104 research outputs found
Plasma directed organization of nanodots on polymers: effects of polymer type and etching time on morphology and order
No full textOxygen plasma etching of poly(methyl methacrylate) (PMMA), poly(ethylene terephthalate) (PET), and polystyrene (PS) leads to the formation of organized nanodots on the surfaces of the polymers. In this paper, we describe the metrological characterization of these nanodots and compare their morphology as a function of the polymer type. We study the evolution of the surface morphology with etching time and observe a transition point where dual scale roughness develops, order is lost, and sudden increase in the surface roughness is observed. Possible mechanisms are discussed. <br/
Editorial: Advances on statistical physics of complex systems
No full textΜη διαθέσιμη περίληψηNot available summarizationPresented on
Plasma directed assembly and organization: bottom-up nanopatterning using top-down technology
No full textFabrication of periodic nanodot or nanocolumn arrays on surfaces is performed by top-down lithographic procedures or bottom-up self-assembly methods, which both make use of plasma etching to transfer the periodic pattern. Could plasma etching alone act as an assembly–organization method to create the pattern and then transfer it to the substrate? We present data that support this idea and propose a mechanism of periodicity formation where etching and simultaneous deposition take place
Solution processable tungsten polyoxometalate as highly effective cathode interlayer for improved efficiency and stability polymer solar cells
No full textWe report for the first time the use of a water-soluble, tungsten polyoxometalate H3PW12O40 (PW12-POM) as an efficient cathode interlayer incorporated into poly(3-hexylthiophene):[6,6]- phenyl-C61-butyric acid methyl ester (P3HT:PCBM-61) polymer solar cells. The short circuit photocurrent density of the PW12-POM modified device is enhanced by ∼40% the open circuit voltage increases from 0.61 V to 0.65 V and the fill factor from 0.36 to 0.41, resulting to a power conversion efficiency enhancement of ∼70% (from 1.57% for the reference to 2.7% for the PW12-POM modified device). The improvement is attributed to enhanced electron transfer/extraction at the PW12-POM/Al interface as a result of the favorable interfacial energy level alignment and possible enhancement of the local electric field due to the nanoscale morphology of the PW12-POM layer, as evidenced by AFM measurements. A reduced degradation rate was measured for PW12-POM modified devices stored in dark and measured in ambient conditions. Taking into account the advantageous solution processability of PW12-POM, the large increase in the device efficiency and the improvement of their stability, we manifest that PW12-POM has highly desirable properties in order to be embedded as cathode interlayer in organic photovoltaic cells.</p
Nonhyperbolic escape and changes in phase-space stability structures in laser-induced multiphoton dissociation of a diatomic molecule
No full text
Evaluation of methods for noise-free measurement of LER/LWR using synthesized CD-SEM images
No full textInternational audienc
Lyapunov exponent, stretching numbers, and islands of stability of the kicked top
No full textJournal URL: http://pre.aps.org
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