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 27 for “"photovoltage"”.
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The Effects of High Pressure on The Photovoltage Spectrum of Cadmium-Sulfide and Cadmium-Selenide Schottky Diodes
… effects of high pressure to 10 kilobars on the photovoltage spectrum of CdS and CdSe Schottky diodes has been investigated. These diodes exhibit a photovoltage at photon energies less than the energy gap of the semiconductor. This photovoltage is due to excitation of electrons from interface …
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Photovoltaic Properties of Ferroelectric Thin Films
… 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 showed that both the …
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SOLAR ENERGY HARVESTING WITH PHOTOSYNTHETIC PIGMENT-PROTEIN COMPLEXES
… approaches to achieve enhanced photocurrent and photovoltage generation from the natural pigment-protein complexes.
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VISUALIZATION OF CURRENT INDUCED SPIN ACCUMULATIONS IN THE STRONG SPIN-ORBITAL COUPLING MATERIALS
… insulators as well as Pt heavy metal by scanning photovoltage microscopy at room temperature. The spin polarization is along the out-of-plane direction with opposite signs for the two channel edges. The spin lifetime and spin Hall angle can be estimated using this technique. We further study the …
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Light and Charge Management in Optoelectronic Systems
… We introduce a new interpretation of surface photovoltage measurements for these materials and demonstrate control over transport of charge throughout the material. Thereafter, we explore the physical implications of concentrating light. We present a theoretical study detailing it may be …
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Application of scanning micro-tip and UHV Kelvin probes in surface and material characterisation.
… arsenide is investigated by means of surface photovoltage measurements. We have utilised a UHV Kelvin probe to optimise high and low work function materials for hyperthermal surface ionisation (HSI), a new mass spectrometer technique that reduces ion fragmentation.
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Nanostructured BaTiO3 Thin Films for Enhanced Photoresponse
… perovskite ferroelectrics, including the low photovoltage in thin films, slow response, limited absorption in the visible spectrum and substrate-dependent film growth. This thesis addresses these issues by exploring nanostructure engineering strategies using BaTiO3 (BTO) as a representative …
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Photon-assisted spectroscopy of electronic interface states in perovskite oxide heterostructures
… photoassisted spectroscopy techniques: surface photovoltage spectroscopy and photoelectron spectroscopy. This work especially deals with perovskite oxides, namely with the model perovskite strontium titanate (SrTiO3) as a substrate and three differently doped lanthanum manganite thin films …
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Process Dependence of Defects and Dopants in Wide Band Gap Semiconductor and Oxides
… secondary ion mass spectrometry (SIMS), surface photovoltage spectroscopy (SPS), transient surface photovoltage spectroscopy (TSPS), photoluminescence spectroscopy (PLS) and temperature-dependent Hall-effect (TDHE) measurements to investigate the strong process dependence of Li configuration and …
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STUDY AND CHARACTERIZATION OF INNOVATIVE CLEANING METHODS IN MICROELECTRONICS
… were examined non-destructively using Surface Photovoltage (SPV) minority carrier lifetime analysis and, finally, COCOS measurements have been done in order to investigate on Dit, Qtot, Qit, and Vfb after gate oxide process.
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Spectroscopy and Electrochemistry of Nanometre-Scale Plasmonic Gaps
… in NPoM gaps. I extend this work by quantifying photovoltage forming across NPoM junctions and connect this to single atom movement and single molecule spectroscopy. Moving towards chemical reactions, I study the protonation and deprotonation of acidic molecules inside NPoM and find that local pH …
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Designing Planar Silicon Solar Cells for Singlet Fission Sensitization
… versus ion implantation. Complementary surface photovoltage (SPV) measurements on matching optical stacks show evidence of an illumination-induced transient positive charge density at the Tc/ZnPc/oxide/Si interface, consistent with increased field effect passivation. We find that SPV responses …
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Studies on Optically Induced DC-Voltage in Thin Film Structures
… to clearly identify the origin of the detected photovoltages. Further investigations on rectenna configurations and nonlinear optical rectification process showed promising results for photovoltage generation in a broadband scheme. A photodetector that combines polarization sensitivity and …
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The application of the Kelvin probe in materials science.
… methods based on the measurement of the surface photovoltage. We find that both methods yield a lower surface potential and surface charge for iron contaminated wafers compared to a clean sample and therefore can be used as an indicator for chemical contamination on semiconductor surfaces.
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Fabrication and Optoelectronic Characterization of Nanoscale Resonance Structures
… was determined by measuring the photocurrent or photovoltage resulting from incident monochromatic light which was swept through wavelengths from 400 nm to 2000 nm. The previously mentioned Yagi-Uda based device exhibited two maxima in photoresponse at 1110 nm and 1690 nm. Effective wavelength …
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Carbon Nitride and Conjugated Polymer Composite Materials
… Intensity modulated photocurrent (IMPS) and photovoltage (IMVS) spectroscopies were used to study the mechanism of photoprocesses in P3HT:PCBM ([6,6]-phenyl C61 butyric acid methyl ester ) bulk heterojunction organic solar cells at various light intensities. The use of the frequency domain …
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Experimental and Numerical Investigation on Photostrictive Materials for Mems Application
… effects. Incident light generates a large photovoltage due to the photovoltaic effect, and an induced large voltage produces strain due to the converge-piezoelectric effect on the photostrictive materials. Lanthanum modified lead zirconate titanate (Pb, La) (Zr, Ti) O3 ceramic doped with …
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The Effect of Morphology on Carrier Dynamics in Solution Processed Solar Cells
… Semiconductor-CELIV (MIS-CELIV), and Resistance Photovoltage (RPV) are detailed.</p> <p>The photo-CEILV technique is used to probe P3HT devices of varying molecular weights. This material is known to have a microstructure which varies depending on the molecular weight of the polymer. By measuring …
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Surface chemistry research of electronic processes and electronic devices
… the Fe surface. In the second topic, surface photovoltage (SPV) measurements using XPS was utilized for measuring the band bending on organic molecule modified semiconductor surfaces. The interaction between the phthalocyanine dye molecule and different metal oxide powders was measured by the …
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THE ROLE OF NATIVE POINT DEFECTS AND SURFACE CHEMICAL REACTIONS IN THE FORMATION OF SCHOTTKY BARRIERS AND HIGH N-TYPE DOPING IN ZINC OXIDE
… probe force microscopy (KPFM), and surface photovoltage spectroscopy (SPS) to show that surface treatment and processing plays a significant role in the quality, stability, and efficiency of potential next generation devices. This is evident in our results showing that the Zn-polar surface …
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