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 56 for “"bulk heterojunction"”.
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Composition, structure, and performance of nanocrystal bulk heterojunction photovoltaics
We describe the fabrication and study of bulk heterojunction solar cells composed of PbS quantum dots and TiO2. In particular, we study the effects that bulk heterojunction composition and structure have on resulting device performance. We find that PbS and titania are extremely evenly distributed …
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Characteristics of a New Copolymer For Bulk Heterojunction Solar Cells
<p>Organic solar cells have attractive aspects like flexibility, light-weight, environment-friendliness and low-cost due to manufacturing-ease on large area substrates using roll-to-roll processing, solution casting or screen printing. Most high performance organic solar cells utilize tandem …
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Electrical and optical characterisation of bulk heterojunction polymer-fullerene solar cells
Manufacturing polymer-fullerene solar cells can be less expensive and less complicated as compared to inorganic solar cells. We studied transport properties of the polymer- poly3(hexyl-thiophene) (P3HT), fullerene - [6,6]-phenyl-C61 butyric acid methyl ester (PCBM), and P3HT:PCBM blends of selected …
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Loss analysis of the power conversion efficiency of organic bulk heterojunction solar cells
… and environmentally friendly way. Especially the bulk-heterojunction solar cells, consisting of blends of conjugated polymers or of conjugated polymers and small molecules, are promising for this purpose. In this thesis the power conversion efficiency and lifetime of bulk heterojunction solar …
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Influence of Solvent Additives on Stability, Performance and Morphology of Conjugated Polymer/Fullerene Based Organic Bulk Heterojunction Solar Cells
<p>Organic bulk heterojunction solar cells use polymer thin film technology which is cost effective, flexible and easily processable. P3HT:PCBM bulk heterojunction solar cell is most widely studied organic solar cell. Solvent additives have been shown to enhance power conversion efficiency, but its …
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Aspects of Photovoltaic Systems: Study and Simulation of Silicon Phthalocyanine Bulk Heterojunction Solar Cells and Monochromatic Photonic Power Converters
… for fast energetic and economic payback periods. Bulk heterojunction organic solar cells are a common design, as they have particularly low manufacturing costs due to a simple device architecture. In this work, two bulk heterojunction blends are experimentally assessed using the acceptor molecule …
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Carbon Nitride and Conjugated Polymer Composite Materials
… AFM data suggested that CNx may form a bulk heterojunction with PBT. Thermal annealing of nitrogen rich CNx films led to n-type semiconductor materials consisting of a graphitic carbon nitride network as determined using X-ray photoelectron spectroscopy, and these materials exhibited …
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Rational design of hybrid organic solar cells
… material that will address current challenges in bulk heterojunction (BHJ) organic-based solar cell materials. Utilizing first principles Density Functional Theory (DFT), we show that layered inorganic phosphates and tradition organic dyes can be combined to form a new class of bulk heterojunction …
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Molecular design for controlling morphology in organic electronics
… an emphasis on morphology control in polymer bulk-heterojunction devices. Chapter 2 describes the synthesis of a class of polymer additives for bulk-heterojunction (BHJ) solar cells based on an extended triptycene-containing unit. The incorporation of these additives on BHJ photovoltaic …
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Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells
… that singlet fission can be implemented in bulk heterojunction photovoltaics, which is an important result since some of the highest efficiency organic photovoltaics in the last 5 years have been bulk heterojunction structures. Secondly, we showed that the magnetic field effect can be used …
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Nanostructured architectures for colloidal quantum dot solar cells
This thesis introduces a novel ordered bulk heterojunction architecture for colloidal quantum dot (QD) solar cells. Quantum dots are solution-processed nanocrystals whose tunable bandgap energies make them a promising active-layer candidate for next-generation optoelectronic devices, including …
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Charge recombination in organic small-molecule solar cells by Jiye Lee.
… the charge recombination dynamics of thin film bulk heterojunction of the archetype organic solar cell molecules, copper phthalocyanine (CuPC) and 3,4,9,10-perylenetetracarboxylic bis-benzimidazole (PTCBI). We report the formation of triplet excitons on PTCBI molecules, which may be an important …
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Kolloidale Goldnanopartikel : Synthese, Charakterisierung und Wirkung in Polymer/Fulleren-Solarzellen
… eingebracht wurden, indem sie einerseits in den bulk-heterojunction-Aufbau der photoaktiven Schicht integriert wurden und andererseits als Zwischenschicht im Deviceaufbau vorlagen. Es konnte weder für Au-Nanopartikel, die mit einer isolierenden, organischen Ligandenhülle umgeben waren, noch für …
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Nanostructured photovoltaics : improving device efficiency and measuring carrier transport
… combines a zinc oxide (ZnO) nanowire ordered bulk heterojunction (OBHJ) architecture with band alignment engineering of the PbS QD film to enhance charge extraction is demonstrated. This approach results in PV devices with photocurrent density greater than 30 mA/cm2, which represents a 15% …
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Optimization of PEDOT: PSS thin film for organic solar cell application
… and material shortness. In this work, P3HT: PCBM bulk-heterojunction devices were produced by spin coating organic layers onto ITO coated glass in air, and deposited it with an Au layer as top metal electrode. Inverted devices were fabricated with and without PEDOT:PSS. Then, several attempts have …
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Singlet Fission Organic Solar Cell with Long-Wavelength Absorption Using Non-fullerene Acceptors
… coupling a thin layer of tetracene to a PM6:Y6 bulk heterojunction solar cell, which is well-known OPV structure. We found that the addition of tetracene boosts external quantum efficiency at its peak absorption wavelengths and the overall power conversion efficiency. Further improvements to the …
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Investigation of dye-sensitized solar cell performance with single chirality semiconducting carbon nanotubes
… separated by this technique has been applied in bulk heterojunction solar cells and other basic electronics, no one has attempted to use this material in DSSCs. Single-chirality carbon nanotubes allow adjustment of the Schottky barrier height at the TiO2/CNT/FTO interface and the presence of …
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Barium Oxide as an Intermediate Layer for Polymer Tandem Solar Cell
… with each solution processed layer using Bulk Heterojunction (BHJ) materials comprising semiconducting polymers and fullerene derivatives. For years, tremendous efforts have been put in seeking for an efficient intermediate layer to successfully connect two sub-cells together in the tandem …
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Molecular Engineering of Self-Assembled and Mechanically Robust Polymer Solar Cells
… additives, and polymer composites used in the bulk-heterojunction organic photovoltaics solar cells. Through chemical manipulations and device processing optimizations we are able (i) to study the interface between different phases of polymer-polymer blends and its impact on their …
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Hydrothermal synthesis of Al-doped ZnO nanowires and their application for photovoltaic devices
… a scheme for the development of ordered bulk heterojunction photovoltaic devices incorporating solution-based n-type doped ZnO nanowires and PbS quantum dots. In order to improve the electrical properties of ZnO nanowires, Al doping of hydrothermally synthesized ZnO nanowires is studied …
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