scholarly journals Fabrication and characterization of Cs2SnI6 perovskite films using SnI2 and I2 powders as reactants

2021 ◽  
Author(s):  
Saad Ullah ◽  
Peixin Yang ◽  
Ghulam Abbas ◽  
Yongsheng Chen
Keyword(s):  
Optical Properties ◽  
Phase Stability ◽  
Double Perovskite ◽  
Photovoltaic Devices ◽  
Reaction Conditions ◽  
Step Process ◽  
Fabrication And Characterization ◽  
The Impact ◽  
Exceptional Stability

Abstract In the recent years, cesium tin iodide (Cs2SnI6) double perovskite has emerged as a research hotspot in photovoltaics due to its exceptional stability and outstanding optoelectronic properties. In this work, we have utilized a reactant combination of SnI2 and I2 to prepare uniform Cs2SnI6 films via modified two-step process. The impact of the reaction conditions on the structural, morphological and optical properties is explored. It is found that optimizing the reaction conditions improves the phase stability and morphology of the films. The iodine-rich fabrication of the films ensued in enhanced PL and optical characteristics of the Cs2SnI6 with an optimal bandgap in the range of 1.21-1.34 eV. Additionally, we constructed all-inorganic photovoltaic devices FTO/TiO2/Cs2SnI6/Carbon utilizing optimized Cs2SnI6 films.

scholarly journals Gallium phosphide optical metasurfaces for visible light applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mauro Melli ◽  
Melanie West ◽  
Steven Hickman ◽  
Scott Dhuey ◽  
Dianmin Lin ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Visible Light ◽  
Material Properties ◽  
Gallium Phosphide ◽  
Material Selection ◽  
Viable Alternative ◽  
Fabrication And Characterization ◽  
Selection For

AbstractThere are few materials that are broadly used for fabricating optical metasurfaces for visible light applications. Gallium phosphide (GaP) is a material that, due to its optical properties, has the potential to become a primary choice but due to the difficulties in fabrication, GaP thin films deposited on transparent substrates have never been exploited. In this article we report the design, fabrication, and characterization of three different amorphous GaP metasurfaces obtained through sputtering. Although the material properties can be further optimized, our results show the potential of this material for visible applications making it a viable alternative in the material selection for optical metasurfaces.

scholarly journals Review on the Impact of Polyols on the Properties of Bio-Based Polyesters

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2969
Author(s):  
Kening Lang ◽  
Regina J. Sánchez-Leija ◽  
Richard A. Gross ◽  
Robert J. Linhardt
Keyword(s):  
Tissue Engineering ◽  
Biomedical Applications ◽  
Molecular Level ◽  
Potential Utility ◽  
Reaction Conditions ◽  
Wide Range ◽  
Soft Tissue Engineering ◽  
The Impact ◽  
Optimal Reaction

Bio-based polyol polyesters are biodegradable elastomers having potential utility in soft tissue engineering. This class of polymers can serve a wide range of biomedical applications. Materials based on these polymers are inherently susceptible to degradation during the period of implantation. Factors that influence the physicochemical properties of polyol polyesters might be useful in achieving a balance between durability and biodegradability. The characterization of these polyol polyesters, together with recent comparative studies involving creative synthesis, mechanical testing, and degradation, have revealed many of their molecular-level differences. The impact of the polyol component on the properties of these bio-based polyesters and the optimal reaction conditions for their synthesis are only now beginning to be resolved. This review describes our current understanding of polyol polyester structural properties as well as a discussion of the more commonly used polyol monomers.

scholarly journals Fabrication and characterization of perovskite-based CH3NH3Pb1-xAsxI3+xCly photovoltaic devices

2017 ◽  
Author(s):  
Tsuyoshi Hamatani ◽  
Yasuhiro Shirahata ◽  
Yuya Ohishi ◽  
Misaki Fukaya ◽  
Takeo Oku
Keyword(s):  
Photovoltaic Devices ◽  
Fabrication And Characterization

Fabrication and characterization of carboxymethylated bael fruit gum with potential mucoadhesive applications

RSC Advances ◽  
2015 ◽  
Vol 5 (55) ◽  
pp. 44652-44659 ◽  
Author(s):  
Atul Srivastava ◽  
Devegowda Vishakante Gowda ◽  
Umme Hani ◽  
Chetan Govindrao Shinde ◽  
Riyaz Ali M. Osmani
Keyword(s):  
Sodium Hydroxide ◽  
Monochloroacetic Acid ◽  
Reaction Conditions ◽  
Fabrication And Characterization

Carboxymethylation of bael fruit gum was achieved through its reaction with monochloroacetic acid in the presence of sodium hydroxide as a catalyst at different reaction conditions.

Synthesis and Characterization of Nanocrystalline Ba-doped Mn3O4 Hausmannite Thin Films for Optoelectronic Applications

2021 ◽  
Author(s):  
Aus A. Najim ◽  
Kadhim R. Gbashi ◽  
Ammar T. Salih
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Structural Characteristics ◽  
Optical Transmittance ◽  
Degree Of Crystallinity ◽  
Chemical Spray Pyrolysis ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
The Impact

In the present work, nanocrystalline hausmannite Mn3O4:Ba thin films have been deposited on glass substrates by chemical spray pyrolysis (CSP). Then, we investigated the impact of Ba doping concentrations on the structural, morphological and optical properties. The structural characteristics were investigated by X-ray diffraction technique and clearly show the films have a spinel Mn3O4 polycrystalline structure, the degree of crystallinity was improved by increasing Ba concentrations in Mn3O4 matrix with crystallite size range of 15–33[Formula: see text]nm. The lattice parameters, the unit cell volume and the (Mn-O) bond length of tetrahedral and octahedral sites, were varied by increasing Ba concentrations. SEM micrographs show that the films are homogeneous with nanoparticles dispersed on the surface with sizes range 30–132[Formula: see text]nm. The optical properties were estimated by UV-Vis-NIR spectrophotometer and exhibited that the optical transmittance and band gap were improved by increasing Ba doping concentration. Empirical equations were suggested to estimate some correlated variables with excellent agreement with the experimental data. The optimum condition was recorded in films doped with 3% of Ba where a better crystallinity, a preferable surface morphology and outstanding optical properties have been achieved.

Microstructural Characterization of Photoluminescent Porous Silicon

1991 ◽  
Vol 256 ◽  
Author(s):  
J. M. Macaulay ◽  
F. M. Ross ◽  
P. C. Searson ◽  
S. K. Sputz ◽  
R. People ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Porous Silicon ◽  
Microstructural Characterization ◽  
Photoluminescence Spectroscopy ◽  
Experimental Results ◽  
Visible Luminescence ◽  
Wide Range ◽  
The Impact

ABSTRACTWe have used electron microscopy to examine the microstructure of porous silicon films over a wide range of doping levels, and photoluminescence spectroscopy to study their optical properties. We discuss the impact of our experimental results on models from the literature which were proposed to explain visible luminescence from porous silicon.

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