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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 20 of 85 for “"charge separation"”.
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Charge separation associated with frost growth
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.
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Aspects of spin-charge separation in high Tc cuprates
… which neutral spin 1/2 fermions ("spinons") and charged spinless bosons ("holons") are coupled to gauge fields. If the gauge field is not "confining", the spin and charge degrees of freedom are separated to some extent, and an unconventional picture for transport and magnetic properties is …
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Donor-Acceptor Block Copolymers for Charge Separation at Nanostructured Interfaces
… copolymers. Block copolymers exhibit microphase separation with domain sizes on a nanometer scale by the interplay between immiscibility and molecular connectivity. I used a controlled radical polymerization technique, the nitroxide mediated radical polymerization (NMRP), to get block copolymers …
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The problem of spin and charge separation in condensed matter
In this thesis, we study the problem of spin and charge separation in condensed matter. We focus primarily on Mott insulators at half-filling. It is known that one dimensional strongly correlated electronic systems display the phenomenon of spin and charge separation. We show that there exists a …
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Toward charge separation through conformational control in copper coordination complexes
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
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Spectroscopic study of charge-separation dynamics in [pi]-conjugated systems
… state accessed are identical to those of a charge-transfer state initially formed by a singlet exciton. Finally, we investigated the kinetics of photogenerated excited states in pDTS (FBTTh2)2 :PC70BM photovoltaic devices to monitor the populations of free and trapped charges under different …
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Charge Separation and Its Effect on the Electroreduction of Bis(diethylenetriamine)cobalt(iii)
Made available in DSpace on 2014-12-09T17:36:17Z (GMT). No. of bitstreams: 1 6910847.pdf: 3119017 bytes, checksum: 9fc85ee29020ba19fcfb44ce20c8d680 (MD5) Previous issue date: 1968
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DIRECT REAL-TIME REAL-SPACE IMAGING OF ENERGY TRANSPORT IN ORGANIC SEMI-CONDUCTORS
Efficient energy transport and charge separation in organic semi-conductors are of vital importance in natural light harvesting for photosynthesis and have huge implications for designing a new generation of organic optoelectronic devices such as photovoltaics, light emitting diodes, sensors and so …
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Preparation of Pyridinium and Diaminocarbonium Barbituric Acid Ylides
… have a ylide-type structure with strong charge separation inside the molecule. 5-Ylide-pyridinium-methyl barbituric acid derivatives were investigated with the isolation of 4-dimethylamino-1-(2,4,6-trioxohexahydro- pyrimidin-5-ylide-methyl)-pyridinium as well as its corresponding 1,3- …
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Photophysics of cadmium selenide quantum dot solids
… structure, the optical absorption ~ross-section, charge separation, and transport in cadmium selenide colloidal quantum dots. The electronic states and optical absorption cross-section are found to be less sensitive to changes in the dielectric environment than predicted from theory unless …
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Surface plasmon polariton mediated energy transfer from external antennas into organic photovoltaic cells
… years, the tradeoff between light absorption and charge separation efficiency remains pervasive; increasing light absorption by increasing the device thickness leads to a decrease in exciton diffusion efficiency and vice versa. In this thesis, I demonstrate organic solar cells with an external …
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Spectroscopic Studies of Charge Dynamics in Non-Fullerene Organic Solar Cells
… achieved. Furthermore, they have shown efficient charge separation with negligible energy loss, overcoming one of the crucial limitations of fullerene based OSC. Here, we present a study on the charge generation, separation, and recombination dynamics of non-fullerene solar cells. We investigate …
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The Structure and Function of Chlorophyll-Proteins in Photosystem I and The Light Harvesting Complex of Photosystem Ii
… energy to photochemical reaction centers where charge separation occurs. The structure and function of the chlorophyll-proteins of PS I and the light harvesting complex of PS II have been analyzed to provide information concerning the organization of pigmented proteins in photosynthetic …
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Light-Induced Electron Transfer and Energy Transfer in Thin Polymer Films and Zeolites
… zeolites, which showed promise in maintaining charge separation, were used in this study.
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Nanostructured BaTiO3 Thin Films for Enhanced Photoresponse
… photovoltaic effect (BPV) allows spontaneous separation of photoexcited electron-hole pairs, simplifying device architectures. On the other hand, switchable polarization endows ferroelectric devices with memory and data processing functions. Despite these advantages, several challenges hinder …
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Theoretical investigations of the electronic processes in organic photovoltaics
… related to organic photovoltaics, such as the charge separation processes at the organic/organic interface, which can only be remedied by a combined theoretical and experimental effort. In this thesis we use a variety of computational techniques to address current questions in the field or …
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Understanding Ultrafast Energy Transfer across the Photosynthetic Membrane of Purple Bacteria with Near-Native Systems
… and convert it to chemical energy through charge separation with almost 100% quantum efficiency. This remarkable efficiency is due to the arrangement of their pigments into pigment-protein complexes that are further arranged into a larger antenna network within the membrane environment. …
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Using the Marcus Inverted Region and Artificial Cofactors to Create a Charge Separated State in <i>De Novo</i> Designed Proteins
… protein it is important to create long lived charge separated states. Achieving stable charge separation leads to an increase in the efficiency of the photosynthetic reaction which in turn leads to higher yields of end products, such as biofuels, electrical charge, or synthetic chemicals. In …
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Triplet Exciton Management in Organic Electronic Devices
… dominated by free polarons, suggesting that charge separation may be a mechanism of luminescence quenching at high concentration. In many organic photovoltaic material systems triplets are low-lying states from which charge separation is not energetically favoured. In this thesis, attempts …
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Metal-containing and Metal-free systems for small molecule activation
… 3 to 5 describe a series of compounds with charge-separation feature. These compounds could not only bind CO2 reversibly, but also catalyze the hydroboration of CO2 with a wide borane scope. In Chapter 3, a possible intermediate from the catalytic cycle was isolated and it partly revealed …
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