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Your search keyword '"Ci, Zhipeng"' showing total 258 results
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258 results on '"Ci, Zhipeng"'

11. Non-Centrosymmetric Chiral Structures for Hybrid Bismuth Halides With Stable Self-Driven X-Ray Detection

Author

Lei, Yutian, Li, Yumin, Peng, Guoqiang, Xu, Youkui, Wang, Haoxu, Fan, Hengzhong, Zhang, Yongsheng, Ci, Zhipeng, Li, ZhenHua, Wang, Qian, and Jin, Zhiwen

Abstract

Self-driving X-ray detectors have the advantages of low energy consumption, portability, and light weight. However, a complex heterostructure system must be constructed to generate a built-in electric field capable of driving carriers in many scenario. Here, we have pioneered the consideration of spatially breaking the symmetry of crystals, thereby giving them the ability to self-drive carriers, known as the bulk photovoltaic effect (BPVE). Specifically, ( ${R}/{S}$ -MPZ) $^{{2}+}$ ( ${R}/{S}$ -MPZ $={R}/$ S-2-Methylpiperazine) chiral ions were introduced to deinduce the crystallization of ( ${R}/{S}$ -MPZ)BiI5 in the non-centrosymmetric P $2_{{1}} 2_{{1}} 2_{{1}}$ space group. In this framework, the position of the electron cloud in real space is displaced by X-ray irradiation, resulting in self-driving behavior. As a result, our X-ray detectors exhibit a sensitivity of $54~\mu $ C Gy $_{\text {air}}^{-{1}}$ cm $^{-{2}}$ and an ultralow detection limit of 18.4 nGyair s $^{-{1}}$ under zero bias. $^{^{^{}}}$ In addition, they feature long-term stability over half a year and impressive imaging performance.

Published
2024
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13. Manganese (II) Halides for X‐Ray Imaging and Moisture Detection.

Author

Jiang, Rui, Peng, Guoqiang, Li, Qijun, Wang, Haoxu, Ci, Zhipeng, and Wang, Qian

Subjects
X-ray imaging, X-ray detection, MOISTURE, MANGANESE, METAL halides, SCINTILLATORS
Abstract

Organic–inorganic hybrid metal halides are widely used in X‐ray detection and imaging due to their high X‐ray absorption efficiency, ease of synthesis, and efficient luminescence. However, the issue of lead toxicity remains a concern. In this study, non‐toxic, 0D 2,2′‐(Ethylenedioxy)bis(ethylamine) manganese (II) bromide (EDBEMnBr4) is synthesized using the simple mechanical grinding method and the solution method that exhibits intense green emission at ≈525 nm. Moreover, the change of structure under the influence of temperature and water significantly affects its fluorescence color under UV light. Scintillator materials with and without moisture exposure showed spatial resolutions of 7 and 4 lp mm−1, and low detection limits of 4.62 and 5.25 µGyair s−1, respectively, meeting medical industry standards (<5.5 µGyair s−1). Furthermore, based on the apparent change in luminescence color triggered by moisture for EDBEMnBr4, a preliminary attempt is made to apply it to humidity monitoring showing that the boundary of color change has a good linear dependence on humidity and time. This work provides new opportunities for Mn‐based metal halides in both X‐ray detection as well as moisture detection. [ABSTRACT FROM AUTHOR]

Published
2024
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46. A Novel Multiple‐Ring Aromatic Spacer Based 2D Ruddlesden–Popper CsPbI3 Solar Cell with Record Efficiency Beyond 16%.

Author

Yao, Huanhuan, Li, Zhizai, Shi, Chang, Xu, Youkui, Wang, Qian, Li, ZhenHua, Peng, Guoqiang, Lei, Yutian, Wang, Haoxu, Ci, Zhipeng, and Jin, Zhiwen

Subjects
SOLAR cell efficiency, QUANTUM confinement effects, BINDING energy, HYDROGEN bonding interactions, CONDUCTION bands
Abstract

Two‐dimensional (2D) Ruddlesden–Popper (RP) CsPbI3 perovskite possesses superior phase stability by introducing steric hindrance. However, due to the quantum and dielectric confinement effect, 2D structures usually exhibit large exciton binding energy, and the charge tunneling barrier across the organic interlayer is difficult to eliminate, resulting in poor charge transport and performance. Here, a multiple‐ring aromatic ammonium, 1‐naphthylamine (1‐NA) spacer is developed for 2D RP CsPbI3 perovskite solar cell (PSC). Theoretical simulations and experimental characterizations demonstrate that the 2D RP CsPbI3 perovskite using 1‐NA spacer with extended π‐conjugation lengths reduces the exciton binding energy and facilitates the efficient separation of excitons. In addition, its cations have a significant contribution to the conduction band, which can reduce the bandgap, promote electronic coupling between organic and inorganic layers, and improve interlayer charge transport. Importantly, the strong π–π conjugation of 1‐NA spacer can enhance intermolecular interactions and hydrogen bonding, and prepare high‐quality films with preferred vertical orientation, resulting in lower defect density, and directional charge transport. As a result, the (1‐NA)2(Cs)3Pb4I13 PSC exhibits a record 16.62% performance with enhanced stability. This work provides an efficient approach to improve charge transport and device performance by developing multiple‐ring aromatic spacers. [ABSTRACT FROM AUTHOR]

Published
2022
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