrease lattice distortion, the first new types of chiral corrugated 2D halide perovskites are presented ( R / S )-(BPEA)FAPbBr 4 ·H 2 O (2- R / S ) (BPEA = 4-bromophenylethylaminium, FA = formamidinium). Interestingly, driven by the incorporation of FA organic cations, the chiral perovskite layer realizes the transformation from (100)-oriented ( R / S )-(BPEA) 2 PbBr 4 ·H 2 O (1- R / S ) to (110)-oriented 2- R / S accompanying with reduced lattice distortion. More importantly, (110)-oriented chiral perovskites 2- R exhibit remarkable blue CPL with large asymmetry factors ( g lum =8.4 × 10 −3 ). This work offers an exciting approach to realizing efficient blue CPL and promotes their further applications in photoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tian Hou,Xiaoran Sun,Zhipeng Fu,Zhicheng Wang,Linhu Xiang,Yuelong Huang,Xiaojing Hao,Meng Zhang
Formamidinium lead triiodide (FAPbI 3 ) perovskite materials exhibit tremendous potential for next-generation solar cell applications. However, the fabrication of FAPbI 3 thin films usually requires a quenching treatment with a narrow processing window to achieve the desired morphology. Meanwhile, the use of methylammonium (MA)-containing additives assists the crystallization of FAPbI 3 but raises concerns on the device stability due to the residual MA cation. Here, we present a highly reproducible approach for quenching-free deposition of FAPbI 3 films without using any MA-containing additives. The bifunctional surfactant of benzalkonium chloride is found simultaneously contributing to a more compact multicrystalline films with reduced pinhole density, as well as a dramatically improved moisture stability of the quenching-free FAPbI 3 film. The corresponding FAPbI 3 perovskite solar cell exhibits a decent tolerance to minor pinholes and achieved a power conversion efficiency up to 23.5% under 1 sun illumination, and also presents improved storage and operational stability.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Joule
·
2024
·
IF 38.6
Chunjie Huang,Shan Tan,Bingcheng Yu,Yiming Li,Jiangjian Shi,Huijue Wu,Yanhong Luo,Dongmei Li,Qingbo Meng
Meniscus coating technique is extensively employed for fabricating large-area perovskite films. Based on this technique, there are still challenges of formamidinium lead triiodide (FAPbI 3 ) nucleation and crystallization in the film-forming process, which significantly hinders the device performance of perovskite solar cell (PSC) modules. Here, we developed a kind of meniscus-modulated blade coating method combined with solvent engineering to realize scalable, high-quality α-phase FAPbI 3 films with larger grain sizes, preferred crystal orientation, excellent uniformity, and controllable thickness. On this basis, a notable 25.31% power conversion efficiency (PCE) for small-area cells (0.09 cm 2 ) and 23.34% PCE for minimodules (aperture area: 12.4 cm 2 ) with a certified PCE of 23.09% have been achieved. Besides, this minimodule exhibited exceptional device stabilities by remaining above 93% of the initial value after 2,000 h outdoor aging testing. This work provides a very promising meniscus coating fabrication method to realize high-performance FAPbI 3 perovskite solar cells and photovoltaic modules.
研究领域:
材料科学
·
太阳能电池技术
·
薄膜制备工艺
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）