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 89 for “"Diffusion length"”.
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Developing cuprous oxide thin film characterization techniques to illuminate efficiency-limiting mechanisms in photovoltaic applications
… lifetime >10 nanoseconds, minority carrier diffusion length could easily exceed the film thickness. The photoelectrochemical minority carrier diffusion length measurement achieves success on gallium arsenide test samples, determining flat-band potential, quantum efficiency, and minority …
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Nanostructured photovoltaics : improving device efficiency and measuring carrier transport
… QD diodes to measure the bulk minority carrier diffusion length (Lbulk). Lbulk was extrapolated by comparing the effective diffusion length measured at different beam energies. EBIC injection leads to high-level injection conditions, therefore a lower bound for the hole diffusion length in …
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Carrier transport properties measurements in wide bandgap materials
… examines the carrier transport properties, diffusion length, effective carrier lifetime, and resistivity in two wide bandgap materials, GaN and diamond. A combination of two methods was used to obtain these transport properties. The two were optical beam induced current (OBIC) and electron …
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Area-schedule based design of high pressure recovery radial diffusion systems
… entry region. A design framework for radial diffusion systems is developed based on area scheduling the vaned diffuser. The vaned diffuser and volute designs are assessed numerically through RANS calculations and validated by full-scale compressor experiments. The investigations revel that it …
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The design and construction of a laboratory facility for the measurement of reactor moderator parameters
… horizontal and vertical traverses. By means of a diffusion length measurement, which gave an "L” of 54.5 ± 2 cm, and a Fermi Age measurement, which gave a "r” of 357 ± 5 cm², the parameters of the pile were shown to be in good agreement with published data on graphite.
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Spin transport in few-layer graphene
… there is still disagreement regarding the spin diffusion length (lsf). This is partially because insufficient attention has been paid to the micromagnetics of the electrodes, particularly regarding the interpretation of local magnetoresistance (MR), where the spin-valve signal can be confused …
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Organic solar cells based on liquid crystalline and polycrystalline thin films
… is often limited due to small exciton diffusion lengths and poor transport properties which may be attributed to the amorphous nature of most organic semiconductors.Discotic liquid crystal (DLC) copper phthalocyanine was investigated as an easily processible building block for solar …
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Defect characterization of antimonide-based type-II superlattices for infrared detection
… use for the detection of mid- to long-wavelength infrared (MWIR, LWIR) radiation. The type-II broken band gap alignment of these heterostructures allows electrons and holes to be confined in separate but adjacent, nanometer scale thickness, material layers. When arranged in a highly …
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A Monte Carlo analysis of neutron thermalization in graphite
… such as Fermi Age, slowing dotm time, and diffusion length in graphite will be measured using the pulsed source method. This thesis is a Monte Carlo calculation of the results to be expected in such an experiment. The neutron flux and energy spectrum was calculated at 1, 2, 5, and 10 …
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Laser beam induced current studies of Hg1-xCdxTe photodiodes
… of the LBIC problem using the full drift-diffusion and φ,ψ treatment of an n-on-p photodiode together with supporting experimental measurements have revealed a wealth of hidden physical mechanisms, quantifiable relationships, and conditions with which to characterize the p-n junction. A …
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Analysis of Pore -Scale Nonaqueous Phase Liquid Dissolution in Etched Silicon Pore Network
… coefficient decreased because the average diffusion length adjacent to NAPL blobs increased.
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Nonequilibrium energy transport in heterogeneous nanoscale semiconductors
… CdSe QD thin film interface to measure exciton diffusion length.
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Spin Transport in Organic Semiconductors
… spin transport materials with both long spin diffusion length and spin lifetime which is important for spintronics applications. This dissertation explores the spin transport in organic semiconductors using a variety of experimental techniques from all electrical spin injection and detection …
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Some effects on polymers of low-energy implanted positrons
… the item 1., the thermal and epithermal positron diffusion length, the efficiency for the emission of Ps by picking up an electron from the surface, and in the case of PMMA, the bulk Ps fraction and the diffusion length of p-Ps and ortho-positronium are obtained.
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Magnetism and spin transport studies on indium tin oxide
… were carried out to estimate the spin diffusion length of ITO at room temperature. In conjunction with a simplified Valet-Fert model, a spin asymmetry ratio for Co of 0.55 and spin diffusion length of 6±1 nm in semiconducting ITO at room temperature was estimated. These findings imply …
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Development of an Enzyme-Linked ImmunoSorbent Assay (ELISA) with Enhanced Sensitivity in a Nanofluidic System
… by convective transport of analytes, instead of diffusion or reaction. We also found that enzymatic reactions in nanochannels were very effective due to short diffusion length and high surface area to volume ratio. A bead based ELISA was developed to exploit the rapid binding reactions in the …
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Concept and feasibility study of self-organized electrochemical devices
… required, and 2) the decrease in Li ion diffusion length between the cathode and anode. The sign of the Hamaker constant (A₁₂₃) determines either attraction (+) or repulsion(-) where material 2 is the intervening material between materials 1 and 3.
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Growth and properties of hydrogenated amorphous silicon carbon alloys by DC reactive magnetron sputtering
… DOS, Urbach energy E$\rm\sb{U},$ ambipolar diffusion length L$\rm\sb{h},$ photoconductive mobility-lifetime product $\mu\tau$ and dark conductivity $\rm\sigma\sb{D}$ for Tauc bandgap E$\rm\sb{g}\approx$ 1.90 eV. We attribute the quality of these films to the translational energy of the RMS …
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Contact thermal lithography
… feature size is proportional to the wavelength of light used in the exposure process, thermal lithography is limited by a thermal diffusion length scale and the geometry of the situation. In this thesis the basic principles of thermal lithography are presented. A traditional chrome-glass …
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Magnon Transport in Insulating Magnetic Thin Films
… transport measurements, we studied magnon diffusion in MAFO along different crystallographic axes in both the uniformly magnetized state under applied magnetic field and multi-domain state near zero field. In the uniformly magnetized state, we observed a significant anisotropy (30%) in the …
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