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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 31 for “"space-charge limited"”.
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Voltage and Power Relations in the Space Charge Limited Parallel Plane Diode
Made available in DSpace on 2014-12-04T21:02:29Z (GMT). No. of bitstreams: 1 0002729.pdf: 1907590 bytes, checksum: 046379a158f0d9fd641ed423d9bbea22 (MD5) Previous issue date: 1951
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Drift Mobilities of Electrons and Holes and Space-Charge-Limited Currentsin Amorphous Selenium Films
Made available in DSpace on 2015-05-12T17:12:25Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6200618.PDF: 3668461 bytes, checksum: a69e313dc1581fa54971476212ac9d09 (MD5) Previous issue date: 1961
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SPACE CHARGE LIMITED DIELECTRIC BREAKDOWN, OR: HOW I LEARNED TO STOP WORRYING AND LOVE APPROXIMATIONS
Space charge induced dielectric breakdown in spacecraft components exposed to energetic cosmogenic radiation has remained poorly understood despite decades of research. In this work, breakdown in electron irradiated polymethyl methacrylate is described by a new 1D space charge limited front (SCLF) …
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Space-Charge Saturation and Current Limits in Cylindrical Drift Tubes and Planar Sheaths
Space-charge effects play a dominant role in many areas of physics. In high-power microwave devices using high-current, relativistic electron beams, it places a limit on the amount of radiation a device can produce. Because the beam's space-charge can actually reflect a portion of the beam, the …
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High resolution simulation of a vacuum microdiode
… each electron in the system is regarded as point charge and observed through the system from Cathode to Anode. A space charge limited emission process is simulated. Low voltage sufficies to create large electric field across the vacuum diode since the gap spacing is kept in the micrometer region. …
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Electrical and optical characterisation of bulk heterojunction polymer-fullerene solar cells
… contacts, the current conduction was found to be limited by the low mobilty of P3HT. Trap density was estimated from a space charge limited current model with traps distributed exponentially within the band gap. The efficiency of P3HT:PCBM solar cells improves after thermal annealing, which …
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Numerical modelling of a radio-frequency micro ion thruster
… are utilized for modeling the chamber plasma discharge. A transformer model is incorporated in the equations of energy balance for investigating the effect of plasma on the primary circuit and for calculating the absorbed power by the plasma. A simple and one-dimensional ion extraction model is …
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Degradation mechanisms of barium titanate based thick film capacitors
… paste and high K dielectric has shown ohmic and space charge limited current behavior with a 3/2 power voltage dependence. Voltage independence of thermal activation energy and time dependence of a leakage current have been observed. A healing effect by reversal of bias polarity and humidity …
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Electrical transport properties of barium titanate-based capacitor ceramics
… emphasis on the X7R type were studied. Dominant charge carriers in this material were identified as conduction band electrons below a temperature of 850°C. This was substantiated by the following results: negative Seebeck coefficients, zero galvanic cell voltage, and evidence of space …
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patial Control of the Conductivity of Poly(3,4-ethylenedioxythiopehe): Poly(styrenesulfonate) Thin Films
… fitting the electrical transport theory of space charge limited current carrier transportation through polymeric materials to experimental results, this shift of morphology can be linked to an increase in the effective mobility of carriers in PEDOT:PSS. Characterization subsequent to various …
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Density of gap states in hydrogenated amorphous silicon
… distribution of the films has been deduced from Space Charge Limited Current measurements with an Au/a-Si:H Schottky diode structure. Samples with ('(TURN)) 15.5% at. H have densities of states of 3 x 10('14) states/cm('3) eV and show large majority carrier mobility-lifetime products of 10('-5) …
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"Some properties of silicon p-""i""-n diodes compensated with gold"
… of the devices. A theory based on two carrier space-charge-limited emission into the ""intrinsic"" region of the devices i~ developed to explain the cubic dependence of the current density on applied voltage. This theory is in excellent agreement with experimental results. Properties and …
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Intrinsic degradation mechanisms of barium titanate based multilayer ceramic capacitors
… above one volt for X7R capacitors indicating space charge limited current. This dependance was attributed to point emission from electrode protuberances. The 3/2 dependance was observed to shift to a square law behavior with degradation. This change was attributed to a increase in conductivity …
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Cu₂S/ZnCdS thin film heterojunction solar cell studies
… the junction. Three methods–photocapacitance, space-charge-limited current, and thermally stimulated. current techniques–were used for deep trap measurements. Photocapacitance measurements indicate one deep donor energy and two deep acceptor energy levels. These trap energies become larger as …
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Electrical properties of silicon surfaces and interfaces
… in which carrier transport is controlled by space-charge-limited currents or tunneling through potential barriers on a percolating lattice.
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Immersed Finite Element Particle-In-Cell Modeling of Surface Charging in Rarefied Plasmas
… charging is a fundamental interaction process in space plasma engineering. A three-dimensional Immersed Finite Element Particle-In-Cell (IFE-PIC) method is developed to model surface charging involving complex boundary conditions. This method extends the previous IFE-PIC algorithm to explicitly …
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Electronic charge injection and transport in organic field-effect transistors
… a better understanding of the nature of charge transport in these devices and the physics of contacts is crucial to further development of optoelectronic organic devices. This work outlines our findings in understanding and characterizing the injection and transport mechanisms of charge …
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Emitting Wall Boundary Conditions in Continuum Kinetic Simulations: Unlocking the Effects of Energy-Dependent Material Emission on the Plasma Sheath
… coefficent and the sheath transitions into space-charge limited and inverse modes for different parameters. The breakdown of the classical sheath results in an increase of energy fluxes to the surface, with potential ramification for applications.
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