Morphologically controlled synthesis of ionic cesium iodide colloidal nanocrystals and electron beam-induced transformations

Song, Weidong; Wu, Xiaotong; Di, Qian; Xue, Tianjiao; Zhu, Jichao; Quan, Zewei

doi:10.1039/c8ra02582g

Cited by 11 publications

(6 citation statements)

References 43 publications

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“…We first synthesized the hexagonal CsBr NCs by hot‐injection. [ 41 ] Then the CsBr NCs could be post‐treated with Pb 2+ to achieve the controllable NRs (detailed experiment information is shown in the Experimental Section). The CsBr NCs were obtained for post‐treating by adjusting the reaction time, temperature and centrifugal speed.…”

Section: Resultsmentioning

confidence: 99%

Efficient Interfacial Synthesis Strategy for Perovskite CsPbBr₃ Nanorods in the Biphase Solution

Xie

Cao

et al. 2022

Adv Materials Technologies

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1D APbX3 (A = Cs, MA, FA, X = Cl, Br, I) nanorods (NRs) show potential for the future integrated optoelectronic devices as the ideal building blocks due to their outstanding optoelectronic performances. However, there is still a lack of high‐efficiency controllable strategies to synthesize CsPbX3 NRs. An interfacial synthesis strategy is shown here to fabricate CsPbBr3 NRs by inserting Pb2+ into postsynthetic CsBr nanocrystals in vortex method at the water‐hexane interface. The water phase can intrinsically separate from the hexane phase in such a system and take away excess Pb2+ and other side reaction salts. Additionally, without additional ligand assisted growth, the whole reaction system could result in a very clean surface of CsPbBr3 NRs, eliminating the further purification process. The new approach for interfacial synthesis paves the way for efficient synthesis of CsPbBr3 nanorods.

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Section: Resultsmentioning

confidence: 99%

Efficient Interfacial Synthesis Strategy for Perovskite CsPbBr₃ Nanorods in the Biphase Solution

Xie

Cao

et al. 2022

Adv Materials Technologies

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“…[28] Fortunately, as with LHP, inorganic alkaline halide salt can also be synthesized as a state of nanocrystal colloidal solution, offering alkali metal cations, halogen anions, and ligand-rich liquid environment at mesoscopic scale in the meanwhile. [19,[29][30][31] In 2018, Manna et al reported a transformation from CsX (X = Cl, Br, I) nanocrystals to CsPbX 3 nanocrystals by cation exchange. [30,32] A possible reaction has been proposed: The reaction predicts that under appropriate conditions, such as heat, alkaline halide nanocrystals could release ligand-bonded ions into the environment as a result of its high surface energy as nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Colloidal CsBr Nanocrystals Triggered Inorganic Cation and Anion Exchange Enables High‐Performance Perovskite Solar Cells

Li,

Gao,

Luo

et al. 2023

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Achieving longitudinal doping of specific ions by surface treatment remains a challenge for perovskite solar cells, which are often limited by dopant and solvent compatibility. Here, with the flowing environment created by CsBr colloidal nanocrystals, ion exchange is induced on the surface of the perovskite film to enable the homogeneous distribution of Cs+ and gradient distribution of Br− simultaneously at whole depth of the film. Meanwhile, assisted by long‐chain organic ligands, the excess PbI2 on the surface of perovskite film is converted to a more stable quasi‐2D perovskite, which realizes effective passivation of defects on the surface. As a result, the unfavorable n‐type doping on the top surface is suppressed, so that the energy level alignment between perovskite and hole transport layer is optimized. On the basis of co‐modification of the surface and the bulk, the PCE of champion device reaches 23.22% with enhanced VOC of 1.12 V. Device maintains 97.12% of the initial PCE in dark ambient air at 1% RH after 1056 h without encapsulation, and 91.56% of the initial PCE under light illumination of 1 sun in N2 atmosphere for more than 200 h. The approach demonstrated here provides an effective strategy for the nondestructive introduction of inorganic ions in perovskite film.

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“…Apart from chemical modification, the morphology, crystal structure, chemical composition, and electronic band structure of inorganic materials can be altered by bombarding solids with high-energy particles such as protons, electrons, and γ-radiation. , On irradiation, the energetic particles penetrate through the solid and the projectile energy of the energized particles is transferred to the atoms of the target material through their interaction with the subatomic particles . This process can lead to any of the following events in the material: localized heating, dislocation of the atoms, amorphization, , structural phase transitions, − oxidation/reduction process, − and mechanical changes .…”

Section: Introductionmentioning

confidence: 99%

High-Energy Electron-Beam-Induced Evolution of Secondary Phase and Enhanced Photocatalytic Activity in Monoclinic BiEuWO₆ Nanoparticles

et al. 2019

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A hydrothermally synthesized monoclinic phase of BiEuWO 6 photocatalyst nanoparticles was irradiated with variable doses of high-energy electron beam irradiation (EBI). Structural and morphological changes in unirradiated (referred to as control) and electron-beam-irradiated (referred to as EBI) nanoparticles were characterized by X-ray diffraction, Raman spectroscopy, and field emission scanning electron microscopy. At 50 kGy dose, evolution of a small fraction of a crystalline secondary orthorhombic phase along with a primary monoclinic phase is observed. This is further confirmed by X-ray diffraction as well as Raman spectroscopy. Single-phase and multiphase Rietveld refinements were carried out on the powder X-ray data of the control and EBI samples, and the phase fractions were deduced. Further diffused reflectance spectroscopy, steady-state fluorescence emission spectroscopy, and Brunauer−Emmett−Teller surface area were used to characterize the samples. A significant increase in the visible light photocatalytic activity is observed in the two-phase nanomaterials above an optimum dose of 50 kGy for the degradation of Congo red dye. The structural and morphological implications are investigated in detail to understand the enhancement in the photocatalytic activity of the EBI samples. This work demonstrates the potential of high-energy electron beam irradiation for development of superior crystalline semiconductor photocatalysts.

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Morphologically controlled synthesis of ionic cesium iodide colloidal nanocrystals and electron beam-induced transformations

Abstract: Morphologically controlled synthesis of cesium iodide colloidal nanocrystals.

Cited by 11 publications

References 43 publications

Efficient Interfacial Synthesis Strategy for Perovskite CsPbBr₃ Nanorods in the Biphase Solution

Efficient Interfacial Synthesis Strategy for Perovskite CsPbBr₃ Nanorods in the Biphase Solution

Colloidal CsBr Nanocrystals Triggered Inorganic Cation and Anion Exchange Enables High‐Performance Perovskite Solar Cells

High-Energy Electron-Beam-Induced Evolution of Secondary Phase and Enhanced Photocatalytic Activity in Monoclinic BiEuWO₆ Nanoparticles

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Morphologically controlled synthesis of ionic cesium iodide colloidal nanocrystals and electron beam-induced transformations

Abstract: Morphologically controlled synthesis of cesium iodide colloidal nanocrystals.

Cited by 11 publications

References 43 publications

Efficient Interfacial Synthesis Strategy for Perovskite CsPbBr3 Nanorods in the Biphase Solution

Efficient Interfacial Synthesis Strategy for Perovskite CsPbBr3 Nanorods in the Biphase Solution

Colloidal CsBr Nanocrystals Triggered Inorganic Cation and Anion Exchange Enables High‐Performance Perovskite Solar Cells

High-Energy Electron-Beam-Induced Evolution of Secondary Phase and Enhanced Photocatalytic Activity in Monoclinic BiEuWO6 Nanoparticles

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Efficient Interfacial Synthesis Strategy for Perovskite CsPbBr₃ Nanorods in the Biphase Solution

Efficient Interfacial Synthesis Strategy for Perovskite CsPbBr₃ Nanorods in the Biphase Solution

High-Energy Electron-Beam-Induced Evolution of Secondary Phase and Enhanced Photocatalytic Activity in Monoclinic BiEuWO₆ Nanoparticles