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 202 for “"Photocurrent"”.
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Quantitative, Photocurrent Multidimensional Coherent Spectroscopy
… same order of magnitude of the sun, and detect photocurrent, instead of optical emission. We show the data with the laser spectrum contribution removed and make some observations on this preliminary data.</p> <p>Finally, we will look at what the lab is working on now. Which is diving deeper into …
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Generation of photocurrent from Photosystem I biomolecular complexes
… proteins are used in organic devices to generate photocurrent. A setup consisting of a monochromator and lock-in amplifiers is used to measure the photocurrent along with an HP4156 analyzer. Atomic force microscopy images are also taken including those taken with a voltage-biased tip. Some devices …
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Probing localized states distributions in semiconductors by Laplace transform transient photocurrent spectroscopy
The structure of the thesis is as follows:<br/><br/>Chapter I addresses the question of how the disorder of non-crystalline semiconductors influences their electronic properties. The concept of the mobility edge and mobility gap is introduced and a definition of the density of electronic states …
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Photocurrent Spectroscopy Study of Graphene / Hexagonal Boron Nitride Moiré Superlattice In the Far-Infrared Regime
… a method named Fourier-transform infrared (FTIR) photocurrent spectroscopy. I will discuss the advantage of this method, and why it is suitable for far-infrared studies of 2D materials. Then I will apply it to the monolayer graphene / hexagonal boron nitride (hBN) moiré superlattices, where I …
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Application and analysis of the constant photocurrent method in studies on amorphous silicon and other thin-film semiconductors
… transient photoconductivity (TPC) and constant photocurrent (CPM) measurements. As a result it is to be found thatthe HWCVD produced material is competitive with the commercially produced PECVD material and shows a tendency to be more resistant against light-soaking as long as significant …
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Modeling of photocurrent spectra induced by nonlinear absorption in high-indium-content iii-nitride disk-in-wire photodiode
… with the transport model to investigate the photocurrent spectrum in the device.
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Light-induced currents from oriented purple membrane
This thesis is a report on photocurrent measurements of purple membrane oriented in an polyacrylamide gel. In the first section, the photocurrent measuring system was frequency analyzed from DC to 100 MHz. The optimized conditions that can measure the photocurrent signal in the 70 ms to 32 ns range …
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Photovoltaic Properties of Ferroelectric Thin Films
… the photovoltaic properties, including photocurrent and photovoltage under UV light illumination. The dynamic responses of photocurrent and photovoltage of the ferroelectric film were also studied to understand how fast these materials could respond to illumination. Our experiments …
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Photoelectric Characterization of Bacteriorhodopsin Reconstituted in Lipid Bilayer Membrane
… of protons across the membrane was measured as photocurrent. For this purpose, a system was built to characterize the lipid bilayer membranes and to measure the photocurrent. The lipid bilayer membrane was characterized by its capacitance and resistance. A picoampere photocurrent was observed …
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Narrowband Photodetection in the Short-wavelength Infrared with a Plasmon-induced Hot Electron Device
… be combined with plasmon-induced hot electron photocurrent generation. This yields a photodetector with a strongly resonant, narrowband photocurrent response in the infrared, limited at low frequencies by the Schottky barrier, not the bandgap of silicon. Here we report a grating-based hot …
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Photoelectrochemical microscopy studies of transition metal dichalcogenides nanoflakes: addressing open questions of structure-function relationships
… laser and the subsequent measurement of the photocurrent. The measured photocurrent can be related to the position of the laser and the physical attributes of the material surface at the location, and variations in the photocurrent across the surface can be tracked. In this way, the technique …
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Relationships Between Proton Translocation, Absorption Changes, and Photocurrents in the Bacteriorhodopsin Photocycle
… steady state and kinetic spectrophotometry and photocurrent methods. First, a kinetic model for the formation of the crucial M intermediate of the photocycle was formulated. The proposed model involved the refinement of previously published kinetic models by including the influence of coupling …
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[Ru-POM] Photo-electrocatalysis
… in electrolyte-free acetonitrile, the overall photocurrent was optimized at 59±0.02 μA through a number of key steps, i.e., electrolyte, potential, etc. This photocurrent is substantially lower than those found for ruthenium dye sensitized TiO2. However, it is important to note that Grıtzel …
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Photoconductivity studies of the ferrocyanide ion under high pressure
… high-pressure mercury lamp. The first-order photocurrent rise-time could be related to the relative quantum efficiency of the photoaquation process, while the dark decay of the photocurrent yielded a relative value of the bimolecular rate-constant for the reverse reaction. Kinetic …
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On the design and synthesis of titanium dioxide-graphene nanocomposites for enhanced photovoltaic and photocatalytic performance
… The integration of graphene increased the photocurrent generated by the TiO2 in response to UV light tenfold. I attribute this enhancement to the ability of RGO to capture photogenerated electrons from TiO2 and conduct them efficiently to a conducting substrate: transient photocurrent …
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Transport properties of NC-Si / A-SiO2 superlattices and their applications in non-volatile memory
… ac conductivity, equivalent capacitance, photocurrent transients of the n-Si/nanocrystalline-Si/amorphous-SiO_2/Al heterostructure were measured in a wide range of illumination intensities for temperatures from 4.2 K to 300 K. Electrical transport properties of the …
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The physics and chemistry of transport in CdSe quantum dot solids
… film preparation can each affect the observed photocurrent by two to three orders of magnitude. In Chapter 4, the methods for CdSe film preparation developed in Chapter 3 are used to make films that exhibit photoconductivity properties consistent with having a low density of trapped charges, in …
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Resonant energy transfer in light harvesting and light emitting applications
… layers. Consequently, a sixfold enhancement of photocurrent conversion efficiency is demonstrated. Photocurrent of the hybrid structure is further improved by replacing the QW heterostructure with a bulk p-i-n heterostructure which has higher carrier transport efficiency. Hence, the photocurrent …
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Development of novel photocatalysts for solar hydrogen production
… 2.00 eV corresponding to an indirect transition. Photocurrent-voltage characteristics recorded under simulated solar illumination indicate that photocurrents are sensitive to annealing temperature and the thickness of the deposit. However, although photocurrent-voltage plots show that electrodes …
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