Diting: A polarized time-of-flight neutron reflectometer at CMRR reactor in China

Li, Xinxi; Huang, Congcong; Yan, Wei; Chen, Bin; Sun, G. M.; Liu, Yao-Guang; Gong, Jian; Wu, Kang; Han-gang, Liu

doi:10.1140/epjp/i2016-16407-9

Cited by 17 publications

(6 citation statements)

References 15 publications

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“…It can probe the compositional distribution, precise thickness, and interface roughness of the films in a vertical direction. 30,31 In this work, the TPNR Diting (the Key Laboratory of Neutron Physics, China Academy of Engineering Physics) was carried out for samples A to D.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The neutron reflectivity measurement is an extremely effective method for studying the layered materials as long as the materials possess a characteristic neutron scattering length density (SLD). It can probe the compositional distribution, precise thickness, and interface roughness of the films in a vertical direction. , In this work, the TPNR Diting (the Key Laboratory of Neutron Physics, China Academy of Engineering Physics) was carried out for samples A to D.…”

Section: Resultsmentioning

confidence: 99%

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Understanding the Essential Role of PbI₂ Films in a High-Performance Lead Halide Perovskite Photodetector

Cui

et al. 2020

J. Phys. Chem. C

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Hybrid lead halide perovskites fabricated via solution processing have been regarded as a promising candidate for next-generation optoelectronic devices owing to their outstanding optoelectronic properties and low fabrication cost. However, the morphology, location, and effects of residual PbI 2 in the solution process-based perovskite films are still ambiguous. Herein, by applying the time-of-flight polarized neutron reflectometer (TPNR), we uncover that the highly uniform PbI 2 film locates at the bottom of perovskite films. First-principle calculations demonstrate that the PbI 2 film in the interface between the perovskite film and contact layer can significantly reduce interface charge recombination via the carrier confinement effect owing to the higher conduction band minimum (CBM) and lower valence band maximum (VBM) of PbI 2 than those of the perovskite. To explore the essential role of PbI 2 films in the perovskite, we fabricated a photodetector based on perovskite/PbI 2 (∼534 nm/40 nm) and found its improved performances with a high optical responsivity of ∼1302 AW −1 and a rapid response speed of ∼2 ms, revealing the critical passivation role of PbI 2 . This work provides a rational design strategy for PbI 2 film thickness control in the high-performance planar optoelectronic devices with a varied structure.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Understanding the Essential Role of PbI₂ Films in a High-Performance Lead Halide Perovskite Photodetector

Cui

et al. 2020

J. Phys. Chem. C

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“…We conducted grazing-incidence X-ray reflection (GIXRR), X-ray diffraction (XRD) and internal stress measurements on the periodic multilayer films. High-resolution transmission electron microscopy (HRTEM), high-angle annular dark field (HAADF), selected-area electron diffraction (SAED) and atomic force microscopy (AFM) measurements were performed on the neutron supermirrors prepared under the two different sputtering gas atmospheres, and the neutron reflectivity of an m = 3 neutron supermirror prepared with a nitrogen content of 20% in the sputtering gas was measured using neutron reflectometry (Li et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of the nitrogen content of sputtering gas during Ni deposition on Ni/Ti periodic multilayers and neutron supermirror performance

Zhang¹,

Zhong²,

Ni³

et al. 2023

J Appl Cryst

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Neutron supermirrors are indispensable in neutron research devices. Their performance has been improved using reactive magnetron sputtering. This study investigates the effects of nitrogen content in a mixed sputtering gas during Ni deposition. Ni/Ti periodic multilayers with different d spacings and neutron supermirrors with m = 3 were prepared under different nitrogen partial pressures. Comparison of samples prepared under two different nitrogen contents (12 and 20%) showed that the interfacial roughness and the internal stresses of the periodic multilayer films with 20% nitrogen were smaller, the interface diffusion of the supermirrors with 20% nitrogen decreased, and the interface became clearer and more organized. Furthermore, the neutron reflectivity of the Ni/Ti supermirrors deposited under 20% nitrogen was 0.89 at m = 3.05.

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“…1 High resolution neutron diffractometer (HRND) Xuanwu, 2 residual stress neutron diffractometer (RSND) Qilin, 3 thermal neutron radiography station (TNR), 4 and high-pressure neutron diffractometer (HPND) Fenghuang, 5 are installed in the reactor hall. Small-angle neutron scattering (SANS) Suanni, [6][7][8] time-of-flight and polarized neutron reflectometer (TPNR) Diting, 9 cold neutron triple-axis spectrometer (CTAS) Kunpeng, 10 and cold neutron radiography facility (CNRF) 11 are installed in the cold neutron scattering hall. Moreover, some spectrometers are under construction, such as ultra-small-angle neutron scattering (USANS), spin echo spectrometers, 12 thermal neutron triple-axis spectrometer, polarized SANS (PSANS), and so on.…”

Section: Introductionmentioning

confidence: 99%

MyNeutronDAQ: A general program for data acquisition of neutron scattering spectrometers at China Mianyang Research Reactor and on‐line data‐analysis

Wang

Pang

et al. 2020

Softw Pract Exp

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MyNeutronDAQ, a graphical user interface (GUI) program for data acquisition of neutron scattering spectrometers at China Mianyang Research Reactor (CMRR) and on‐line data‐analysis has been developed. The program is written in Microsoft Visual C++, which runs under Windows operating systems. Based on the characters of the hardware connection and time‐to‐digital converter (TDC) systems of the spectrometers (taking the time‐of‐flight and polarized neutron reflectometer [TPNR] Diting as the example), a valid event identification and screening protocol is embedded into the program. Moreover, the program design and key features of MyNeutronDAQ such as visualization interface, optional output data format, batch mode, and functions of user‐friendly on‐line analysis, are presented. Taking the program specifically for small‐angle neutron scattering (SANS) Suanni as the example, specific applications of the MyNeutronDAQ are further presented.

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Diting: A polarized time-of-flight neutron reflectometer at CMRR reactor in China

Cited by 17 publications

References 15 publications

Understanding the Essential Role of PbI₂ Films in a High-Performance Lead Halide Perovskite Photodetector

Understanding the Essential Role of PbI₂ Films in a High-Performance Lead Halide Perovskite Photodetector

Effect of the nitrogen content of sputtering gas during Ni deposition on Ni/Ti periodic multilayers and neutron supermirror performance

MyNeutronDAQ: A general program for data acquisition of neutron scattering spectrometers at China Mianyang Research Reactor and on‐line data‐analysis

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Diting: A polarized time-of-flight neutron reflectometer at CMRR reactor in China

Cited by 17 publications

References 15 publications

Understanding the Essential Role of PbI2 Films in a High-Performance Lead Halide Perovskite Photodetector

Understanding the Essential Role of PbI2 Films in a High-Performance Lead Halide Perovskite Photodetector

Effect of the nitrogen content of sputtering gas during Ni deposition on Ni/Ti periodic multilayers and neutron supermirror performance

MyNeutronDAQ: A general program for data acquisition of neutron scattering spectrometers at China Mianyang Research Reactor and on‐line data‐analysis

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Understanding the Essential Role of PbI₂ Films in a High-Performance Lead Halide Perovskite Photodetector

Understanding the Essential Role of PbI₂ Films in a High-Performance Lead Halide Perovskite Photodetector