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 36 for “"n-doped"”.
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Experimental characterization and computational modeling of N-doped Carbon Dots for future optoelectronic applications
The rising demand for more environmental-friendly and cost-effective fluorophores in optoelectronics and photonics pushed the research on alternatives free of semiconductor elements or rare-earth-based materials. A promising green and low-cost alternative is currently represented by carbon-based …
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A study of the creation and characterization of nitrogen doped CuInSe2 (CIS:N), as a potential improved back contact material for CdTe and Cu(IN_xGA_1-x)Se2 photovoltaic cells
… morphology and electronic properties of these N doped materials, as it is affected by nitrogen, are studied, both in films grown with nitrogen, and in films implanted with nitrogen.
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Organische p-i-n Solarzellen
… the active region is sandwiched between two doped wide-gap layers. The term p-i-n means here a layer sequence in the form p-doped layer, intrinsic layer and n-doped layer. The doping is realized by controlled coevaporation using organic dopants and leads to conductivities of 10-4 to 10-5 S/cm …
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Laser Vaporization Methods for the Synthesis of Metal and Semiconductor Nanoparticles; Graphene, Doped Graphene and Nanoparticles Supported on Graphene
… semiconductor nanoparticles, graphene, B- and N-doped graphene, and metal and semiconductor nanoparticles supported on graphene. These methods include the Laser Vaporization Controlled Condensation (LVCC) approach, which has been used in this work for the synthesis of: (1) gold nanoparticles …
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Formation Mechanisms and Photocatalytic Properties of ZnO-Based Nanomaterials
… reduced graphene oxide (RGO), and supporting N-doped ZnO on N-doped RGO. ZnO-based nanostructures were studied systematically through the entire process from synthesis and characterization to their use as photocatalysis. This allows for a thorough understanding of the parameters that impact …
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Light Emission and Charge Transport in Reverse Biased Polymer Junctions
… zone was observed to shift into the previously n-doped region. Optical and SEM imaging revealed that significant material loss had occurred in the process. The material loss led to the formation of electrical trees in the n-doped region. We conclude that the treeing was caused by hot electron …
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Angle-resolved photoemission studies of topological thin films and superconducting heterostructures
… that each film prepared on Nb is slightly n-doped and bulk insulating by design, in both the bulk and ultrathin-film limits. Using ultrahigh-resolution laser-ARPES, proximity-induced superconducting gaps in the (Bi{1-x}Sbx)2Te3/Nb system are measured as a function of TI film thickness and …
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Thermal properties of graphene
… In this study, thermal properties of p and n doped graphene nanosheets and nanoribbons are studied as function of percentage composition of the dopants and the direction of dissipation of heat flux. Phonon dispersion spectra are presented for these structures using Materials Studio. Non- …
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Fabrication and Characterization of a Palladium/Porous Silicon Layer
… is an electrochemical process; and which type of doped silicon used is one of its key parameters. For nearly all reported porous silicon gas sensors, the silicon has been of the p-doped variety – because p-doped porous etching is better understood and the layers that result from it are more …
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Processing of CdS/CdTe solar cell and the growth model of CdTe thin film
… p-n heterojunction structure containing a p-doped CdTe layer and n-doped cadmium sulfide (CdS) layer, which acts as a window layer. Cadmium Sulfide (CdS) thin films are often deposited on glass substrates coated with TCO layers by the close-spaced sublimation (CSS) or sputter techniques in …
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Effects of doping single and double walled carbon nanotubes with nitrogen and boron
… and boron. We describe the synthesis of N-doped single-walled carbon nanotubes (N-SWNTs), that agglomerate in bundles and form long strands (<10cm), via the thermal decomposition of ferrocene/ethanol/benzylamine (FEB) solutions in an Ar atmosphere at 950°C. Using Raman spectroscopy, we …
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Application of scalable and inexpensive modification on carbon in clean technologies
… on developing electrocatalysts for ORR via N-doped carbon. A new type of graphitic carbon with a unique structure (crumbled balls with turbostratic multi-layer graphene sheets) produced by a high-temperature gas detonation process is explored for N-doping via a post-growth thermal annealing …
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Computational Study of Carbon-Based Low-Dimensional Materials on Structures, Properties and Applications
… the exploration of the energy conversion with N-doped carbon materials as effective catalysts in electrochemical reduction of CO2. Lastly, the simplified model- jellium model- has been applied in carbon nanotube growth. The termination effect and the chiral selectivity in CNT growth have been …
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Organic p-i-n Homojunctions: Fundamentals and Applications
… this thesis, we study the physical properties of doped organic semiconductors. We first demonstrate the impact of doping on C60 films. In contrast to previous reports for organic thin films, the n-doped C60 films show a decrease of mobility with increasing doping levels; i.e., they follow the …
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Thermally-actuated piezoresistively-sensed mechanical silicon oscillator
… when oriented along the <100>direction in an n-doped Si wafer, show large negative piezoresistance coefficients. Beyond significant threshold DC current densities (GA/m 2 ), the thermal-actuation and piezoresitive-feedback loop excite the mechanical structure, causing spontaneous oscillations. …
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Non-Precious Metal-Based Electrocatalysts from Prussian Blue Analogues for Energy-Related Reaction
… stage, the NiFe alloy covered with a discrete N-doped graphitic shell derived from PBA-NiFe for the OER was reported. It was found that the alloy core@discrete graphitic shell structure exhibits enhanced OER activity and stability, even superior to Ir/C. Detailed studies prove that the nitrogen …
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The development of novel passive and active photonic-crystal devices
… by patterning microcavity waveguides into p-i-n-doped epitaxial heterostructures. The compact photonic-crystal laser is anticipated to have impact on the integration of optical devices on the same chip.
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Characterization of type-II GaSb quantum rings in GaAs solar cells
… in this work. Devices with 5 layers of delta doped QRs placed in the intrinsic, n and p regions of a GaAs solar cell are experimentally investigated and the deduced values of Jsc, Voc, Fill factor (FF), efficiency (η) are compared. A trade-off is needed to minimize the Voc degradation while …
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Bioelectrochemical Systems: Microbiology, Catalysts, Processes and Applications
… 5, three cathode catalyst (i.e., N- and S- co-doped porous carbon nanosheets, N-doped bamboo-like CNTs and MoS2 coated on CNTs) have been synthesized and showed effective catalysis of oxygen reduction reaction or hydrogen evolution reaction in BES. Chapter 6, 7 and 8 have demonstrated how BES …
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