scholarly journals Direct Fabrication of CsPbxMn1−x(Br,Cl)3 Thin Film by a Facile Solution Spraying Approach

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3242
Author(s):  
Yu Sun ◽  
Jin Chen ◽  
Fengchao Wang ◽  
Yi Yin ◽  
Yan Jin ◽  
...  
Keyword(s):  
Material Properties ◽  
Film Material ◽  
Photoluminescence Band ◽  
Mn Doping ◽  
Coordination Bonding ◽  
Direct Fabrication ◽  
Perovskite Material ◽  
Direct Preparation ◽  
Facile Preparation ◽  
Lead Halide

Nowadays, Mn-doping is considered as a promising dissolution for the heavy usage of toxic lead in CsPbX3 perovskite material. Interestingly, Mn-doping also introduces an additional photoluminescence band, which is favorable to enrich the emission gamut of this cesium lead halide. Here, a solution spraying strategy was employed for the direct preparation of CsPbxMn1−x(Br,Cl)3 film through MnCl2 doping in host CsPbBr3 material. The possible fabrication mechanism of the provided approach and the dependences of material properties on Mn-doping were investigated in detail. As the results shown, Pb was partially substituted by Mn as expected. With the ratio of PbBr2:MnCl2 increasing from 3:0 to 1:1, the obtained film separately featured green, cyan, orange-red and pink-red emission, which was caused by the energy transferring process. Moreover, the combining energy of Cs, Pb, and Mn gradually red-shifted resulted from the formation of Cs-Cl, Pb-Cl and Mn-Br coordination bonding as MnCl2 doping increased. In addition, the weight of short decay lifetime of prepared samples increased with the doping rising, which indicated a better exciton emission and less defect-related transition. The aiming of current work is to provide a new possibility for the facile preparation of Mn-doping CsPbX3 film material.

The Influence of Mn Doping on the Dielectric Properties of Ba0.5Sr0.5TiO3 Ceramics

2016 ◽  
Vol 859 ◽  
pp. 18-23 ◽  
Author(s):  
Li Ping Zhao ◽  
Wen Hong Tao ◽  
Xing Hua Fu ◽  
Wen Zhe Cao ◽  
Guo Yuan Cheng ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Material Properties ◽  
Room Temperature ◽  
Sol Gel ◽  
Barium Nitrate ◽  
Strontium Nitrate ◽  
X Ray Diffraction ◽  
Mn Doping ◽  
X Ray ◽  
Scanning Electron

(Ba0.5Sr0.5)1-xMnxTiO3(x=0,0.01,0.03,0.05)ceramics were prepared via a new sol-gel method with titannium oxide, strontium nitrate, barium nitrate and manganous nitrate as raw materials.The effect of Mn doping on the microstructure and dielectric properties of the BST were characterized by field scanning electron microscopy,x-ray diffraction and impedance analyser.It was found that the dopted ions could not alter the basic crystal strcuture and they only improved the material properties as modified ions when x≤0.3.The (Ba0.5Sr0.5)1-xMnxTiO3 ceramics sintered at 1250°C for 2h exhibited good dielectric properties(er=1330,tand=0.03)at room temperature and f=1KHz when x=0.03 and the grains were regular and uniform ,indicating a dense microstrcture.

Directly Measuring the Adhesive and Elastic Properties of Bacteria using a Surface Force Apparatus: Effect of Desiccation

2006 ◽  
Vol 925 ◽  
Author(s):  
Cheol Ho Heo ◽  
Raina M Maier ◽  
Joan E Curry
Keyword(s):  
Elastic Properties ◽  
Material Properties ◽  
Biofilm Formation ◽  
Surface Force ◽  
Opportunistic Pathogen ◽  
Film Material ◽  
Surface Forces Apparatus ◽  
Adhesive Properties ◽  
Force Profile ◽  
Dry Conditions

ABSTRACTBacterial adhesion is the first step in biofilm formation which impacts numerous environmental, industrial and medical processes. Examples of undesirable consequences of biofilm formation include metal rust, sewage sludge and bacteria-related diseases. Desirable consequences are biofiltration and bioremediation. Bacteria are resilient and can survive in harsh environments. A severe stress is desiccation since dehydration can damage DNA and change the properties of proteins. Some bacteria protect against dehydration by accumulating sugars such as sucrose and trehalose while others undergo a transformation from an active to a dormant state. Evaporative deposition of bacteria on a surface shows that some bacteria aggregate to form two dimensional patterns which may be important for nutrient sharing and survival in dry conditions. Since bacteria are increasingly being employed as components in biosensors and biofilm reactors, it is important to understand the material properties of bacteria in dry conditions for these applications. For a decade, Atomic Force Microscopy (AFM) has been the primary tool used to study the adhesion and elastic properties of individual bacteria. In this work we show it is possible to use a Surface Forces Apparatus (SFA) to measure elastic and adhesive properties of small collections of surface bound bacteria. The measurements are conducted with incomplete, patterned bacterial films and we have developed a protocol to image the contact area with AFM after the experiment. Using the SFA, we measured the force profile between aPseudomonas aeruginosaPAO1 film and a bare mica surface.P. aeruginosaPAO1 is a ubiquitous gram-negative soil bacterium and is also an opportunistic pathogen. We repeated the measurement in the same contact position for six days to determine the effect of desiccation on the film material properties.

Adhesion Asymmetry in Peeling of Thin Films With Homogeneous Material Properties: A Geometry-Inspired Design Paradigm

2019 ◽  
Vol 86 (7) ◽  
Author(s):  
Ahmed Ghareeb ◽  
Ahmed Elbanna
Keyword(s):  
Thin Films ◽  
Material Properties ◽  
Homogeneous Material ◽  
Film Material ◽  
Adhesive Material ◽  
Element Analysis ◽  
Nonuniform Thickness ◽  
Design Paradigm ◽  
Scientists And Engineers ◽  
Compositional Properties

Peeling of thin films is a problem of great interest to scientists and engineers. Here, we study the peeling response of thin films with nonuniform thickness profile attached to a rigid substrate through a planar homogeneous interface. We show both analytically and using finite element analysis that patterning the film thickness may lead to direction-dependent adhesion such that the force required to peel the film in one direction is different from the force required in the other direction, without any change to the film material, the substrate interfacial geometry, or the adhesive material properties. Furthermore, we show that this asymmetry is tunable through modifying the geometric characteristics of the thin film to obtain higher asymmetry ratios than reported previously in the literature. We discuss our findings in the broader context of enhancing interfacial response by modulating the bulk geometric or compositional properties.

Atomistic Origin of Lattice Softness and Its Impact on Structural and Carrier Dynamics in Three Dimensional Perovskites

2022 ◽  
Author(s):  
Zhendong Guo ◽  
Jing Wang ◽  
Wanjian Yin
Keyword(s):  
Material Properties ◽  
Three Dimensional ◽  
Carrier Dynamics ◽  
Defect Tolerance ◽  
Anharmonic Vibration ◽  
Unique Material ◽  
Halide Perovskites ◽  
Polaron Formation ◽  
Lead Halide

The soft lattices of lead-halide perovskites (LHPs) are responsible for their unique material properties, including polaron formation, defect tolerance, anharmonic vibration, and large electrostrictive response, which result in exotic carrier...

Photoluminescence Characterization of Phosphorus Diffusion and Hydrogenation in Continuous Wave Diode Laser Crystallized Si Thin-Film on Glass.

2014 ◽  
Vol 1638 ◽  
Author(s):  
Miga Jung ◽  
Anthony Teal ◽  
Rhett Evans ◽  
Jae Sung Yun ◽  
Sergey Varlamov ◽  
...  
Keyword(s):  
Thin Film ◽  
Hall Effect ◽  
Material Properties ◽  
Continuous Wave ◽  
Bulk Material ◽  
Film Material ◽  
Photoluminescence Intensity ◽  
Hydrogen Passivation ◽  
Phosphorus Diffusion ◽  
Imaging Results

ABSTRACTIn this paper, the effect of phosphorus diffusion and hydrogen passivation on the material properties of laser crystallised silicon on glass is investigated. Photoluminescence imaging, as well as Hall effect and Suns-Voc techniques are applied for the characterisation of laser crystallized silicon thin-film material properties. Hall effect as well as Suns-Voc measurements supports the photoluminescence imaging results; phosphorus diffusion and hydrogen passivation of laser crystallized films improves the overall material quality. Hydrogen passivation is more effective at improving the electronic properties of the laser crystallized films than phosphorus diffusion. Hydrogen passivated samples improved the photoluminescence intensity even further by a factor of 3. In addition, a correlation between photoluminescence intensity and open-circuit voltage is demonstrated: samples with highest photoluminescence intensity (1678 counts/s), gave the highest voltage (530 mV). Hall effect measurement shows a significant improvement in the bulk material, with carrier mobility increasing from 208 cm2/Vs to 488 cm2/Vs.

Photoinduced Mn doping in cesium lead halide perovskite nanocrystals

Nanoscale ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 5247-5253 ◽  
Author(s):  
Tian Qiao ◽  
David Parobek ◽  
Yitong Dong ◽  
Eunsang Ha ◽  
Dong Hee Son
Keyword(s):  
Manganese Ions ◽  
Mn Doping ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Post Synthesis ◽  
Lead Halide

Manganese ions were incorporated into CsPbX3 nanocrystals with their morphology and size preserved using a photo-induced post-synthesis doping method.

scholarly journals Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
David Giovanni ◽  
Marcello Righetto ◽  
Qiannan Zhang ◽  
Jia Wei Melvin Lim ◽  
Sankaran Ramesh ◽  
...  
Keyword(s):  
Exciton Diffusion ◽  
Quantum Confinement Effects ◽  
Förster Energy Transfer ◽  
Perovskite Material ◽  
Nanocrystal Films ◽  
Halide Perovskites ◽  
Photon Recycling ◽  
Lead Halide ◽  
Perovskite Lattice ◽  
Diffusion Properties

AbstractThe outstanding optoelectronic performance of lead halide perovskites lies in their exceptional carrier diffusion properties. As the perovskite material dimensionality is reduced to exploit the quantum confinement effects, the disruption to the perovskite lattice, often with insulating organic ligands, raises new questions on the charge diffusion properties. Herein, we report direct imaging of >1 μm exciton diffusion lengths in CH3NH3PbBr3 perovskite nanocrystal (PNC) films. Surprisingly, the resulting exciton mobilities in these PNC films can reach 10 ± 2 cm2 V−1 s−1, which is counterintuitively several times higher than the carrier mobility in 3D perovskite films. We show that this ultralong exciton diffusion originates from both efficient inter-NC exciton hopping (via Förster energy transfer) and the photon recycling process with a smaller yet significant contribution. Importantly, our study not only sheds new light on the highly debated origins of the excellent exciton diffusion in PNC films but also highlights the potential of PNCs for optoelectronic applications.

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