Mr. Xuan-yu Zhang Profile

Xuan-yu Zhang

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Proceedings Article | 12 April 2023 Paper

Improved long-term operational stability of optical humidity sensing by mixed-halide perovskite

Xu-liang Feng, Yuan-xun Liu, Zhi-hao Huang, Shui-cong Gu, Xuan-yu Zhang, Zi-jun Sun, Cheng-hua Liang, Hua-jin Chen, Ru-xue Li

Proceedings Volume 12565, 1256514 (2023) https://doi.org/10.1117/12.2661984

KEYWORDS: Humidity, Perovskite, Chlorine, Cesium, Molecules, Bromine, Halogens, Crystals, Environmental sensing

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Halide perovskite (ABX₃) have demonstrated great advantages over conventional semiconductors for the next-generation photoelectronic devices due to their outstanding photophysical properties, such as tunable band gaps, long carrier diffusion length, long carrier lifetime, and high quantum efficiency. In addition, it is also very suitable for humidity sensing because of its environmental sensitivity. However, halogen elements have a great impact on the photophysical properties of perovskite because of their different exchange properties with the environment and mobility. In this work, the samples with three different anions of CsPbCl₃, CsPbBr₃, and CsPb(Br_0.5Cl_0.5)₃ were used, and humidity sensing and stability experiments were carried out in a humidity environment at a relative humidity (RH) of 30%-90%. It is found that the single-anion halide perovskite materials possess low sensitive at low humidity and possess poor stability at high humidity. While the mixed-halide perovskite CsPb(Br_0.5Cl_0.5)₃ demonstrated better sensitivity and reversible in the range of 30%-90% RH. It shows that this is related to the shallow-level defect types of different halide anions, which lead to different phenomena. The ability of different materials to bind water molecules is also an important reason. Therefore, it indicates that the anion-mixed halide perovskite humidity sensor can be used in future environmental detection applications has great potential.

Proceedings Article | 12 April 2023 Paper

Improving optical properties of blue emission perovskite by plasmonic enhancement

Yuan-xun Liu, Xu-liang Feng, Zhi-hao Huang, Shui-cong Gu, Ze-lin Zhou, Xuan-yu Zhang, Xiang-suo Fan, Hong-xia Zheng, Hua-jin Chen, Ya-hong Li, Ru-xue Li

Proceedings Volume 12565, 125653R (2023) https://doi.org/10.1117/12.2663176

KEYWORDS: Optical spheres, Silver, Perovskite, Gold, Solids, Electric fields, Dielectrics, Absorption, Optical properties, Metals

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Halide perovskites (ABX₃) have advantages of high photoluminescence quantum yield (PLQY), high gain coefficient, high carrier mobility and tunable bandgaps, which has great development potential and application prospects in tunable photoelectronic devices. However, blue emission perovskite LEDs lag behind their red and green counterparts in efficiency due to their high defect density and difficulties of maintaining quantum efficiency, which greatly restricts the development of the white light LEDs and display devices. Localized surface plasmon resonance (LSPR) can cause the resonant interactions of electromagnetic waves and free electrons in solid-state materials that have demonstrated great advantages in the field of Raman mapping, photodetector and laser. In addition, photoelectric properties of materials can also be manipulated by it that have great advantages for tunable photoelectric devices. In this work, the finite difference time domain (FDTD) method was used to simulate the extinction spectra of Au or Ag nanoparticles on SiO₂, as well as study the influences of the shape of the nanoparticles on the position of extinction spectral peak. Then the influence of luminescence efficiency of the blue emission perovskite was analyzed by this model. Finally, the optimal optical enhancement structure of BE perovskite was obtained. According to the simulation results, compared with Au and Ag solid spheres, the Ag hollow sphere not only has the best optical enhancement effect on blue emission perovskite, but also has wide tunable ranges that can cover the entire optical band. Therefore, based on the regulation sensitivity of the Ag hollow spheres in the optical band, it provides an effective solution and simulation results for the performance optimization of perovskite-based tunable photoelectronic devices.

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