Coatings
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2023
·Vol. 13
·期 3
·500
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IF 3.4
Maolin Liu,Changqing Lin,Weicheng Ou,Han Wang,Chunyang Pan,Yuchen Ji,Hehui Zheng
Metal halide perovskite quantum dots (PQDs) are widely used in the display field due to their excellent photoelectric properties, such as ultra-narrow half-peak widths and ultra-pure luminescence color purity. Inkjet printing, laser direct writing and electrospinning are all common methods for PQDs printing to prepare micropattern displays. In order to produce large-scale and high-resolution PQDs micropatterns, electrohydrodynamic (EHD) printing technology is capable of large-scale deposition of highly oriented nanofibers on rigid or pliable, flat or bent substrates with the advantages of real-time regulation and single control. Therefore, it has a lot of potential in the fabrication of pliable electronic devices for one-dimensional ordered light-emitting fibers. Polycaprolactone (PCL) as an EHD printing technology polymer material has the advantages of superior biocompatibility, a low melting point, saving energy and easy degradation. By synthesizing CsPbBr3quantum dots (QDs) and PCL composite spinning stock solution, we used the self-built EHD printing platform to prepare the PCL@CsPbBr3composite light-emitting optical fiber and realized the flexible display of high-resolution micropatterns in polydimethylsiloxane (PDMS) packaging. An x-ray diffractometer (XRD), scanning electron microscope (SEM) and photoluminescence (PL) were used to characterize and analyze the fiber’s morphology, phase and spectral characteristics. EHD printing technology may open up interesting possibilities for flexible display applications based on metal halide PQDs.Keywords:perovskite;flexible display;photoluminescent fibers;EHD;CsPbBr3
研究领域:
材料科学
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光学工程
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显示技术
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DOI
高影响因子
Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-14
·
IF 23.4
Cai Junhu,Zhang Xiang,Chen Yu,Lai Wenzong,Ye Yun,Xu Sheng,Yan Qun,Guo Tailiang,Luo Jiajun,Chen Enguo
Multifunctional materials have attracted tremendous attention in intelligent and interactive devices. However, achieving multi-dimensional sensing capabilities with the same perovskite quantum dot (PQD) material is still in its infancy, with some considering it currently challenging and even unattainable. Drawing inspiration from neurons, a novel multifunctional CsPbBr 3 /PDMS nanosphere is devised to sense humidity, temperature, and pressure simultaneously with unique interactive responses. The carefully engineered polydimethylsiloxane (PDMS) shell enables the reversible activity of the core CsPbBr 3 , serving a dual role similar to dendrites in conveying and evaluating external stimuli with high sensitivity. Molecular dynamics analysis reveals that the PDMS shell with proper pore density enhances the conductivity in water and heat, imparting CsPbBr 3 with sensitive but reversible properties. By tailoring the crosslinking density of the PDMS shell, nanospheres can surprisingly show customized sensitivity and reversible responses to different level of stimuli, achieving over 95% accuracy in multi-dimensional and wide-range sensing. The regular pressure-sensitive property, discovered for the first time, is attributed to the regular morphology of the nanosphere, the inherent low rigidity of the PDMS shell, and the uniform distribution of the CsPbBr 3 core material in combination. This study breaks away from conventional design paradigms of perovskite core-shell materials by customizing the cross-linked density of the shell material. The reversible response mechanism of nanospheres with gradient shell density is deeply explored in response to environmental stimuli, which offers fresh insights into multi-dimensional sensing and interactive display applications.
研究领域:
材料科学
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传感器技术
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分子动力学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiongzhuang Jiang,Cong Geng,Xinxin Yu,Junye Pan,Huiren Zheng,Cheng Liang,Bin Li,Fei Long,Liyuan Han,Yi-Bing Cheng,Yong Peng
Wide-bandgap semitransparent perovskite photovoltaics are emerging as one of the ideal candidates for building-integrated photovoltaics (BIPV). However, surface defects in inorganic CsPbBr3 perovskite prepared by vapor deposition severely limit the optoelectronic performance of perovskite solar cells. To address this issue, a strategy of doping a trace amount of KBr into perovskite by vapor deposition is adopted, effectively improving the quality of the film, reducing surface defect concentration, and enhancing the transportation and extraction of charge carriers. Simultaneously, fully physical vapor deposition technology is employed to fabricate perovskite solar cells with an average visible light transmittance of 44%. These devices exhibited an ultrahigh open-circuit voltage of 1.55 V and a superior power conversion efficiency (PCE) of 7.28%, demonstrating excellent moisture and heat resistance. Moreover, the corresponding 5 cm × 5 cm modules achieve a PCE of 5.35% with great thermal insulation capability. This work provides an approach for fabricating highly efficient all-inorganic perovskite solar cells with high average visible light transmittance, demonstrating new insights into their application in building-integrated photovoltaics.
研究领域:
材料科学
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能源技术
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光伏器件
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yue Han,Guohui Li,Ting Ji,Yuying Hao,Yanxia Cui
In the endeavor to develop advanced photodetectors (PDs) with superior performance, all-inorganic perovskites, recognized for their outstanding photoelectric properties, have emerged as highly promising materials. Due to their unique electronic structure and band characteristics, the majority of all-inorganic perovskite materials are not sensitive to near-infrared (NIR) light. Here, we demonstrate the fabrication of a high-performance broadband PD comprising CsPbBr3 perovskite NCs/Y6 planar heterojunctions. The incorporation of Y6 not only facilitates charge transfer from CsPbBr3 NCs to Y6 for enhancing photodetection performance under visible illumination but also broadens the absorption spectrum range of the whole device toward the NIR regime. As a result, the heterojunction PD exhibits a photo-to-dark-current ratio above 105, a dynamic range of 149.5 dB, and an impressive lowest detection limit of incident power density of 1.6 nW/cm2 under 505 nm illumination. In the NIR regime, where photon energy is below the bandgap of CsPbBr3, electron–hole pairs can still be produced in the Y6 layer even when illuminated at 1120 nm. Consequently, photodetection is uniquely possible in PDs that incorporate heterojunctions when the illumination wavelength is longer than 565 nm. At 850 nm, the heterojunction device is capable of detecting light with power densities as low as 1.3 μW/cm2 corresponding to a LDR of 99.8 dB. The exceptional performance is attributed to the creation of a heterojunction between CsPbBr3 NCs and Y6. These findings propose a novel approach for developing broadband PDs based on perovskite NC materials.
研究领域:
材料科学
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光电子学
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PubMed
高影响因子
Small Structures
·
2024
·Vol. 5
·期 7
·2300577
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IF 13.9
Feiyu Diao,Qingye Zhang,Jiaju Wang,Wenshuang Liang,Federico Rosei,Xuyan Xue,Yiqian Wang
All-inorganic halide perovskites exhibit exceptional optical properties and are promising photoactive materials for optoelectronics. However, their stability remains a key challenge, exacerbated by a limited understanding of degradation mechanisms. Herein, in situ transmission electron microscopy (TEM) is used to investigate the effect of thickness on the structural stability of CsPbBr 3 nanobricks under electron beam irradiation. CsPbBr 3 nanobricks with different thicknesses have been prepared using a traditional hot-injection method, giving rise to a distinctive cubic structure. A modulated structure, caused by bromine vacancy ordering, has been observed in the thin nanobricks. The degradation behaviors of nanobricks are related to thickness-dependent bromine vacancy formation in the CsPbBr 3 lattice. More bromine vacancies exist in thin nanobricks than thick ones, resulting in a greater number of undercoordinated Pb atoms which accelerate irradiation-induced degradation. Decomposition products include Pb nanoparticles, which also demonstrate thickness-dependent characteristics. TEM images of Pb nanoparticles formed from thin nanobricks show evidence of irradiation-induced amorphization. In thicker nanobricks, Pb nanoparticle size increases with the duration of electron beam irradiation, while the remaining Cs atoms bond with Br atoms to form relatively stable CsBr nanoparticles. These results contribute to understanding of degradation mechanisms in cesium lead halide perovskites under electron beam irradiation.
研究领域:
材料科学
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物理学
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wei Wan,Ya-Yun Zhou,Long Yan,Binbin Su,Shi Ye
Cesium lead halide (CsPbX3, X = Cl, Br, I) perovskite quantum dots (QDs) have been intriguing optoelectronic materials for applications in various devices owing to their superior electronic and optical properties. However, poor resistance to humidity and light irradiation impedes their promotion. Herein, bulk perovskite-type layered CsCa2Ta3O10 is exfoliated into two-dimensional (2D) negatively charged Ca2Ta3O10– (CTO) nanosheets as seeds to in situ synthesize and composite CsPbBr3. The as-synthesized CsPbBr3/CTO nanocomposites possess improved green emission with apparently prolonged decay time with reference to bare CsPbBr3 QDs. The decay time can retrieve to a normal state when the nanocomposites are treated with some water. It is found that the CTO acts as a defect to trap the bound exciton of the loaded CsPbBr3. Protons from water can preferably replace Cs+ at the interface of the nanocomposites, resulting in the separation of the nanosheets and CsPbBr3 and retrieving the decay time. X-ray photoelectron spectroscopy results also indicate the strong interaction between CsPbBr3 and CTO with reference to the physical mixing sample of bare CsPbBr3 QDs and CTO nanosheets. The decoration of ultrathin 2D charge-bearing oxide nanosheets on the QDs benefits significant improvements in humidity resistance and photostability performance in light-emitting diode devices. This research offers a distinct strategy to modify the surface of perovskite QDs.
研究领域:
材料科学
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光学工程
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DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 5
·1783
·
IF 3.4
Chuanqi Liu,Wen Zhang,Dingyu Yang,Haibo Tian,Jun Zhu
The all-inorganic perovskite cesium lead bromine (CsPbBr3) has attracted much attention in the field of X-ray detectors because of its high X-ray absorption coefficient, high carrier collection efficiency, and easy solution preparation. The low-cost anti-solvent method is the main method to prepare CsPbBr3; during this process, solvent volatilization will bring a large number of holes to the film, leading to the increase of defects. Based on the heteroatomic doping strategy, we propose that Pb2+should be partially replaced by Sr2+to prepare leadless all-inorganic perovskite. The introduction of Sr2+promoted the ordered growth of CsPbBr3in the vertical direction, increased the density and uniformity of the thick film, and achieved the goal of CsPbBr3thick film repairing. In addition, the prepared CsPbBr3and CsPbBr3:Sr X-ray detectors were self-powered without external bias, maintaining a stable response during on and off states at different X-ray dose rates. Furthermore, the detector base on 160 µm CsPbBr3:Sr had a sensitivity of 517.02 µC Gyair−1cm−3at zero bias under the dose rate of 0.955 µGy ms−1and it obtained a fast response speed of 0.053–0.148 s. Our work provides a new opportunity to produce cost-effective and highly efficient self-powered perovskite X-ray detectors in a sustainable way.Keywords:X-ray;self-powered detectors;perovskite thick film;Sr-doped CsPbBr3
研究领域:
材料科学
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物理学
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PubMed
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Xudong Wu,Ruijie Xu,Xianli Li,Ruosheng Zeng,Binbin Luo
As a potential candidate for photocatalytic CO2 reduction, CsPbX3 perovskite nanocrystals (PNCs) have attracted enormous attention due to their suitable energy band structure and large molar extinction coefficient for visible light. However, the catalytic performance on CO2 reduction is greatly limited due to the intrinsically fast radiative recombination and poor stability of PNCs. In this work, PbS nanoparticles are uniformly anchored on CsPbBr3 PNCs with the assistance of a bridged amino acid due to the directed interaction between −COO– (−NH3+) and Pb2+ (Br–). Because of the small lattice mismatch between PbS and CsPbBr3, the introduction of PbS significantly quenches the emission of CsPbBr3 and boosts the interfacial charge transfer, thereby resulting in an enhanced photoelectrocatalytic CO2 reduction rate of ∼2.94 and 0.36 μmol cm–2 h–1 for CO and CH4 products, which are ∼2.4 times higher than that of pristine CsPbBr3 PNCs, respectively. This work provides a universal strategy of constructing homogeneous nanocomposites for catalytic applications.
研究领域:
材料科学
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光催化化学
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能源转换
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 48
·17403-17409
·
IF 7.059
Cuifang Meng,Dandan Yang,Ye Wu,Xuejia Zhang,Haibo Zeng,Xiaoming Li
Encapsulating cesium lead halide (CsPbX3, X = Cl, Br, and I) perovskite quantum dots (PQDs) into stable shells has been proved to be an effective strategy for improving their stability, which however usually forms agglomerated particles or alters PQDs’ original morphology and optical properties. Herein, we propose a surface activation strategy to prepare single CsPbBr3@SiO2 core–shell particles. (3-Aminopropyl)triethoxysilane (APTES) is used as a bifunctional surface ligand, which not only effectively passivates the surface defects of PQDs, but also provides –SiOCH3 and –SiOH groups for the formation of Si–O–Si covalent bonds with the subsequently introduced silanes. Furthermore, by controlling the hydrolysis rate of silanes, we realized the preparation of single CsPbBr3@SiO2 core–shell particles with an average shell thickness from 1 to 2.7 nm, and the PQDs maintained their initial cubic morphology and optical properties after coating. The stability of CsPbBr3@SiO2 in harsh environments has been effectively improved owing to the complete encapsulation of the SiO2 shell. As a result, the emission peak of CsPbBr3@SiO2 remains constant at 515 nm after being heated at 60 °C for 84 h, and the photoluminescence (PL) intensity still remains 90% after storage for 6 h in a high humidity environment. This work not only enhances the stability of PQDs for practical applications but also provides a reliable method to synthesize single core–shell particles, which can be instructive to other PQD systems.
研究领域:
材料科学
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纳米技术
·
化学
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高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-10
·
IF 14.919
Peng Jiali,Xia Chelsea Q.,Xu Yalun,Li Ruiming,Cui Lihao,Clegg Jack K.,Herz Laura M.,Johnston Michael B.,Lin Qianqian
Metal halide perovskites have fascinated the research community over the past decade, and demonstrated unprecedented success in optoelectronics. In particular, perovskite single crystals have emerged as promising candidates for ionization radiation detection, due to the excellent opto-electronic properties. However, most of the reported crystals are grown in organic solvents and require high temperature. In this work, we develop a low-temperature crystallization strategy to grow CsPbBr 3 perovskite single crystals in water. Then, we carefully investigate the structure and optoelectronic properties of the crystals obtained, and compare them with CsPbBr 3 crystals grown in dimethyl sulfoxide. Interestingly, the water grown crystals exhibit a distinct crystal habit, superior charge transport properties and better stability in air. We also fabricate X-ray detectors based on the CsPbBr 3 crystals, and systematically characterize their device performance. The crystals grown in water demonstrate great potential for X-ray imaging with enhanced performance metrics.
研究领域:
材料科学
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光学工程
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辐射探测技术
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Liguo Gao,Ke Zeng,Ye Jia,Lingxue Kong,Anmin Liu,Tingli Ma,Junjiang Bao
The epitaxial growth of heterojunctions can reduce interface defects and enhance the stability of the crystal structures. However, a higher lattice mismatch can cause local lattice distortions at the interface, resulting in relaxed strains that eventually evolve into structural defects. Herein, a nearly zero-mismatch semicoherent interface was formed with a lattice mismatch (0.3%) by epitaxial growth CsPbBr3 on CdS quantum dots (QDs), leading to a strain-free semicoherent interface. Results demonstrated that CdS/CsPbBr3 heteronanocrystals (HNCs) had excellent stability and high photocatalytic performance compared with CsPbBr3. Theoretical calculations show that the Br–Cd bond forms strong electron coupling, which not only facilitates rapid electron transfer but also provides better structural stability. Compared to the individual CsPbBr3 nanocrystals (NCs), the CdS/CsPbBr3 HNCs exhibited higher stability and 2.1 times higher photocatalytic activity. It suggests that CdS/CsPbBr3 HNCs have potential application value in energy and environmental fields.
研究领域:
材料科学
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纳米技术
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能源与环境科学
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高影响因子
Materials
·
2024
·Vol. 17
·期 7
·1607
·
IF 3.1
Hang Li,Jiazhen He,Xiaoqian Wang,Qi Liu,Xuemin Luo,Mingwei Wang,Jinfeng Liu,Chengqi Liu,Yong Liu
As a direct band gap semiconductor, perovskite has the advantages of high carrier mobility, long charge diffusion distance, high defect tolerance and low-cost solution preparation technology. Compared with traditional metal halide perovskites, which regulate energy band and luminescence by changing halogen, perovskite quantum dots (QDs) have a surface effect and quantum confinement effect. Based on the LaMer nucleation growth theory, we have synthesized CsPbBr3QDs with high dimensional homogeneity by creating an environment rich in Br−ions based on the general thermal injection method. Moreover, the size of the quantum dots can be adjusted by simply changing the reaction temperature and the concentration of Br−ions in the system, and the blue emission of strongly confined pure CsPbBr3perovskite is realized. Finally, optical and electrochemical tests suggested that the synthesized quantum dots have the potential to be used in the field of photocatalysis.
研究领域:
材料科学
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光电催化
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纳米技术
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PubMed
高影响因子
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