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 127 for “"open circuit voltage"”.
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Charge carrier recombination and open circuit voltage in organic solar cells
… of organic solar cells exists nowadays, their open circuit voltage is usually low compared to the band-gap of the active layer. Hence, organic low band-gap solar cells in particular show low open circuit voltages and the key factors that determine the voltage losses are not yet fully …
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Advanced Faraday cage measurements of charge, short-circuit current and open-circuit voltage
… of false instrument readings due to input offset voltage and other experimental effects. One wire mesh style of Faraday cage connected with an electrometer was also used to measure the charge. The liquid dielectrics are distilled water, tap water, Sargasso Sea water ...
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High open-circuit voltage in heterojunction photovoltaics containing a printed colloidal quantum-dot photosensitive layer
… have remained low, due in large part to low open-circuit voltages (VOC). Using printing methods, we deposit a layer of colloidal cadmium selenide (CdSe) quantum dots (QDs) onto a wide band-gap organic hole-transporting thin film of N,N'-bis(3-methylphenyl)-N,N'-bis-(phenyl)-9,9-spirobiuorene …
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Solar Driven Photoelectrochemical Water Splitting For Hydrogen Generation Using Multiple Bandgap Tandem Of Cigs2 Pv Cells And Thin Film Photocatalyst
… in the efficiencies is attributed to lower open circuit voltages with respect to the bandgap of the material. Presently, the main mechanism used to increase the open circuit voltage of these copper chalcopyrites (CuInSe2 and CuInS2) is the addition of gallium. However, addition of gallium …
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The Role of Quantum Dot Size on the Performance of Intermediate Band Solar Cells
… mechanisms for the reported decrease of the open circuit voltage and solar cell efficiency in quantum dot (QD) intermediate band solar cells (IBSCs). More specifically, the effect of indium arsenide (InAs) QD height on the open circuit voltage and solar cell efficiency was studied in a …
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Web-based computer simulation of lead-acid batteries
… behavior. Simulator inputs include nominal voltage, current draw, cycle time, and temperature. Outputs include charge voltage for float and cyclic applications, open circuit voltage as a function of depth of discharge, temperature compensated capacity, mass estimated, and an upper and lower …
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Capacitance spectroscopy on copper indium diselenide based solar cells
… responsible for the only sublinear increase in open circuit voltage with increasing band gap for devices with molar gallium to gallium plus indium ratio (GGI) larger than 0.3. A series of samples with different GGI is investigated using deep level transient and admittance spectroscopy (DLTS and …
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Electron-reflector strategy for CdTe thin-film solar cells
… maximum efficiency (29%), primarily because the open-circuit voltage (0.845 V) is well below what is expected for its band gap (1.5 eV). The incorporation of an electron reflector is a strategy to improve the open-circuit voltage of solar cells, and thus a strong possibility to improve the …
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Design and performance evaluation of lead-free inorganic perovskite solar cells for addressing Nigeria's energy crisis.
… an output current density of 35.01 mA/cm2, an open-circuit voltage of 0.77 V, and a Fill Factor (FF) of 0.7642. For crystalline silicon, varying the absorber layer thickness influenced the power conversion efficiency, which reached 25% at 300 K with an open-circuit voltage of 0.64 V and a …
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Photosynthesis-inspired device architectures for organic photovoltaics
… absorption and exciton diffusion and (2) low open-circuit voltage due to charge recombination at the donor-acceptor interface. In this work, we demonstrate two new device architectures inspired by photosynthesis that aim to overcome these two challenges. First, we overcome the trade-off …
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Characterisation of radiation effects in ultra-thin GaAs solar cells for space applications
… continuous wave and time-resolved, and current-voltage measurements. It is demonstrated that the preservation of short-circuit current up to high dose in ultra-thin solar cells can be attributed to the carrier lifetime remaining greater than the time taken for carriers to traverse the absorber …
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Charge recombination in organic small-molecule solar cells by Jiye Lee.
… result that may imply the spin-dependent open-circuit voltage in organic bilayer photovoltaic devices.
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Electrical characterization of organic devices: case study: polythiophene-fullerene based solar cells
… studied together with the dependence of current-voltage characteristics on temperature and illumination intensity. The increase of the short circuit current density with temperature is evidence of a thermally activated transport mechanism, characteristic to disordered materials. This result …
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Nuclear Magnetic Resonance Studies of Lithium Metal Anodes
… used to extract both an exchange current at the open circuit voltage and the SEI formation current as a function of time. In situ NMR methods are then developed to study ‘anode-free’ lithium metal batteries where the lithium is plated directly onto a bare copper current collector from a LiFePO4 …
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Nanocrystal Synthesis and Thin Film Formation for Earth Abundant Photovoltaics
… to exceed 12.6%, principally due to the low open-circuit voltage (VOC) achieved in these devices compared to the absorber band gap.
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Experimental investigation of novel proton exchange membrane fuel cell and battery integrated system
… curve, energy efficiency, exergy efficiency, and open circuit voltage. Furthermore, the performance evaluation of the fuel cell and battery integrated system is performed. The performance assessments of the system are performed through the energy and exergy efficiencies. Moreover, the effect of …
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Visible and Infrared Light Detection Using 2D Materials
… and transition metal dichalcogenides (TMDs) open up the potential for pushing electronic devices, from transistors to photovoltaics, to the atomic limit. In particular, many transition metal dichalcogenides such as tungsten diselenide (WSe₂) have properties such as a large absorption …
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Efforts Towards Micro Fuel Cells
… running on formic acid and oxygen, the highest open circuit voltage is 0.79 V and the current density is 13.3 mA/cm2. These initial results show that nanoporous silicon membranes are very promising materials for electrolyte applications especially in silicon-based micro fuel cells. The technique …
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Vibration Energy Harvesting IC Design with Incorporation of Two Maximum Power Point Tracking Methods
… adopted to extract power and regulate the output voltage for the load with one stage. The power stage is controlled with a new maximum power point tracking (MPPT) algorithm, which integrates both fraction open circuit voltage (FOCV) and perturb and observe (PandO). The proposed algorithm was able …
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Optimization of PEDOT: PSS thin film for organic solar cell application
… and metal. Power conversion efficiency, short circuit current, open circuit voltage and fill factor were measured on all produced devices. In contrast, the devices with 50 nm thickness of PEDOT: PSS layer showed as better solar cell with 0.0394% efficiency compared to the devices without …
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