Global ETD Search
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 180 for “"nanocrystal"”.
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Quantitative Theories of Nanocrystal Growth Processes
Nanocrystals are an important field of study in the 21st century. Crystallites that are nanometers in size have very different properties from their bulk analogs because quantum mechanical effects become dominant at such small length scales. When a crystallite becomes small enough, the quantum …
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Semiconductor nanocrystal composite materials and devices
… synthesis and characterization of semiconductor nanocrystal (quantum dot, QD) embedded composite materials and possible device applications of the resulting luminescent materials. Chemically synthesized ZnS overcoated CdSe, (CdSe)ZnS, QDs are incorporated into a polymer host material. The main …
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Commercialization of germanium based nanocrystal memory
… the commercialization of germanium-based nanocrystal memories. Demand for smaller and faster electronics and embedded systems supports the development of high-density, low-power non-volatile electronic memory devices. Flash memory cells designed for ten years of data retention require the …
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Electron transport in lead selenide nanocrystal arrays
… properties of arrays of lead selenide (PbSe) nanocrystals (NC's) of approximately 6nm diameter. The films become substantially more conducting when annealed at 400K, although no chemical changes of the capping layer occur at this low temperature. There is no evidence based on TEM images of …
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Metal Chalcogenide Nanocrystal Assembly: From Synthesis To Applications
… synthesized by sol-gel assembly of CdTe nanocrystals with thiolate or nonthiolate (phosphine oxide) ligated surfaces by treatment with tetranitromethane. Both phosphine oxide-capped and the thiolate-capped aerogels exhibit similar structure, morphology and porosimetry properties, …
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Synthesis of silicon nanocrystal memories by sputter deposition
In Silizium-Nanokristall-Speichern werden im Gate-Oxid eines Feldeffekttransistors eingebettete Silizium Nanokristalle genutzt, um Elektronen lokal zu speichern. Die gespeicherte Ladung bestimmt dann den Zustand der Speicherzelle. Ein wichtiger Aspekt in der Technologie dieser Speicher ist die …
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Alternative gate dielectrics and application in nanocrystal memory
Nanocrystal memory has attracted much attention because it has better scalability than the conventional floating gate Flash memory. In this work, the performance of germanium (Ge) nanocrystal memory structures, employing high dielectric constant (high-k) materials to replace the tunnel oxide and …
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Engineering Nanocrystal Devices Through Cation Exchange And Surface Modifications
Colloidal nanocrystals (NCs) are promising materials for electronics and optoelectronics, due to their (i) solution processability; (ii) size-dependent electronic band structures; and (iii) large surface-to-volume ratio. Exploring these features has led to great advances in our fundamental …
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Imaging of nanoparticles and nanocrystal interactions with oxide surfaces
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms
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Large area cellulose nanocrystal self-assembly: towards sustainable pigments
… obtained in vitro by self-assembly of cellulose nanocrystals (CNCs). CNCs are rod-like colloids capable of arranging into a liquid crystalline phase above a critical concentration in suspension. So far, the process that governs the self-assembly of CNCs into photonic structures was studied only …
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Nanocrystal/J-aggregate constructs : chemistry, energy transfer, and applications
… chemistry. Two types of materials, semiconductor nanocrystals and J-aggregates of cyanine dyes, have been developed chiefly due to their potential for interacting with light in interesting and productive ways. At the same time, existing spectroscopy and microscopy tools enable the study of these …
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Hysteresis and memory effects in nanocrystal embedded MOS capacitors
Nanocrystal Memory is a promising new memory type which utilizes silicon nanocrystals and quantum mechanical direct tunneling current for charge storage. This thesis presents the work done to characterize the memory effect in nanocrystal embedded metal-oxide-semiconductor (NC-MOS) capacitors, the …
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Design and synthesis of nanocrystal heterostructures for optoelectronic applications
Colloidal semiconductor nanocrystals can be used for a variety of optoelectronic applications including light emitting devices (LEDs) and photovoltaics. Their narrow emission spectra make them excellent fluorophors for use in red, green and blue emitting organic LEDs and have been shown to achieve …
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Composition, structure, and performance of nanocrystal bulk heterojunction photovoltaics
… between the PbS quantum dots and the titania nanocrystals which compose the blends, the likelihood of forming a truly complete, bicontinuous bulk heterojunction network is maximized at a TiO2-rich blend composition. We find that diffuse interfaces exist between adjacent layers of our devices …
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Protein-mediated nanocrystal assembly for floating gate flash memory fabrication
… between high speed and retention requirement, nanocrystal (NC) floating gate flash has attracted more and more interest recently due to its advantages over traditional flash memories in many areas such as better device scaling, lower power consumption and improved charge retention. However, …
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Solution-Processed Solar Cells via Nanocrystal Inks and Molecular Solutions
On February 15, 2008 the National Academy of Engineering unveiled their fourteen grand challenges of engineering for the 21st century. At the top of the list and voted by the public as the most important challenge was the thrust to make solar energy economical. My research has been dedicated to …
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Nanocrystal Synthesis and Thin Film Formation for Earth Abundant Photovoltaics
… of our time. The fabrication of solar cells from nanocrystal inks comprising earth abundant elements represents a scalable and sustainable photovoltaic technology with the potential to meet the global demand for electricity. Solar cells with Cu2ZnSn(S,Se)¬4¬ (CZTSSe) absorber layers are of …
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Workflows and automated platforms for nanocrystal synthesis, purification, and characterization
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Interband and intraband optical studies of CdSe colloidal nanocrystal films
… results for optical measurements on charged CdSe nanocrystals. The injection of electrons into quantum confined states is confirmed by monitoring changes in the visible and infrared absorption spectra. Interestingly, the response is observed only in the nanocrystals that have been chemically …
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