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13 results on '"Yuan Weinan"'

4. Controllable CsxFA1–xPbI3 Single-Crystal Morphology via Rationally Regulating the Diffusion and Collision of Micelles toward High-Performance Photon Detectors

Author

Yi Long, Haodi Wu, Huanyong Li, Wang Huamin, Yuan Weinan, Jiandong Fan, Guangda Niu, Peng Liu, Yeming Xian, Hang Yin, and Wenzhe Li

Subjects
Photocurrent, Materials science, business.industry, Detector, Photodetector, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Particle detector, 0104 chemical sciences, Responsivity, Optoelectronics, General Materials Science, 0210 nano-technology, business, Single crystal, Diode, Perovskite (structure)
Abstract

Cs xFA1- xPbI3 single crystals are expected to provide more excitement in optoelectronic applications, including photodetector, laser, light-emitting diode, etc. Herein, we aim to gain an in-depth understanding of the growth mechanisms of perovskite single crystal with various morphologies in view of microscopic dynamics by the combination of component, structure, and solvent engineering. A sequence of Cs xFA1- xPbI3 (0 ≤ x ≤ 0.14) perovskite single crystals with a dodecahedron morphology and tunable aspect ratio can be obtained by means of a solution-processed uniform-cooling approach. The optimized Cs0.1FA0.9PbI3 single crystals prepared in γ-butyrolactone mixed with dimethyl sulfoxide are theoretically and experimentally demonstrated to have superior performances, e.g., extremely higher long-term stability, lower trap density, and higher mobility. The broadband absorption, i.e., 300-910 nm, enables its application in near-infrared detection (880 nm), and the corresponding detector demonstrates higher responsivity at different light intensities and a fast photocurrent response (τ1 = 11 μs, τ2 = 10 μs). Equally important, we also explore the application of optimized Cs0.1FA0.9PbI3 single crystals with a tunable aspect ratio in an X-ray detector and the extremely high sensitivity (2772.1 μC Gyair-1 cm-2 under a bias of 150 V) demonstrates their good potential for radiation detection.

Published
2019
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9. In Situ Regulating the Order–Disorder Phase Transition in Cs 2 AgBiBr 6 Single Crystal toward the Application in an X‐Ray Detector

Author

Peng Liu, Wang Huamin, Wenzhe Li, Yuan Weinan, Jiandong Fan, Yeming Xian, Hang Yin, Haodi Wu, and Guangda Niu

Subjects
Biomaterials, In situ, Phase transition, Materials science, Electrochemistry, X-ray detector, Order (group theory), Condensed Matter Physics, Microstructure, Single crystal, Molecular physics, Electronic, Optical and Magnetic Materials
Published
2019
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11. Controllable CsxFA1–xPbI3Single-Crystal Morphology via Rationally Regulating the Diffusion and Collision of Micelles toward High-Performance Photon Detectors

Author

Wang, Huamin, Wu, Haodi, Xian, Yeming, Niu, Guangda, Yuan, Weinan, Li, Huanyong, Yin, Hang, Liu, Peng, Long, Yi, Li, Wenzhe, and Fan, Jiandong

Abstract

CsxFA1–xPbI3single crystals are expected to provide more excitement in optoelectronic applications, including photodetector, laser, light-emitting diode, etc. Herein, we aim to gain an in-depth understanding of the growth mechanisms of perovskite single crystal with various morphologies in view of microscopic dynamics by the combination of component, structure, and solvent engineering. A sequence of CsxFA1–xPbI3(0 ≤ x≤ 0.14) perovskite single crystals with a dodecahedron morphology and tunable aspect ratio can be obtained by means of a solution-processed uniform-cooling approach. The optimized Cs0.1FA0.9PbI3single crystals prepared in γ-butyrolactone mixed with dimethyl sulfoxide are theoretically and experimentally demonstrated to have superior performances, e.g., extremely higher long-term stability, lower trap density, and higher mobility. The broadband absorption, i.e., 300–910 nm, enables its application in near-infrared detection (880 nm), and the corresponding detector demonstrates higher responsivity at different light intensities and a fast photocurrent response (τ1= 11 μs, τ2= 10 μs). Equally important, we also explore the application of optimized Cs0.1FA0.9PbI3single crystals with a tunable aspect ratio in an X-ray detector and the extremely high sensitivity (2772.1 μC Gyair–1cm–2under a bias of 150 V) demonstrates their good potential for radiation detection.

Published
2019
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13. In Situ Regulating the Order–Disorder Phase Transition in Cs2AgBiBr6 Single Crystal toward the Application in an X‐Ray Detector.

Author

Yuan, Weinan, Niu, Guangda, Xian, Yeming, Wu, Haodi, Wang, Huamin, Yin, Hang, Liu, Peng, Li, Wenzhe, and Fan, Jiandong

Subjects
ORDER-disorder transitions, SINGLE crystals, PHASE transitions, X-rays, EXCITON theory, DETECTORS, CHARGE carrier mobility
Abstract

The double perovskite Cs2AgBiBr6 single crystal holds great potential for detecting applications because of its low minimum detectable dose rate and toxic‐free merit. Nevertheless, the disordered arrangement of Ag+/Bi3+ usually gives rise to unexpected structural distortion and thereafter heavily influences the photoelectric properties of the Cs2AgBiBr6 single crystal. Herein, phenylethylamine bromide is demonstrated to be capable of in situ regulation of the order–disorder phase transition in the Cs2AgBiBr6 single crystal. The improved ordering extent of alternatively arranged [AgX6]5− and [BiX6]3− octahedra is theoretically and experimentally proven to decrease the defect density and suppress self‐trapped exciton formation, and thereby tune the band gap and enhance the carrier mobility, which consequently promotes its application in an X‐ray detector. The performance of a corresponding detector based on PEA‐Cs2AgBiBr6 single crystal displays superior performances, e.g., longer carrier drift distance, higher photoconductive gain, and faster current response (13 vs 3190 µs). Prominently, the as‐fabricated PEA‐Cs2AgBiBr6 single‐crystal X‐ray detector has an extremely high sensitivity with a value of 288.8 µC Gyair−1 cm−2 under a bias of 50 V (22.7 V mm−1), which largely outperforms those of their counterparts with lower ordering structure. [ABSTRACT FROM AUTHOR]

Published
2019
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