Study of humidity on the structure and optical properties of cesium iodide thin film

Liang, Bo; Liu, Shuang; Guo, Liang; Chen, Dejun; Liu, Yong; Zhong, Zhiyong; Xiong, Liufeng

doi:10.1088/1742-6596/680/1/012022

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…In Figure 3b, the the additional absorption at 1721 cm −1 was the characterized absorption ester carbonyl vibration [47,48] . The peaks at 1450 cm −1 were belonged to the stretching frequency of C−H groups and the skeleton vibration from imidazole ring [49] . Through infrared analysis, it is concluded that the ionic liquid was successfully bonded to DK110.…”

Section: Resultsmentioning

confidence: 93%

Adsorption of Acid Orange and Reactive Red by DK110 Loaded Ionic Liquid

Zhang

et al. 2022

Zeitschrift anorg allge chemie

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Wastewater treatment has always been a topic of concern. Adsorption is one of the commonly‐used methods to treat the dye wastewater. In this work, epichlorohydrin and N‐methylimidazole based ionic liquid were bonded to DK110 resin to synthesize a modified resin (ILDK110) loaded with an ionic liquid. Then infrared spectroscopy and thermogravimetric analysis were used to characterize the successful synthesis of ILDK110. The absorption functions of modified resins on reactive red and acid orange under different temperatures, dye concentrations and pH were investigated. The experimental results show that the adsorption amount of ILDK110 increases with the rise of temperature. At 35 °C, the adsorption amount of acidic orange and reactive red reaches 109.45 mg/g and 111.94 mg/g respectively. The pH has little effect on the amount of adsorption. In the whole adsorption process, the adsorption of reactive red and acid orange by ILDK110 was more consistent with Langmuir isothermal model. The adsorption of acid orange is suitable to be described by the first‐order kinetic equation, while the adsorption of reactive red is more suitable by the description of the second‐order kinetic equation. Under experimental conditions, the removal rates of the modified resin on both the two dyes can reach over 99 %. Furthermore, after adsorption, the saturated resin is easy to be eluted with dilute hydrochloric acid solution, and the elution rate is more than 99 %.

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Section: Resultsmentioning

confidence: 93%

Adsorption of Acid Orange and Reactive Red by DK110 Loaded Ionic Liquid

Zhang

et al. 2022

Zeitschrift anorg allge chemie

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“…Most notably, oxygen was present even though the precursors are oxygen-free. CsI is known to be hygroscopic. − Although we stored the films in either dry or inert conditions, they were still exposed to ambient air during transfer and sample preparation. CsHCO 3 reflections appeared in the XRD pattern of the film stored in ambient air for more than a month (Figure S3).…”

Section: Resultsmentioning

confidence: 99%

Atomic Layer Deposition of CsI and CsPbI₃

et al. 2022

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Cesium iodide (CsI) is a well-established scintillator material that also serves as a precursor for all-inorganic halide perovskite solar absorbers, such as CsPbI 3 . However, the lack of conformal and scalable methods to deposit halide perovskite thin films remains a major challenge on their way to commercialization. In this work, we employ atomic layer deposition (ALD) as the key method due to its inherent scalability to large areas and complex-shaped surfaces. We demonstrate two new ALD processes for the deposition of CsI and CsPbI 3 thin films. The CsI process relies on cesium bis(trimethylsilyl) amide (Cs(btsa)) and tin(IV) iodide (SnI 4 ) as precursors and yields high-purity, uniform, and phase-pure thin films. This process works in a wide temperature range (140−350 °C) and exhibits a large growth per cycle value (GPC) of 3.3 Å (85% of a CsI monolayer). Furthermore, we convert CsI into CsPbI 3 perovskite by exposing a CsI film to our earlier PbI 2 ALD process. We demonstrate the deposition of phase-pure γor δ-CsPbI 3 perovskite thin films, depending on the applied deposition temperature and number of PbI 2 cycles. We believe that the ALD-based approach described in this work will offer a viable alternative for depositing perovskite thin films in applications that involve complex high aspect ratio structures or large substrate areas.

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“…Our result is consistent with the experimental results. For 500 nm thick CsI crystal, when it is under long term exposure (24 h), the absorption peak broadens with the band center shifting toward lower wave numbers [ 19 ]. The calculated reflection coefficients are shown in Figure 13 .…”

Section: Discussionmentioning

confidence: 99%

Effect of H2O Molecule Adsorption on the Electronic Structure and Optical Properties of the CsI(Na) Crystal

et al. 2021

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We investigated H2O molecule adsorption that had an effect on the luminescence properties of the CsI(Na) crystal using experiments and first-principle calculations. We measured the emission spectra of the CsI(Na) crystal at different exposure times under gamma ray excitation. The experimental results showed that the energy resolution of the CsI(Na) crystal was worse when the crystal surface adsorbed more H2O molecules, and the crystal surface deliquescence decreased the luminescence efficiency of the CsI(Na) crystal. We studied the band structure, density of states, and optical properties changes caused by H2O molecule adsorption on the CsI(Na) (010) surface. The generalized gradient approximation (GGA) was used to describe the exchange and correlation potential between the electrons. Our calculation results showed that the band gap width of the CsI(Na) (010) surface decreased after adsorbing H2O molecules, while three new peaks appeared in the valence band, and the absorption coefficient decreased from 90,000 cm−1 to 65,000 cm−1, and the reflection coefficient decreased from 0.195 to 0.105. Further, the absorption coefficient was reduced by at least 25% because of H2O molecule adsorption, which led to the luminescence degradation of the CsI(Na) crystal.

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Study of humidity on the structure and optical properties of cesium iodide thin film

Cited by 4 publications

References 14 publications

Adsorption of Acid Orange and Reactive Red by DK110 Loaded Ionic Liquid

Adsorption of Acid Orange and Reactive Red by DK110 Loaded Ionic Liquid

Atomic Layer Deposition of CsI and CsPbI₃

Effect of H2O Molecule Adsorption on the Electronic Structure and Optical Properties of the CsI(Na) Crystal

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Study of humidity on the structure and optical properties of cesium iodide thin film

Cited by 4 publications

References 14 publications

Adsorption of Acid Orange and Reactive Red by DK110 Loaded Ionic Liquid

Adsorption of Acid Orange and Reactive Red by DK110 Loaded Ionic Liquid

Atomic Layer Deposition of CsI and CsPbI3

Effect of H2O Molecule Adsorption on the Electronic Structure and Optical Properties of the CsI(Na) Crystal

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Product

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Atomic Layer Deposition of CsI and CsPbI₃