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https://www.readbyqxmd.com/read/28535603/realizing-full-coverage-of-stable-perovskite-film-by-modified-anti-solvent-process
#1
Long Ji, Ting Zhang, Yafei Wang, Peng Zhang, Detao Liu, Zhi Chen, Shibin Li
Lead-free solution-processed solid-state photovoltaic devices based on formamidinium tin triiodide (FASnI3) and cesium tin triiodide (CsSnI3) perovskite semiconductor as the light harvester are reported. In this letter, we used solvent engineering and anti-solvent dripping method to fabricate perovskite films. SnCl2 was used as an inhibitor of Sn(4+) in FASnI3 precursor solution. We obtained the best films under the function of toluene or chlorobenzene in anti-solvent dripping method and monitored the oxidation of FASnI3 films in air...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28535356/one-dimensional-carrier-confinement-in-giant-cds-cdse-excitonic-nanoshells
#2
Natalia Razgoniaeva, Pavel Moroz, Mingrui Yang, Darya S Budkina, Holly Eckard, Marissa Augspurger, Dmitriy Khon, Alexander N Tarnovsky, Mikhail Zamkov
The emerging generation of quantum dot optoelectronic devices offers an appealing prospect of a size-tunable band gap. The confinement-enabled control over electronic properties, however, requires nanoparticles to be sufficiently small, which leads to a large area of inter-particle boundaries in a film. Such interfaces lead to a high density of surface traps which ultimately increase the electrical resistance of a solid. To address this issue, we have developed an inverse energy-gradient core/shell architecture supporting the quantum confinement in nanoparticles larger than the exciton Bohr radius...
May 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28535052/programming-ionic-pore-accessibility-in-zwitterionic-polymer-modified-nanopores
#3
Laura Silies, Annette Andrieu-Brunsen
Creating switchable and gradually tunable pores or channels that display transport control similar to biological pores remains a major challenge in nanotechnology. It requires the generation and manipulation of complex charge situations at the nanoscale and the understanding of how confinement influences chemistry and transport. Here, two different pore sizes, ∼100 nm and less than 10 nm, functionalized with varying amounts of responsive zwitterionic polycarboxybetaine methyl acrylate (PCBMA) give fascinating insight into the confinement controlled ionic transport of pores functionalized with pH-dependent zwitterionic polymers...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28535032/applying-thienyl-side-chains-and-different-%C3%AF-bridge-to-aromatic-side-chain-substituted-indacenodithiophene-based-small-molecule-donors-for-high-performance-organic-solar-cells
#4
Jin-Liang Wang, Kai-Kai Liu, Sha Liu, Feng Liu, Hongbin Wu, Yong Cao, Thomas P Russell
A pair of linear tetrafluorinated small molecular donors, named as ThIDTTh4F and ThIDTSe4F, which are with tetrathienyl-substituted IDT as electron-rich central core, electron-deficient difluorobenzothiadiazole as acceptor units, and donor end-capping groups, but having differences in the π-bridge (thiophene and selenophene), were successfully synthesized and evaluated as donor materials in organic solar cells. Such π-bridge and core units in these small molecules play a decisive role in the formation of the nanoscale separation of the blend films, which were systematically investigated through absorption spectra, grazing incidence X-ray diffraction pattern, transmission electron microscopy images, resonant soft X-ray scattering profiles, and charge mobility measurement...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534919/solid-state-and-surface-effects-in-thin-film-molecular-switches
#5
Jonathan P Hopwood, Jacob W Ciszek
Thin-films of three dihydroindolizine molecular switches were monitored via polarization modulation infrared reflection absorption spectroscopy to quantify solid state and surface-based inhibition of switching as a function of irradiation time. In the solid state, the molecular switches diverged dramatically with flexible alkyl substituents resulting in switching rates up to three times that of switches containing rigid analogs. For thin-films, decreasing film thickness from 30 nm to approximately 4 molecules thick resulted in an increase in inhibition...
May 23, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28534907/inkjet-printed-highly-transparent-and-flexible-graphene-micro-supercapacitors
#6
Szymon Sollami Delekta, Anderson D Smith, Jiantong Li, Mikael Östling
Modern energy storage devices for portable and wearable technologies must fulfill a number of requirements, such as small size, flexibility, thinness, reliability, transparency, manufacturing simplicity and performance, in order to be competitive in an ever expanding market. To this end, a comprehensive inkjet printing process is developed for the scalable and low-cost fabrication of transparent and flexible micro-supercapacitors. These solid-state devices, with printed thin films of graphene flakes as interdigitated electrodes, exhibit excellent performance versus transparency (ranging from a single-electrode areal capacitance of 16 μF cm(-2) at transmittance of 90% to a capacitance of 99 μF cm(-2) at transmittance of 71%)...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534906/configuration-dependent-anti-ambipolar-van-der-waals-p-n-heterostructures-based-on-pentacene-single-crystal-and-mos2
#7
Ji Dong, Fengjing Liu, Feng Wang, Jiawei Wang, Molin Li, Yao Wen, Liang Wang, Gongtang Wang, Jun He, Chao Jiang
Recently, van der Waals heterostructures (vdWHs) have trigged intensive interest due to their novel electronic and optoelectronic properties. The vdWHs could be achieved by stacking two dimensional layered materials (2DLMs) on top of another and vertically kept by van der Waals forces. Furthermore, organic semiconductors are also known to interact via van der Waals forces, which offer an alternative for the fabrication of organic-inorganic p-n vdWHs. However, the performances of organic-inorganic p-n vdWHs produced so far are rather poor, owing to the unmatched electrical property between the 2DLMs and organic polycrystalline films...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534675/gallium-in-depth-profile-in-bromine-etched-copper-indium-galium-di-selenide-cigs-thin-films-inspected-using-raman-spectroscopy
#8
Jacopo Parravicini, Maurizio Acciarri, Alberto Lomuscio, Matteo Murabito, Alessia Le Donne, Andrea Gasparotto, Simona Binetti
In the thin film solar cells domain, copper indium galium (di)selenide (CIGS) is a material with well-established photovoltaic purpose. Here the presence of a suitable [Ga]/([Ga]+[In]) (GGI) in-depth profile has proved to play a key role in the performance of cells. The implementation of a routine method based on reliable but easily available experimental techniques is mandatory to obtain information on the GGI profile of any CIGS layer, in order to achieve high efficiency chalcogenide layers. In this vein, we here propose and systematically test a simple method for the GGI profile determination based on repeated bromine etching of CIGS thin films followed by Raman analysis of the A1 peak position...
June 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28534674/accurate-molecular-orientation-analysis-using-infrared-p-polarized-multiple-angle-incidence-resolution-spectrometry-pmairs-considering-the-refractive-index-of-the-thin-film-sample
#9
Nobutaka Shioya, Takafumi Shimoaka, Richard Murdey, Takeshi Hasegawa
Infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (pMAIRS) is a powerful tool for analyzing the molecular orientation in an organic thin film. In particular, pMAIRS works powerfully for a thin film with a highly rough surface irrespective of degree of the crystallinity. Recently, the optimal experimental condition has comprehensively been revealed, with which the accuracy of the analytical results has largely been improved. Regardless, some unresolved matters still remain. A structurally isotropic sample, for example, yields different peak intensities in the in-plane and out-of-plane spectra...
June 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28534636/annealing-induced-shape-transformation-of-czts-nanorods-based-thin-films
#10
Govind Rajesh, Natarajan Muthukumarasamy, Dhayalan Velauthapillai, Sudip Kumar K Batabyal
Here we studied the annealing induced shape transformation of 1-D Cu2ZnSnS4 (CZTS) nanorods from nanospheres and nanocubes by simple sol-gel method without using any toxic chemicals or complicated vacuum based technology. X-ray diffraction pattern and Raman Spectra reveals the formation of Kesterite structure CZTS thin films. The energy dispersive X-ray analysis results indicate the presence of Cu, Zn, Sn and S. The elemental distribution of all the CZTS samples was studied using elemental mapping. The Hall effect studies of the CZTS thin film composed of nanorods exhibits the lowest resistivity values which indicates efficient charge transfer for unidirectional structure...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28534633/micropatterning-of-multiple-photonic-colloidal-crystal-gels-for-flexible-structural-color-films
#11
Noriyuki Suzuki, Eiji Iwase, Hiroaki Onoe
We herein report the micropatterning of flexible multiple photonic colloidal crystal gels (PCCGs) using single-layered microchannel. These patterned PCCGs exhibit structural colors that can be tuned by adjustment of the diameter and concentration of the colloidal particles in precursor solutions of N-isopropylacrylamide (NIPAM) or polyethylene glycol diacrylate (PEGDA). The precursor solutions containing dispersed colloidal particles were selectively injected into single-layered microchannels where they polymerized rapidly...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28534628/exafs-ab-initio-molecular-dynamics-and-nicis-spectroscopy-studies-on-an-organic-dye-model-at-the-dye-sensitized-solar-cell-photoelectrode-interface
#12
Peng Liu, Viktor Johansson, Herri Trilaksana, Jan Rosdahl, Gunther G Andersson, Lars Kloo
The organization of dye molecules in the dye layer adsorbed on the semiconductor substrate in dye-sensitized solar cell has been studied using a combination of theoretical methods and experimental techniques. The model system is based on the simple D--A dye L0, which has been chemically modified to replace the acceptor group -CN by -Br (L0Br) in order to offer better X-ray contrast. Experimental EXAFS data based on the Br K-edge backscattering show no obvious difference between dye-sensitised titania powder and titania film samples, thus allowing model systems to be based on powder slurrys...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534625/reaction-mechanisms-of-the-atomic-layer-deposition-of-tin-oxide-thin-films-using-tributyltin-ethoxide-and-ozone
#13
Charith E Nanayakkara, Guo Liu, Abraham Vega, Charles L Dezelah, Ravindra K Kanjolia, Yves J Chabal
Uniform and conformal deposition of tin oxide thin films is important for several applications in electronics, gas sensing and transparent conducting electrodes. Thermal Atomic layer deposition (ALD) is often best suited for these applications, but its implementation requires a mechanistic understanding of the initial nucleation and subsequent ALD processes. To this end, in-situ FTIR and ex-situ XPS have been used to explore the ALD of tin oxide films using tributyltin ethoxide and ozone on an OH-terminated, SiO2-passivated Si(111) substrate...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28534409/dimensionality-and-interface-engineering-of-2d-homologous-perovskites-for-boosted-charge-carrier-transport-and-photodetection-performances
#14
Dejian Yu, Fei Cao, Yalong Shen, Xuhai Liu, Ying Zhu, Haibo Zeng
Two dimensional (2D) homologous halide perovskites (HPs) microcrystallines have emerged as promising alternative light-sensitive materials, however, the undesirable quantum confinement effect and severe interfacial charge carrier scattering still hamper their applications in photodetectors (PDs). Here we propose a novel post-synthetic treatment to simultaneously solve both problems. 2D (OA)2FAn-1PbnBr3n+1 (OA and FA represent octadecylamine and formamidine) microplatelets film was immersed into solution containing FA+, leading to improvements in two aspects...
May 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28534407/cdse-nanoplatelet-films-with-controlled-orientation-of-their-transition-dipole-moment
#15
Yunan Gao, Mark C Weidman, William A Tisdale
Using liquid-liquid interfacial assembly, we control the deposition of CdSe nanoplatelets into face-down or edge-up configurations. Controlled assembly, combined with back focal plane imaging, enabled unambiguous determination of the transition dipole orientation. The transition dipole moment of the emissive band-edge exciton in CdSe nanoplatelets was found to be isotropically oriented within the plane of the nanoplatelet, with no measurable out-of-plane component and no preference for the long- or short-axis of the nanoplatelet...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28534391/understanding-electron-transport-in-disk-shaped-triphenylene-tris-naphthaleneimidazole-s-through-structural-modification-and-theoretical-investigation
#16
Yue Zhang, David A Hanifi, M Paz Fernandez-Liencres, Liana M Klivansky, Biwu Ma, Amparo Navarro, Yi Liu
Disk-shaped molecules with large aromatic π-surface are a class of organic semiconductors of which the charge carrier transport properties could be greatly facilitated by preferred intermolecular stacking of the π-surfaces. The optical and electronic properties are not only determined by the core aromatic structure of these disk-shaped molecules, but also strongly dependent on the sidechains, which directly impact the molecular self-assembly behavior in condensed phases. Triphenylene-tris(naphthaleneimidazole) (TP-TNI) is a recently reported n-type semiconductor featuring a large π-core and branched sidechains with an electron transporting mobility reaching 10-4 cm2V-1s-1...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28533872/plain-x-ray-films-in-soft-tissue-infections
#17
Diogo Carrola Gomes, Luísa Quaresma
No abstract text is available yet for this article.
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28533678/effect-of-thermal-pulsation-treatment-on-tear-film-parameters-in-dry-eye-disease-patients
#18
Michelle J Kim, Sandra S Stinnett, Preeya K Gupta
PURPOSE: The goal of this study was to evaluate the effect of thermal pulsation treatment on tear film parameters, specifically osmolarity and matrix metalloproteinase-9 (MMP-9), in patients with meibomian gland dysfunction (MGD) and dry eye disease (DED). METHODS: A single-center review of 189 eyes that underwent thermal pulsation treatment was performed. Data were collected on pre and posttreatment osmolarity, MMP-9, tear break-up time (TBUT), and ocular surface disease index (OSDI) score...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28533392/syringe-injectable-mesh-electronics-integrate-seamlessly-with-minimal-chronic-immune-response-in-the-brain
#19
Tao Zhou, Guosong Hong, Tian-Ming Fu, Xiao Yang, Thomas G Schuhmann, Robert D Viveros, Charles M Lieber
Implantation of electrical probes into the brain has been central to both neuroscience research and biomedical applications, although conventional probes induce gliosis in surrounding tissue. We recently reported ultraflexible open mesh electronics implanted into rodent brains by syringe injection that exhibit promising chronic tissue response and recording stability. Here we report time-dependent histology studies of the mesh electronics/brain-tissue interface obtained from sections perpendicular and parallel to probe long axis, as well as studies of conventional flexible thin-film probes...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533377/engineering-cu-surfaces-for-the-electrocatalytic-conversion-of-co2-controlling-selectivity-toward-oxygenates-and-hydrocarbons
#20
Christopher Hahn, Toru Hatsukade, Youn-Geun Kim, Arturas Vailionis, Jack H Baricuatro, Drew C Higgins, Stephanie A Nitopi, Manuel P Soriaga, Thomas F Jaramillo
In this study we control the surface structure of Cu thin-film catalysts to probe the relationship between active sites and catalytic activity for the electroreduction of CO2 to fuels and chemicals. Here, we report physical vapor deposition of Cu thin films on large-format (∼6 cm(2)) single-crystal substrates, and confirm epitaxial growth in the <100>, <111>, and <751> orientations using X-ray pole figures. To understand the relationship between the bulk and surface structures, in situ electrochemical scanning tunneling microscopy was conducted on Cu(100), (111), and (751) thin films...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
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