Journal of Physical Chemistry C
·
2018
·
IF 4.484
Xiangqi Wang,Junbo Gong,Xueyan Shan,Min Zhang,Zilong Xu,Rucheng Dai,Zhongping Wang,Shimao Wang,Xiaodong Fang,Zengming Zhang
During the last few years, the organic–inorganic hybrid methylammonium lead halide perovskite, CH3NH3PbX3 (MAPbX3, X = I–, Cl–, Br–), has received great interest in the field of photovoltaics. Relevant researches develop rapidly due to the excellent properties of MAPbI3, such as high charge mobility, suitable band gap, and long carrier diffusion length. However, the instability of MAPbI3 has been a key issue hindering practical application. Here, we present in situ spectroscopic ellipsometry measurement to monitor the thermal degradation process of MAPbI3. The dynamic evolution of dielectric functions of the as-prepared MAPbI3 films through degradation is extracted by an effective medium approximation model fitting the ellipsometry spectrum. The content proportion of MAPbI3 and PbI2 is also obtained from the modeling results. The thickness of the film decreases in two steps corresponding to the degradation and melting–recrystallization process. The current work shows that ellipsometry provides a potentially fast and non-damage tool to monitor the degradation process and to determine the degree of degradation for MAPbI3 perovskite films. Our work exhibits the first in situ monitoring of the optical properties through the degradation process of MAPbI3 films, which can be consulted for further testing of the degree of degradation for MAPbI3 solar cells and improving the stability of MAPbI3.
研究领域:
材料科学
·
光伏技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Jing Cao,Xiaoyu Xiong,Yuanfeng Liu,Jingbo Sun,Ji Zhou
Laser interference patterning of environment-friendly material with micro/nanoscale surface structures is in high demand for applications. We demonstrated the fabrication of periodic structure in copper-based organic-inorganic hybrid perovskite thin film by 532 nm laser two-beam interference. The extinction coefficient and index of refraction of the copper-based perovskite thin film were characterized by spectroscopic ellipsometry . The morphology of laser-induced structure was investigated by a combination of optical microscopy, scanning electron microscopy, and atomic force microscopy . In addition, the mechanism of the interaction between laser and copper-based perovskite thin film was discussed. This investigation expands the materials selection in laser fabrication and paves the way for optimization towards obtaining micro/nano features for applications in diffractive optics .
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2020
·
IF 2.187
Xiaoyu Sun,Lei Li,Xiaozhuang Xu,Guanyu Song,Jielei Tu,Pingyuan Yan,Weinan Zhang,Kai Hu
Reflection from the surface of solar panels is important factor to limit the efficiency of all of photovoltaic devices . Antireflective coatings (ARCs) can significantly reduce surface reflections and improve photovoltaic module efficiency. But, ARCs on solar glass, used in photovoltaic (PV) modules, usually located in terrible environments, which demands that ARCs must hinder moisture penetration , abrasion damage, and dirt accumulation. In this study, the films with highly antireflective properties that maintains a high durability and hydrophobic were prepared through a simple sol–gel method by using PTFE (Polytetrafluoroethylene) modified. The average transmittance of glass with ARCs was 97.86 % at 400–800 nm, which was an increase of 7.86 % compared to the bare glass. X-ray Diffraction (XRD), Fourier Transform Infrared spectrometer (FT-IR), field emission scanning electron microscope (FE-SEM), ellipsometer , atomic force microscope (AFM), UV–vis-NIR spectrophotometer and water contact angle analyzer were used to measure the surface composition, morphology, refractive index , surface roughness , optical and hydrophilic properties of the coatings. The results revealed that the deposition of PTFE modified SiO 2 coating on the glass substrate had a significant enhance on the antireflection, abrasion-resistance and hydrophobic property.
研究领域:
材料科学
·
太阳能
·
涂层技术
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 7
·2764-2770
·
IF 6.4
Jing Cao,Xiaoyu Xiong,Ji Zhou
Chemically tuned organic–inorganic layered (C4H9NH3)2CuClxBr4−x perovskites have been synthesized and characterized. The crystal structure was investigated by X-ray diffraction (XRD). The morphology was explored by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The chemical structure was studied by Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The thermal stability was determined by thermogravimetric analysis (TGA). The optical properties were investigated by UV-Vis absorption spectroscopy and spectroscopic ellipsometry. Thermochromism in (C4H9NH3)2CuClxBr4−x crystals was observed and the mechanism was determined by a combination of differential scanning calorimetry (DSC), in situ temperature-dependent Raman spectroscopy, and in situ temperature-dependent XRD. This study paves the way to explore the structure–property relationships in two-dimensional perovskites and offers inspiration for the development of eco-friendly thermochromic devices.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）