CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Jianming Lai,Lujia Yang,Wenzhen Wang,Shaohan Wang,Yingshen Lu,Feng Hong,Fei Xu,Junfeng Chen,Yan Zhu,Hui Zhang,Run Xu,Linjun Wang
One-dimensional (1D) CsCu2I3 single crystals (SCs) have been investigated as novel sensitive X-ray and γ-ray scintillators, which can be prepared by the Bridgman method and solution method. However, to date, no research team has studied the scintillation performance of CsCu2I3 single crystals grown using the solution method, and traditionally grown single crystals using the antisolvent method are of poor quality and small sizes. In this work, high-quality CsCu2I3 SC was synthesized with formic acid as an additive by using the inverse temperature crystallization solution method, and its optical properties and scintillation performance were measured. The experimental results indicate that the addition of formic acid can stabilize the growth of crystals in solution, and the selected solvent DMF is beneficial for the growth of rod-like single crystals instead of needle-like single crystals by the DMSO. The experiment resulted in high-quality CsCu2I3 single crystals reaching a length of 13 mm, with no visible inclusions in the crystal. The full width at half-maximum (fwhm) of the X-ray rocking curve was 0.028°, indicating its high crystalline quality. It exhibits stability in air and emits bright yellow light under ultraviolet irradiation. The CsCu2I3 SC shows a much shorter PL decay of 118 ns and afterglow of 0.01% @ 12 ms compared to commercial CsI: Tl single crystal. The light yield of CsCu2I3 SC is 21800 photons/MeV, showing great potential as a scintillation material.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shan-Shan Yan,You-Chao Kong,Zhi-Hong Zhang,Zhi-Sheng Wu,Zhen-Dong Lian,Yun-Peng Zhao,Shi-Chen Su,Lin Li,Shuang-Peng Wang,Kar Wei Ng
Lead-free perovskite has attracted great attention in realizing high-performance optoelectronic devices due to their excellent atmospheric stability and nontoxic characteristics. Although a pronounced ion migration effect has been observed in this new class of materials, its potential in enhancing the overall device performance is yet to be fully explored. In this work, we studied the effect of ion migrations on the carrier transport behavior and found that the recoverable migration process can contribute to enhancing the on/off ratio in a lead-free CsCu2I3 single-crystal microrod-based photodetector. In detail, we synthesized CsCu2I3 single-crystal microrods via an in-plane self-assembly supersaturated crystallization approach. These microrods with well-defined morphologies were then used to construct ultraviolet (UV)-band photodetectors, which outperform most reported lead-free perovskite photodetectors based on individual single crystals. Simultaneously, ion migration can result in asymmetric band bending in the two-terminal device, as confirmed by surface potential profiling with Kelvin probe force microscopy (KPFM). Such an effect can be harnessed to increase the on/off ratio by almost an order of magnitude. Furthermore, the lead-free CsCu2I3 single crystal exhibits excellent thermal and air stabilities. These findings demonstrate that the CsCu2I3 single-crystal microrods can be used in stable and efficient photodetection, and the ion migration effect can potentially be utilized for improving the optoelectronic performance of lead-free devices.
研究领域:
材料科学
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光电材料
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Sancan Han,Xianyu Qiao,Yimin Li,Fei Wang,Dechao Yu,Jingcheng Xu,Songlin Zhuang,Xiaosheng Fang,Dawei Zhang
Heterogeneous integration of various crystalline materials in electronic and optoelectronic devices have fueled the development of two-dimensional (2D) perovskite single-crystalline (SC) film. However, it is still challenging to synthesize 2D CsCu 2 I 3 SC film due to the uncontrolled nuclei/growth. In the work, the bottleneck for the synthesis of 2D CsCu 2 I 3 SC film can be well tackled by the solution supersaturation and external pressure for the first time, meanwhile, the morphological transformation of CsCu 2 I 3 from dendritic crystal to 2D film are firstly achieved through controlling nucleation driving force. The heterogeneous integration of 2D CsCu 2 I 3 SCs film on various substrates was demonstrated, a self-powered GaN-CsCu 2 I 3 SC film photodetector exhibits high rectification ratio of 1250 (±1 V) with improved responsivity of 460 mA W −1 and EQE of 163 %, which outperforms most reported 2D lead-free halide perovskite film photodetectors. Furthermore, theoretical computational calculation was employed to investigate their crystal structure and electronic distribution, evidencing that 2D CsCu 2 I 3 SC film could facilitate the separation of photo-induced carriers. The study not only shows an in-depth mechanism for perovskite growth, but also advances the development of 2D copper-based perovskite film and hetero-integration, laying the groundwork for future commercial optoelectronics.
研究领域:
材料科学
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光电技术
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半导体物理
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 28
·2002634
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IF 16.836
Ziqing Li,Ziliang Li,Zhifeng Shi,Xiaosheng Fang
Low-dimensional metal halides at molecular level, which feature strong quantum confinement effects from intrinsic structure, are emerging as ideal candidates in optoelectronic fields. However, developing stable and nontoxic metal halides still remains a great challenge. Herein, for the first time, high-crystalline and highly stable CsCu 2 I 3 single crystal, which is acquired by a low-cost antisolvent vapor assisted method, is successfully developed to construct high-speed ( t rise / t decay = 0.19 ms/14.7 ms) and UV-to-visible broadband (300–700 nm) photodetector, outperforming most reported photodetectors based on individual all-inorganic lead-free metal halides. Intriguingly, facet-dependent photoresponse is observed for CsCu 2 I 3 single crystal, whose morphology consists of {010}, {110}, and {021} crystal planes. The on–off ratio of {010} crystal plane is higher than that of {110} crystal plane, mainly owing to lower dark current. Furthermore, photogenerated electrons are localized in twofold chains created by [CuI 4 ] tetrahedra, leading to relatively small effective mass and fast transport mobility along the 1D transport pathway. Anisotropic carrier transport characteristic is related to stronger confinement and higher electron density for {110} crystal planes. This work not only demonstrates the great potential of CsCu 2 I 3 single crystal in high-performance optoelectronics, but also gives insights into 1D electronic structure associated with fast photoresponse and high anisotropy.
研究领域:
材料科学
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光电领域
·
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）