ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Tao Wang,Gang Lian,Liping Huang,Fei Zhu,Deliang Cui,Qilong Wang,Qingbo Meng,Ching-Ping Wong
Perovskite single-crystal (SC) or quasi-single-crystal (QSC) films are promising candidates for excellent performance of photoelectric devices. However, it is still a great challenge to fabricate large-area continuous SC or QSC films with proper thickness. Herein, we propose a pressure-assisted high-temperature solvent-engineer (PTS) strategy to grow large-area continuous MAPbI3 QSC films with uniformly thin thickness and orientation. Dramatic grain growth (∼100 μm in the lateral dimension) and adequate boundary fusion are realized in them, vastly eliminating the grain boundaries. Thus, remarkable diminution of the trap density (ntrap: 7.43 × 1011 cm–3) determines a long carrier lifetime (τ2: 1.7 μs) and superior photoelectric performance of MAPbI3-based lateral photodetectors; for instance, an ultrahigh on/off ratio (>2.4 × 106, 2 V), great stability, fast response (283/306 μs), and high detectivity (1.41 × 1013) are achieved. The combination properties and performance of the QSC films surpass most of the reported MAPbI3. This effective approach in growing perovskite QSC films points out a novel way for perovskite-based optoelectronic devices with superior performance.
研究领域:
材料科学
·
光电设备
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 31
·2210878
·
IF 29.4
Wen-Guang Li,Xu-Dong Wang,Yu-Hua Huang,Dai-Bin Kuang
In recent years, halide perovskites have shown great application potential in X-ray detection due to their superior optoelectronic properties and high X-ray attenuation coefficient. However, large-area perovskite fabrication for high performance X-ray detectors remains extremely challenging. Herein, ultrasound-assisted crystallization combined with the hot-pressing method is proposed to prepare large-area (10 cm × 10 cm) and high-quality quasi-monocrystalline thick film of a mixed-cation perovskite MA 0.42 FA 0.58 PbI 3 . The rapid ultrasound-assisted crystallization provides more homogeneous nucleation, which is essential to the fabrication of large-area and uniform perovskite microcrystalline film. Furthermore, the post hot-pressing treatment is implemented to fuse the crystal boundaries, rearrange the crystal grains, and eliminate the voids between crystals, resulting in a quasi-monocrystalline film. After the hot-pressing treatment, the carrier mobility and the carrier mobility-lifetime product increased about 13-fold (from 1.8 to 23.5 cm 2 s −1 V −1 ) and 18 times (from 8.4 × 10 −6 to 1.5 × 10 −4 cm 2 V −1 ), respectively. As a result, a high-performance MA 0.42 FA 0.58 PbI 3 quasi-monocrystalline X-ray detector is achieved with an impressively high sensitivity (1.16 × 10 6 µC Gy air −1 cm −2 ) and low detection limit (37.4 nGy air s −1 ), demonstrating the potential of the ultrasound-assisted crystallization and hot-pressing strategy from an industrial perspective.
研究领域:
材料科学
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医学成像
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
Jiali Peng,Jingao Yang,Zhenglin Jia,Minshu Zhang,Ken Qin,Guan-Hua Dun,Jiahe Zhang,Xiaolong Zhang,Xin Li,Peigen Zhang,Ruolong Zhou,Pengwen Guo,Xiangshun Geng,Sining Pan,Yi Yang,Dan Xie,Qianqian Lin,Tian-Ling Ren
Metal halide perovskites exhibit great promise for utilization in X-ray detection owing to their excellent optoelectronic properties and high X-ray attenuation capabilities. However, fabricating large-area thick films for high-performance perovskite X-ray detection remains challenging. This study develops an in situ crystal growth and fusing-confined approach to prepare high-quality, large-scale perovskite quasi-monocrystalline thick junctions. The perovskite crystals are grown in situ using a highly concentrated perovskite colloidal solution in 2-methoxyethanol. Introducing methylammonium chloride enhances grain reorganization during in situ growth and fusing-confined processes, effectively reducing grain boundaries and surface defects. This allows for the preparation of quasi-monocrystalline thick junctions of large grains (>100 μm) with high crystallinity, uniform orientation, and vertical penetration across the film thickness. Additionally, the carrier mobility and lifetime of the thick junctions are significantly enhanced. The optimized MAPbI3 detectors demonstrate an X-ray sensitivity of 2.6 × 104 μC Gyair–1 cm–2 and an exceptionally low detection limit of 1 nGyair s–1. Furthermore, inspired by a honeycomb structure, these detectors realize X-ray imaging in 64 × 64 pixels through a pixelated separation design, effectively reducing the charge-sharing effect. This study offers valuable insights into the preparation of large-scale perovskite quasi-monocrystalline thick junctions for highly sensitive X-ray detection and imaging applications.
研究领域:
材料科学
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光学工程
·
医学影像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 58
·30573-30578
·
IF 3.708
Jun Wang,Bing Gao,Long Zhang,Rui Li,Jinpeng Shen,Zhiqiang Qiao,Guangcheng Yang,Fude Nie
Two-dimensional Co3O4 nanostructures with porous architectures are experiencing rapid development in functional material fields for their unique structures and properties. Porous Co3O4–C hybrid nanosheet (NS) arrays grown directly on various conducting substrates are synthesized by a controlled method for the first time via a facile hydrothermal synthesis approach in combination with heat treatment. These NS arrays reveal uniform hexagonal morphology and have combined properties of quasi-single-crystallinity and a pore network inside the architecture. A four-step formation mechanism is proposed to understand the growth process of nanosheet arrays grown on the substrate based on the change of morphology. Both the concentration of Co2+ and poly(vinylpyrrolidone) (PVP) play key roles in the formation of NS arrays. When tested as an anode material in lithium-ion batteries, the porous Co3O4–C hybrid NS arrays exhibit improved electrochemical properties of cyclic performance and high coulombic efficiency compared with the commercial Co3O4 and Co3O4/carbon nanocomposites. This approach, porous Co3O4–C NS arrays grown directly on different substrates (wafer, foam, alloy net, foil, especially flexible carbon cloth), provides an efficient route to produce NS arrays to meet the demand for diversity, and may be extended to synthesize other transition metal oxide materials for other applications.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-11
·
IF 5.578
Zhou Yu,Liu Yong,Zhao Wenxia,Wang Hai,Li Baojun,Zhou Xiang,Shen Hui
Transition metal oxides are very promising alternative anode materials for high-performance lithium-ion batteries (LIBs). However, their conversion reactions and concomitant volume expansion cause the pulverization, leading to poor cycling stability, which limit their applications. Here, we present the quasi-single-crystal Ni x Co 3-x O 4 hexagonal microtube (QNHM) composed of continuously twinned single crystal submicron-cubes as anode materials for LIBs with high energy density and long cycle life. At the current density of 0.8 A g −1 , it can deliver a high discharge capacities of 1470 mAh g −1 over 100 cycles (105% of the 2nd cycle) and 590 mAh g −1 even after 1000 cycles. To better understand what underlying factors lead our QNHMs to achieve excellent electrochemical performance, a series of Ni x Co 3-x O 4 products with systematic shape evolution from spherical to polyhedral and cubic particles as well as circular microtubes consisted of spheres and square microtubes composed of polyhedra have been synthesized. The excellent electrochemical performance of QNHMs is attributed to the unique stable quasi-single-crystal structure, which can both provide efficient electrical transport pathway and suppress the electrode pulverization. It is important to note that such quasi-single-crystal structure would be helpful to explore other high-energy lithium storage materials based on alloying or conversion reactions.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
固态化学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Ruoling Wu,Caixia Xu,Ke Ding,Jiarong Zhang,Haibin Sun,Long Xu
Herein, high-quality (006)-oriented and ultrawide bandgap near-stoichiometric lithium niobate quasi-single crystal thin films are prepared using the sol–gel method. The optimal growth condition is investigated by changing the drying and annealing temperatures. The (006)-diffraction pattern of the X-ray diffraction spectra implies the high purity phase of the quasi-single crystal thin films. The molar ratio of the Li and Nb elements is analyzed using X-ray photoelectron spectroscopy and inductively coupled plasma mass spectrometry, confirming that the ratios close to 1:1 are measured. The bandgap of the lithium niobate is approximately 4.4 eV using the Tauc-plot fitting of the absorption spectra, and high-performance solar-blind photodetector based on the ultrawide bandgap lithium niobate thin films is studied. This work paves the way for advancing cost-effective optoelectronic devices based on lithium niobate thin films for UV detection technology.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
薄膜技术
·
晶体生长
·
半导体物理
✓ 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）