JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 12
·10487-10493
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IF 2.324
He Qinjiang,Fu Renli,Zhu Haitao,He Hong,Song Xiufeng,Liu Xuhai
Eu 2+ doped strontium aluminate phosphors Ca y Sr 4−x−y Al 2 O 7 :xEu 2+ (0 ≤ x ≤ 0.1, 0 ≤ y ≤ 0.1) were synthesized via a novel halide-assisted solid-state reaction method. The phase structure and photoluminescence properties of Ca y Sr 4−x−y Al 2 O 7 :xEu 2+ were characterized via X-ray diffraction (XRD) and fluorescence spectrophotometer. The XRD patterns indicate that the α-Sr 4 Al 2 O 7 phase structure with negligible impurities were produced in the samples of Ca y Sr 4−x−y Al 2 O 7 :xEu 2+ (x ≤ 0.1 and y ≤ 0.1) at 1450 °C. Photoluminescence results show that the Ca y Sr 4−x−y Al 2 O 7 :xEu phosphor with NH 4 I as reductant presents typical intense Eu 2+ red emission bands centered at 610 nm while excited by 450 nm. Accordingly, samples without NH 4 I only exhibit two weak Eu 3+ emission peaks located at 598 and 619 nm, respectively. It can be ascribed to the reduction characteristic of I − ion. Furthermore, by partial replacement of Sr 2+ with Ca 2+ in Sr 4 Al 2 O 7 host, the emission intensity is enhanced up to 260% with emission peak red shifted by 5–10 nm. These results indicate that partial substitution of Sr 2+ by Ca 2+ is an efficient way to increase the proportion of longer wavelength emission and luminescence intensity for Sr 4 Al 2 O 7 :Eu phosphors.
研究领域:
材料科学
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光学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 36
·12560-12567
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IF 7.059
Linlin Qiu,Lika Dong,Deqiang Mei,Wei-Hsiang Chen,Lixin Song,Jieqiong Wang,Jiacheng Zou,Pei-Cheng Jiang,Pingfan Du,Jie Xiong
Perovskite films can be prepared using sec-butyl alcohol (2-BA) by a one-step antisolvent assisted method. However, 2-BA dissolves a necessary perovskite precursor, methylammonium iodide, CH3NH3I, (MAI), which is lost during the fabrication, leaving behind residues of another perovskite precursor, PbI2. The resulting perovskite films show reduced power conversion efficiency (PCE) and poor stability to ambient conditions. In this work, we propose an elegant strategy, i.e., the introduction of a small amount of MAI dissolved in the antisolvent 2-BA (1 mg mL−1). The additional MAI can react with the residual PbI2 during the fabrication to form the desired organic–inorganic hybrid perovskite material, CH3NH3PbI3. The high-quality of the perovskite films obtained can provide larger grain sizes and smoother surfaces, with an ideal PCE of 19.29% and superior moisture stabilities.
研究领域:
材料科学
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太阳能技术
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DOI
高影响因子
Science Bulletin
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2018
·
IF 4.136
Aqiang Liu,Kang Liu,Huimin Zhou,Hongmei Li,Xiaoqing Qiu,Yi Yang,Min Liu
Organic-inorganic hybrid perovskite solar cells (PSCs), due to their high power conversion efficiency (PCE) and low cost, have been considered as one of the most promising photovoltaic devices . Well-distributed large-grain perovskite crystals play an important role for light adsorption and charge transfer. While, high quality perovskite crystals closely relate to the preparation method. Generally, the preparation of perovskite films requires a nitrogen atmosphere and toxic anti-solvents, which hinder their practical applications. Here, we reported a novel and simple solution evaporation process followed with a methylammonium iodide (MAI) solution immersion to prepare high quality perovskite films. Porous lead iodide (PbI 2 ) films were firstly formed by evaporation of PbI 2 precursor solution . The obtained porous PbI 2 films were completely transformed into well-distributed large-grain perovskite films after a quick MAI solution immersion. As a result, the corresponding PCE was enhanced by 30% compared to that prepared with a regular sequential deposition. This solution evaporation method provides a convenient and practical way for preparing high-quality perovskite films.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2015
·Vol. 107
·期 6
·
IF 3.302
Liu Lijia,McLeod John A.,Wang Rongbin,Shen Pengfei,Duhm Steffen
The formation mechanism of perovskite methylammonium lead triiodide (CH 3 NH 3 PbI 3 ) was studied with in situ X-ray photoelectron spectroscopy (XPS) on successive depositions of thermally evaporated methylammonium iodide (CH 3 NH 3 I) on a lead iodide (PbI 2 ) film. This deposition method mimics the “two-step” synthesis method commonly used in device fabrication. We find that several competing processes occur during the formation of perovskite CH 3 NH 3 PbI 3 . Our most important finding is that during vapour deposition of CH 3 NH 3 I onto PbI 2 , at least two carbon species are present in the resulting material, while only one nitrogen species is present. This suggests that CH 3 NH 3 I can dissociate during the transition to a perovskite phase, and some of the resulting molecules can be incorporated into the perovskite. The effect of partial CH 3 NH 3 substitution with CH 3 was evaluated, and electronic structure calculations show that CH 3 defects would impact the photovoltaic performance in perovskite solar cells. The possibility that not all A sites in the A PbI 3 perovskite are occupied by CH 3 NH 3 is therefore an important consideration when evaluating the performance of organometallic trihalide solar cells synthesized using typical approaches.
研究领域:
材料科学
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物理化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Xiaoyu Yang,Lu Chen,Xiuxiu Xiong,Yun Shu,Dangqin Jin,Yang Zang,Wei Wang,Qin Xu,Xiao-Ya Hu
Herein, a kind of dual polymers, molecularly imprinted polymers (MIPs) and polyethylene glycol (PEG), coated perovskite (MIP-PEG/CH 3 NH 3 PbI 3 ) was synthesized and used to construct a photoelectrochemical (PEC) sensor for salicylic acid (SA) detection. A selective MIP layer for SA recognition was anchored on the PEG modified CH 3 NH 3 PbI 3 through a facile UV-polymerization process. PEG benefits the water-resistant ability of CH 3 NH 3 PbI 3 and MIPs endows the photoactive CH 3 NH 3 PbI 3 good selectivity. Thanks to the protection from PEG and MIPs, the MIP-PEG/CH 3 NH 3 PbI 3 product showed stable photocurrents in aqueous solution. Furthermore, methylammonium iodide (MAI) contained electrolyte was used in which MAI could restore the degraded part of CH 3 NH 3 PbI 3 to improve its stability. SA was detected by monitoring the photocurrent signal changes of the PEC sensor resulting from the reaction between SA and MIPs. The as-fabricated PEC sensor showed good performance in terms of sensitivity and selectivity. The linear range between the photocurrent changes and the concentrations of SA was from 1.0 × 10 -15 to 7.0 × 10 -11 M. This work unveiled the promise of organic-inorganic hybrid lead halide perovskite based structure for PEC sensors and inspired more interests in the development of diverse perovskite-based materials for advanced PEC analysis.
研究领域:
材料科学
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分析化学
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纳米技术
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环境科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 17
·1-11
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IF 2.8
Mei Xiang,Xiang Zhiwei,Mo Dingdiao,Fu Weihai,Jin Peixuan,Huang Xiaocong,Yang Yuanzheng,Cai Weitong
CsPbBr 3 perovskite solar cells (PSCs) have attracted a lot of attention due to their excellent long-term stability and easy fabrication in humid air. The preparation of the light-absorbing layer is crucial for achieving high efficiency in CsPbBr 3 perovskite solar cells. In this study, methylammonium iodide (CH 3 NH 3 I, MAI) was introduced into the PbBr 2 precursor solution to improve the quality of perovskite films and the photovoltaic performance of PSCs. The spin-coating method was employed to prepare CsPbBr 3 films in ambient air. Firstly, a layer of PbBr 2 film was spin-coated, followed by two spin-coatings of CsBr solution on top of it. By adjusting the content of MAI additives, a PbBr 2 film with a microporous structure was obtained. These porous structures acted as channels for CsBr molecules, enabling them to react fully with PbBr 2 and more favorable for the crystallization of CsPbBr 3 . As a result, we achieved the high-purity, high-crystallinity, and continuous CsPbBr 3 films. Furthermore, we utilized CsPbBr 3 films as the light-absorbing layer in PSCs with a structure of FTO/c-TiO 2 /m-TiO 2 /CsPbBr 3 /carbon, a champion power conversion efficiency of 8.02% was achieved, and the unencapsulated device showed excellent long-term stability.
研究领域:
材料科学
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太阳能
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纳米技术
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DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 59
·31393-31399
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IF 3.708
Jingyi Liu,Haiping Li,Na Du,Shue Song,Wanguo Hou
BiOI hierarchical flower-like microspheres were hydrothermally prepared, using tetrabutylammonium iodide as an iodine source and template. Many BiOI hierarchical structures have been synthesized using KI, NaI, HI or ionic liquids as the iodine source, but the use of alkyl ammonium iodide as the iodine source was not reported in the literature. The so-obtained BiOI samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen sorption measurements, and ultraviolet-visible diffuse reflectance spectroscopy. The effects of hydrothermal temperature and time on the BiOI crystal structure and morphology were investigated. The BiOI microspheres were composed of BiOI nanosheets. The photocatalytic performance of the BiOI samples was determined from the degradation of Rhodamine B, under visible light irradiation. BiOI microspheres prepared at 160 °C over 30 h exhibited excellent photodegradation efficiency, which was more than five and seven times higher than those of BiOI nanoplates and N-doped TiO2, respectively. The high photocatalytic performance was attributed to the high specific surface area and low nanosheet thickness. A morphologic factor was proposed to represent the ratio of specific surface area to nanosheet thickness, and correlated to the photodegradation efficiency of the BiOI samples. The photocatalytic efficiency increased with increasing morphologic factor. The BiOI photocatalyst exhibited excellent stability and reusability, and has potential in environment remediation.
研究领域:
材料科学
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化学
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环境科学
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纳米技术
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DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Zhihua Feng,Bo Tang,Kexin Liu,Qingqing Hou,Zhangting Dang,Cui Yang,Xiufu Hua,Qiushuo Yu,Lingling Wang,Renbo Wei
The chemical transformation of CO 2 into high-value-added products is not only favourable to environmental preservation, but also promising for economy. Developing novel and practical catalysts play a critical role in facilitating conversion of CO 2 and the synthesis of high value-added chemicals. Herein, we present the fabrication of biphenyl-typed copper phthalocyanine polymer (BPh-CuPc) from 4,4’-bis(3,4-dicyanophenoxy)biphenyl via a one-pot synthesis procedure, and application of it as a promising catalyst for CO 2 conversion into cyclocarbonate. FTIR, XPS, UV–vis, TGA and SEM measurements confirm the successful fabrication of BPh-CuPc. Attributing to the existence of copper ions which can act as a Lewis acid to activate epoxide, and phthalocyanine rings that is positive for CO 2 absorption, within the chemical framework of BPh-CuPc, it exhibits excellent catalytic activity for CO 2 conversion into cyclic carbonates under mild conditions when combined with tetrabutylammonium iodide (TBAI). As a result, a 98 % yield and 99 % selectivity are obtained for the BPh-CuPc/TBAI system in CO 2 /propylene oxide conversion under condition of 90 °C, 8 h and 2.0 MPa. The obtained high yield and selectivity, as well as remarkable stability and versatility, validate the promising application of BPh-CuPc as a CO 2 conversion catalyst. Synopsis Attributing to the existence of copper ions and phthalocyanine rings within the chemical framework, BPh-CuPc exhibits excellent catalytic activity for CO 2 conversion into cyclic carbonates under mild conditions.
研究领域:
催化
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材料科学
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环境化学
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聚合物化学
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DOI
高影响因子
ACTA MATERIALIA
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2025
·
IF 9.3
Jian Xu,Jingchen Zhang,Zeyu Hao,Xiliang Gong,Zeshuo Meng,Yutong Zhao,Shulong Wang,Haoteng Sun,Hongwei Tian,Dawei Su
Bismuth oxide, with its large internal spaces and adjustable structures, is a promising electrode material for zinc-ion batteries (ZIBs). However, its application is limited by poor reversibility and rapid capacity fading in neutral zinc-ion electrolytes. Here, we introduce selenium into bismuth oxide using chemical vapor deposition, precisely controlling the Se content by adjusting the gas flow rate. The Se-doped materials, particularly CC/Bi 2 O 2.5 Se 0.5 and CC/Bi 2 O 2 Se, exhibit significant improvements in specific capacity and cycling stability. CC/Bi 2 O 2 Se achieves a maximum specific capacity of 312.5 mAh g −1 at 0.1 A g −1 , with a retention rate of 74.6% after 4000 cycles at 2 A g −1 . The enhanced performance is attributed to the narrowed band gap and improved electrical conductivity resulting from Se doping, which facilitates electron and ion transport. More importantly, Se incorporation mitigates the formation of detrimental by-products, ensuring more reversible and efficient Zn-ion storage. It also stabilizes the Bi 3+ ↔Bi° conversion pathway observed during cycling, providing a metal-centered rationale for the improved reversibility. This work highlights the importance of electronic structure regulation in optimizing the performance of metal oxide electrodes and provides valuable insights for the rational design of high-performance energy storage materials.
研究领域:
材料科学
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储能
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电化学
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纳米材料
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产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Tong Bo,Xu Jiajun,Du Jinhong,Liu Peitao,Du Tianming,Wang Qiang,Li Langjun,Wei Yuning,Li Jiangxu,Liang Jinhua,Liu Chi,Liu Zhibo,Li Chen,Ma Lai-Peng,Chai Yang,Ren Wencai
Machine learning is the core of artificial intelligence. Using optical signals for training and converting them into electrical signals for inference, combines the strengths of both, and thus can greatly improve machine learning efficiency. Optoelectronic memories are the hardware foundation for this strategy. However, the existing optoelectronic memories cannot modulate a large number of non-volatile resistive states using ultra-short and ultra-dim light pulses, leading to low training accuracy, slow computing speed and high energy consumption. Here, we synthesized a van der Waals layered photoconductive material, (NH 4 )BiI 3 , with excellent photoconductivity and strong dielectric screening effect. We further employed it as the photosensitive control gate in a floating-gate transistor, replacing the commonly used metal control gate, to construct an optical floating gate transistor which achieves adjustable synaptic weights under ultra-dim light without gate voltage assistance. Moreover, it shows ultra-low training energy consumption to generate a non-volatile state and the largest resistive state numbers among the known non-volatile optoelectronic memories. These exceptional performances enable the construction of one-transistor-one-memory device arrays to achieve ~99% accuracy in Artificial Neural Networks. Moreover, the device arrays can match the performance of GPU in YOLOv8 while greatly reducing energy consumption.
研究领域:
材料科学
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人工智能
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电子工程
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产品关联
DOI
PubMed
高影响因子
ACS Photonics
·
2025
·
IF 6.7
Yingming Wang,Lingyan Xu,Lu Liang,Zhentao Qin,Shuai Han,Chongqi Liu,Lixiang Lian,Wei Zheng,Yanyan Lei,Qinzeng Hu,Tao Wang,Wanqi Jie
Achieving real-time, high-sensitivity radiation detection with stability and precision remains a critical challenge in medical diagnostics and radiation therapy. Here, we report the development of MDABCO-NH4(BF4)3 single crystals (SCs), a metal-free perovskite material with exceptional performance for both X-ray and charged particle detection. Large-scale MDABCO-NH4(BF4)3 SCs (15 × 13 × 5 mm3) were synthesized via a simple low-temperature solution method, achieving superior crystallinity with a full width at half-maximum (fwhm) of 0.0061°. The MDABCO-NH4(BF4)3 detectors exhibit high resistivity (1.31 × 1012 Ω·cm), low trap density (1.09 × 109 cm–3), and excellent charge transport properties ((μτ)h = 3.15 × 10–5 cm2·V–1). For α-particle detection, the MDABCO-NH4(BF4)3 detectors achieve a high energy resolution of 35.0% at 5.49 MeV and a fast response time of 5 ms, demonstrating single-particle sensitivity. For X-ray detection, MDABCO-NH4(BF4)3 detectors exhibit high sensitivity (13,529 μC·Gyabs–1·cm–2) and an ultralow detection limit (17.1 nGyair·s–1), significantly lower than the 5.5 μGyair·s–1 standard for active personal dosimeters used in regular medical diagnostics. The combination of superior charge transport properties with stability and high signal-to-noise ratio establishes MDABCO-NH4(BF4)3 SCs as a versatile material for real-time radiation monitoring and high-precision medical imaging applications.
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DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Long Zhou,Meng Xu,Jiahao Geng,Yiran Shi,Zhaolin Song,Yuxuan Liu,Hui Yu,Menghua Zhu
Metal-free perovskites exhibit significant potential for wearable X-ray detectors due to the non-toxic nature, degradability, aqueous solution processability and superior optoelectronic properties. DABCO-NH4I3 (DABCO denoted as N-N’-diazabicyclo[2.2.2]octonium), is a promising metal-free perovskite for the advantages of reduced exciton binding energy, enhanced mobility-lifetime product and superior absorption coefficients. However, the undesirable X-ray detecting performance of the device restricts its application. Reducing the dimensions of perovskite materials and adjusting crystal orientation are effective methods for improving optoelectronic properties and enhancing detection performance. Herein, high quality one-dimensional DABCO-NH4I3 single crystal is synthesized and in contrast to the conventional X-ray photoconductivity fitting approach, the time-of-flight (TOF) method using alpha particle-induced pulses is first employed to study the differences in single carrier transport performance between the [001] and [010] directions. The fitting results show that the hole mobility-lifetime product (μτ) for the [001] and [010] directions are 1.1×10-3 cm2 V-1 and 2.9×10-4 cm2 V-1, hole mobilities (μ) of 55.53 cm2 V-1s-1 and 4.63 cm2 V-1s-1, respectively. Furthermore, X-ray response results demonstrate a higher sensitivity of 62.1 μC Gy-1 cm-2 with a lower detection limit of 0.16 μGy s-1 for the [001] direction at 70V (sensitivity of 9.2 μC Gy-1 cm-2 with a detection limit of 0.16 μGy s-1 is for [010] direction). Hence, enhanced performances are successfully obtained by investigating the transport anisotropy of DABCO-NH4I3 perovskite which also provides a feasible route to improve the detecting performance of metal-free perovskites and promote its application.
研究领域:
材料科学
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应用物理
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光电子学
·
辐射探测
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产品关联
DOI
高影响因子
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