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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"interdiffused"”.
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Dual Spin-Cast Thermally Interdiffused Polymeric Photovoltaic Devices
An in depth study of the performance of thermally interdiffused concentration gradient polymer photovoltaic devices is carried out with particular attention to the effect of the thickness and the thermal treatments on the power conversion efficiency, short circuit current, open circuit voltage and …
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Structure and properties of the interdiffused phase between lithiated silicon and copper current collector
… interface is not pristine and comprises of an interdiffused Li-Si-Cu interphase structure. To test this hypothesis, the barrier energies for Li diffusion into the assumed crystalline silicide interphase structure separating crystalline Si and Cu is studied. Results show that the barrier …
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Effects of Thickness, Morphology and Molecular Structure of Donor and Acceptor Layers in Thermally Interdiffused Polymer Photovoltaics
… study of concentration gradients in thermally-interdiffused polymer – fullerene photovoltaic devices, with a focus on thickness and heat treatments, is presented in this thesis. Device performance is improved from the bilayer by the creation of a concentration gradient of the donor and acceptor …
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Polymer/Fullerene Photovoltaic Devices - Nanoscale Control of the Interface by Thermally-controlled Interdiffusion
… C60 as the electron acceptor. Interdiffused devices show an order of magnitude photoluminescence quenching with concomitant increase in the photocurrents by an order of magnitude. Variation of the polymer layer thickness shows that the photocurrents increase with decreasing …
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Short-time interdiffusion at polymer interfaces: A probe to study polymer motion
… central half of the chain was deuterated, was interdiffused into a thin layer of similar polymer (DHD), wherein the labeling was reversed, i.e., the two end fractions were deuterated. Since, the total deuteration was equal in both the polymers, initially, the concentration of H and D segments …
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Identification and Characterization of the Iron-Zinc Intermetallics Formed in Galvanneal steel
… steel sheet, in which iron and zinc are interdiffused to form an iron-zinc alloy coating. Within this alloy coating, four main iron-zinc phases, Zeta, Delta, Gamma-1, and Gamma may be present. Manufacture of the most suitable coating requires identifying which phases form during the …
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The Effect of Chemistry and Network Structure on Morphological and Mechanical Properties of Diepoxide Precursors and Poly(Hydroxyethers)
… miscible at elevated temperatures, however the interdiffused region was narrower, ~5 mm. This system showed an increase in the fiber/matrix adhesion similar to that found for the unmodified poly(hydroxyether)/vinyl ester system and composite cyclic fatigue durability was improved by ~50 %. Using …
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Structural characterization of multimetallic nanoparticles
… mixture on alumina above 600°C, the two metals interdiffused, forming two distinct disordered alloys of compositions 30% and 90% Pd. The annealing atmosphere also plays a major role in the structural evolution of these bimetallic nanoparticles. The nanoparticles annealed in forming gas are …
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Mechanics of deformation and fracture of silicon electrodes in high-capacity lithium-ion batteries
… initio calculations were used to reconstruct the interdiffused Li-Si-Cu interphase structure between the lithiated Si electrode and a Cu current collector. Under shear deformation induced by Si expansion, well-delineated and weakly bonded Si-Cu and Li-Cu crystalline atomic layers form within this …