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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 28 for “"Short Circuit Current Density"”.
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Nanocarbons as charge carriers in organic solar cells
… OPVs to improve PCE. It has been found that the shorted MWNTs provide larger surface area for exciton dissociation and better phase separation and probably lead to less charge recombination. Therefore, they show higher PCE. Functionalized nanodiamonds (ND) are also introduced to C60 to synthesize …
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Optical Modeling of Solar Cells
… cell. The Q.E. allows the calculation of the short circuit current generated by the solar cell and the R and T allow for the calculation of the reflection loss of the solar cell. The analytical tool used in this thesis is based on such an approach and is used to evaluate the compatibility of …
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Design and fabrication of nitride-based solar cells and integration for tandem cell
… a backside reflector yields an increase in the short circuit current density of up to 20%. This demonstration of transferred InGaN-based solar cells on foreign substrates while increasing performance represents a major advance toward lightweight, low cost and high efficiency photovoltaic …
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Integrated Tandem Dye Sensitized Solar Cell (DSSC)-Lithium Ion Battery
… storage device was developed that addresses short term photovoltaic (PV) power variability using dye sensitized solar cell (DSSC) in a tandem structure with thin film based lithium-ion battery. As lithium based batteries have been addressed as efficient charge storage system due to its high …
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Design and performance evaluation of lead-free inorganic perovskite solar cells for addressing Nigeria's energy crisis.
… conversion efficiency of 21.1%, with 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 …
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Development of low-temperature solution-processed colloidal quantum dot-based solar cells
… Through a combination of thickness-dependent current density-voltage characteristics, optical modeling, and capacitance measurements, the combined diffusion length and depletion width in the PbS QD layer is found to be approximately 170 nm. In the organic/inorganic hybrid device, …
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Performance limits for colloidal quantum dot and emerging thin-film solar cells
… absorption from charge extraction, improving the short-circuit current density by 50% and the power conversion eciency by 35%. Finally, we attempt to answer the question "Are QD solar cells worth pursuing further?" We use photothermal deflection spectroscopy to characterize disorder-induced band …
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Research and development of CdS/CdTe solar cells incorporating ZnTe layers.
… fabricated had glass/FTO/CdS/CdTe/Au structure. Current-voltage (I-V) measurement was employed to assess the performance of solar cell devices by measuring the open circuit voltage (V[oc]), short circuit current density (J[sc]), fill factor (FF) and conversion efficiency (eta). The highest …
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Band anti-crossing modelling and characterization of multi quantum well gainnas for photovoltaic application
… mesa active area on diodes were conducted using current-voltage measurements under dark and illumination. An increasing mesa active area was found increment in the dark current and ideality factor, while the value of short-circuit current density and efficiency parameters (photovoltaic) were …
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Electrical characterization of organic devices: case study: polythiophene-fullerene based solar cells
… were 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 …
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Fabrication and Optimization of Single-Junction GaAs Thin Film Solar Cells on Epi-ready Flexible Metal Tapes for Low-cost Photovoltaics
… coating. Efficiency greater than 6% with open circuit voltage (VOC) of 566mV, fill factor (FF) of 68%, short circuit current density (JSC) of 17.4mA/cm2 was obtained. Steps were taken to improve the quality of p-n junction by improving the quality of Ge template and incorporating an intrinsic …
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Characterization of Proton and Sulfur Implanted GaSb Photovoltaics and Materials
… The damage induced by protons enhanced the hole density of GaSb up to around 10 times, whereas mobilities showed both increase and decrease compared to the un-implanted one, depending on the dose. While the activation of sulfur donors at an elevated temperature was anticipated after annealing …
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Visible and Infrared Light Detection Using 2D Materials
… were shown to exhibit large improvements in the short circuit current and open circuit voltage due to antireflection coating effects, surface doping, and surface trap passivation. A single absorber solar cell with an open circuit voltage (Voc) of 380 mV and short circuit current density (Jsc) of …
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Sulfur Implanted GaSb for Non-Epitaxial Photovoltaic Devices
… caused by the implant, which induces a large density of acceptor-like defect states near the valence band edge. This technique was used on an unintentionally-doped p-type GaSb substrate to create a + /p junction. The implant process succeeded in producing a potential barrier similar to that of …
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Lewis-base Thioacetamide assisted crystallization of lead-free perovskite solar Cells for improved Efficiency
… pinholes, poor crystallinity, and a high defect density in the films. The addition of Lewis bases to the Sn-perovskite precursor solution was proposed as a way to slow down the crystallization process by weakening the interactions between the precursors. In this thesis, to get high-quality …
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Establishing nanoscopic structure-function relationships in the working electrodes of dye-sensitized solar cells
… DSSCs. The co-sensitized DSSCs can gain higher short-circuit current density and power conversion efficiency with specific molar ratios of the co-sensitizing solution, although open-circuit voltage remains lower than that of the cell based on pure RK-1 dye sensitizers. The analysis also suggests …
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Characterization of type-II GaSb quantum rings in GaAs solar cells
… spectrum and subsequently an increased photocurrent through the solar cell. Type II GaSb/GaAs quantum rings (QRs) can significantly extend the spectral response beyond the visible out towards 1.4 µm giving a near optimum band gap for concentrator solar cell applications. Also, in type II band …
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Modeling, design and fabrication of thin-film microcrystalline silicon solar cells
… of the cell. In order to obtain acceptable short circuit current density (Jsc) from the cell, it is found that the thickness of the silicon thin film should be more than 10um. To get the best light trapping effect, the surface of the cell should be double-side or frontside textured. The …
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Development and characterization of solar energy conversion devices based on nanocomposite semiconductors
… at 300oC and 500oC, demonstrated improved short−circuit current density promoting their overall efficiency up to 26−30% compared with solar cells with untreated electrodes. Among the titanium precursor materials used to fabricate transparent TiO2 films for DSSC, the solar cells with the …
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Nanoimprint lithography for light trapping applications in solar cells
… (Si) thin-film solar cells is studied. The short-circuit current enhancement for cells with a back reflector is 34% and 30% with a multi-disperse array and the mono{u00AD}dispersed array respectively, compared to 13% enhancement due to the reflector alone. The better performance of …
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