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.
Results
Showing 1 to 20 of 31 for “"Photocurrents"”.
-
Relationships Between Proton Translocation, Absorption Changes, and Photocurrents in the Bacteriorhodopsin Photocycle
… mutant were investigated. Interestingly, these photocurrents were influenced by the same residues, namely D85 and E204, which affect the photocurrents of the all-trans photocycle.
-
Polarization dependent photocurrents in thin films of the topological insulator Bi₂Se₃
… ion milling, and electron beam metal deposition. Photocurrents across these electrical devices were induced by the manipulation of optics and lasers and measured using low noise electronics. Experimental results revealed that it was indeed possible to induce spin-polarized electrical currents on …
-
Photoelectrochemical and photophysical studies of carbon nanotube and molybdenum disulfide based light harvesting devices
… studies of optical absorption, emission, and photocurrents, new detailed insights on photo-processes were gained for photoelectrochemical conversion.</p> <p>A regenerative donor-acceptor light-harvesting system was introduced and demonstrated to counteract photoinduced degradation of porphyrin …
-
Polymer/Fullerene Photovoltaic Devices - Nanoscale Control of the Interface by Thermally-controlled Interdiffusion
… quenching with concomitant increase in the photocurrents by an order of magnitude. Variation of the polymer layer thickness shows that the photocurrents increase with decreasing thickness down to 70 nm due to charge transport limitation. The choice of layer thickness in organic photovoltaic …
-
Development of novel photocatalysts for solar hydrogen production
… 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 prepared from a suspension of nanoparticulate FeVO4 powders were photo-responsive, these …
-
Transport properties of electrons in potassium bromide
The photocurrents in lightly colored KBr crystals were measured as o function of electric and magnetic fields in the temperature range of 4.2 K to 78 K. The wavelength dependence o£ the photocurrent was determined in the same range of temperature. The symmetry of the conduction band at 4.2 o K was …
-
Synthesis and characterization of metal oxide semiconductors for photoelectrochemical hydrogen production
… As a result, the ZnO:N films exhibit higher photocurrents than ZnO films. p-type ZnO thin films with significantly reduced bandgaps were synthesized by heavy Cu incorporation. ZnO thin films deposited in pure argon ambient lead to polycrystalline films. However, the presence of N_2 in the …
-
Immobilising and Interfacing Poly(Heptazine Imide) Ionic Carbon Nitride for Photo(electro)catalytic Fuel and Chemical Production
… and hydrogen production with record photocurrents and stabilities. State-of-the-art cyanamide-functionalised poly(heptazine imide) (PHI) ionic carbon nitride (NCNCNx) electrodes were produced by co-deposition with indium tin oxide (ITO) nanoparticles, binding agents and conductive …
-
MULTIPHOTON ABSORPTION IN MONOLAYER TRANSITION METAL DICHALCOGENIDES
… theoretical prediction is validated by measuring photocurrents induced by 2PA or 3PA in a 1L-MoS2 photo-detector at room temperature. Theoretical model is also developed to calculate 2PA spectra of other monolayer transition metal dichalcogenides and it reveals the intrinsic nature of 2PA process …
-
Homology Cloning, Heterologous Expression and Characterization of A New Channelrhodopsin
… the primary structure, kinetics of light-induced photocurrents in HEK293 cells, and action spectrum maximum of 520 nm near that of the two previously found <em>Cr</em>ChR1, we named the new channelrhodopsin <em>Ca</em>ChR1. The properties of robust channel activity at physiological pH, fast …
-
Probe of Coherent and Quantum States in Narrow-Gap Based Semiconductors in the Presence of Strong Spin-Orbit Coupling
… detection and measurement of spin polarized photocurrents in InSb films and quantum wells arising from the circular photogalvanic effect, and measurements of the carrier and spin relaxation in InSb and InMnSb structures by magneto-optical Kerr effect and differential transmission. The samples …
-
Tailored diketopyrrolopyrrole-based organic dyes in photoelectrochemical cells for solar fuel synthesis
… the substrate to the corresponding aldehyde with photocurrents sustained over a 26 hour period with high faradaic efficiency. This work demonstrates the construction of stable precious metal-free dye-sensitised photoanodes, capable of outperforming precious metal-based systems. The photoanode was …
-
Noninvasive optical inhibition with a red-shifted microbial rhodopsin
… mediates three-fold higher red light-induced photocurrents than other inhibitory opsins. I describe the design process involved in engineering Jaws, as well as its characterization in vitro, ex vivo, within the awake in vivo rodent brain, and in transgenic mice. Jaws exhibits robust inhibition …
-
An optical data receiver for integrated photonic interconnects
… per clock cycle, and is able to resolve input photocurrents of less than 50,PA at 5-Gb/s with a power consumption of less than 500yW (100fJ/bit). The receiver was fabricated in a 32-nm CMOS process as part of a flexible test vehicle that will demonstrate various optical components and the …
-
Development of indium arsenide quantum dot solar cells for high conversion efficiency
… performance. Spectral response measurements show photocurrents above the GaAs wavelength indicating the contribution from the InAs QDs in the structure. From the I-V measurements, efficiencies for the GaAs control cell, MBE six-stack InAs QD, and MOCVD three-stack InAs QD solar cells are 8.95%, …
-
Characterisation of solution processed zinc oxide quasi-superlattice materials for thin film applications
… at 532 nm, leading to unusually high photocurrents of > 3 mA. Experimental data and theoretical analysis corroborate to suggest the formation of a donor level within the ZnO band gap caused by interstitial doping of Al.
-
Ultrafast Spin-Charge Conversion Schemes in Magnets: THz Time Domain Spectroscopy Study
… the generation of helicity-dependent ultrafast photocurrents in a noncollinear antiferromagnet Mn3Sn. We combine the experimental data with a theoretical approach to relate this discovery to the nontrivial spin ordering of the material.
-
Photodetection and Spectrometry at the Nanoscale
… spectral response functions and measured photocurrents along these nanowires. This platform is highly versatile; operation can straightforwardly be expanded across the infrared to ultraviolet range. Despite their simplicity, these devices are capable of accurate monochromatic and broadband …
-
Enhancing the functionality of photovoltaic and photonic biointerfaces through structuration
… that large electrode surface areas enhance photocurrents by two orders of magnitude, identifying structuration as key design criterion for bioelectrochemical interfaces. Electrodes with micrometer-sized pores allow enhanced direct contact area with bacteria, but with tested cyanobacteria …
-
Soft matter engineering for cellular bioelectronic interfaces
… applications. With an aim to enhance BPV photocurrents through increased electron availability, podDE-FACS was developed to systematically identify rare, highly electrogenic cyanobacteria using Resazurin, a redox-sensitive fluorescent-marker. The platform was used for the isolation, …
Page 1 of 2