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 91 for “"organic solar cells"”.
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Rational design of hybrid organic solar cells
… present a novel design for a nano-structured organic-inorganic hybrid photovoltaic 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 …
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Nanocomposites for Enhancing Current in Organic Solar Cells
The enhancement of charge collection in organic photovoltaics by using nanocomposite materials is investigated. Two such approaches are detailed in this thesis. Chapter 1 addresses the addition of metal nanorods to the PEDOT layer of an organic solar cell in an attempt to focus incident light for …
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Stability and degradation mechanisms in organic solar cells
… sowie mit Degradationsmechanismen in organischen Solarzellen. Für eine erfolgreiche Marktplatzierung, ist es neben der weiteren Verbesserung des Wirkungsgrades von großer Bedeutung, die Stabilität und Lebensdauer organischer Solarzellen zu erhöhen. Folglich beschäftigt sich diese Arbeit mit der …
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Nanocarbons as charge carriers in organic solar cells
Organic photovoltaics (OPV) are an alternate to conventional silicon and thin film solar cells. They have several advantages such as simple fabrication, low material cost, light weight, and the ability to cover large areas. Typical OPV are based on bulk heterojunction structure consisting of a …
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Vibrational spectroscopy of photosensitizer dyes for organic solar cells
… investigated as potential photosensitizers in organic solar cells. Of particular interest is their use in dye-sensitized solar cells based on nanocrystalline films of TiO2. Functional groups of the dye allow for efficient anchoring on the semiconductor surface and promote the electronic …
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Stability of zinc phthalocyanine and fullerene C60 organic solar cells
Organic solar cells promise electricity generation at very low cost, and higher installation flexibility as compared to inorganic solar cells. The lower cost is achieved by cheaper semiconductors and easier manufacturing processes. The flexibility is naturally given by these ultra-thin, amorphous …
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Fundamental investigations on periodic nano- and microstructured organic solar cells
Using organic semiconducting materials in solar cells is a new approach with <br>promising possibilities. The great potential of low cost production combined <br>with mechanical flexibility gives rise to new applications. Due to the relatively simple fabrication process from solution and the …
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Photophysical Studies of Active Layer Compositions in Organic Solar Cells
For the last few decades, inorganic solar cells, such as gallium arsenide and silicon, have dominated research and commercial ventures. Commercial silicon-based solar cells have particularly expanded in recent years, including significant rises in small-scale home solar installations and solar …
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Charge carrier recombination and open circuit voltage in organic solar cells
… progress in the development of thin film solar cell techniques has been made over the last decade. The field of organic solar cells is constantly developing, new material classes like Perowskite solar cells are emerging and different types of hybrid organic/inorganic material combinations …
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Correlation between dynamic parameters and device performance of organic solar cells
Organic bulk heterojunction (BHJ) solar cells based on polymer:fullerene blends are a promising alternative for a low-cost solar energy conversion. Despite significant improvements of the power conversion efficiency in recent years, the fundamental working principles of these devices are yet not …
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Understanding electronic defects in organic solar cells: Defect identification, characterization & mitigation
<p>Among several thin-film based solar technologies, organic or hybrid organic- inorganic photovoltaic (PV) technology is envisioned as a foremost candidate towards the realization of ubiquitous and economical solar power. Organic PV (OPV) technology has the advantages of facile fabrication …
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Organic solar cells based on liquid crystalline and polycrystalline thin films
This dissertation describes the study of organic thin-film solar cells in pursuit of affordable, renewable, and environmentally-friendly energy sources. Particular emphasis is given to the molecular ordering found in liquid crystalline or polycrystalline films as a way to leverage the efficiencies …
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Spectroscopic Studies of Charge Dynamics in Non-Fullerene Organic Solar Cells
Organic solar cells (OSCs) are a promising technology for emission-free electricity supply. However, low power conversion efficiencies and poor device stabilities have so far prevented widespread commercial applications. Remarkable progress has been made recently by the development of non-fullerene …
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Green Organic Solar Cells from a Water Soluble Polymer and Nancrystalline TiO2
The cost of the present generation of inorganic silicon solar cells is very high and further breakthroughs in cost and efficiency using traditional materials are becoming less and less likely after over 50 years of development. Next generation organic solar cells offer a solution to the limitations …
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Enhancing materials for fuel cells and organic solar cells through molecular design
… fuels, research in improving efficiencies of solar cells and fuel cells have grown rapidly over the last few decades. One prominent strategy to improving the efficiencies in these devices focuses on engineering materials with customized molecular structure for enhancements in specific …
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P3HT:PCBM-based organic solar cells : Optimisation of active layer nanostructure and interface properties.
Organic solar cells (OSCs) have attracted a significant attention during the last decade due to their simple processability on a flexible substrate as well as scope for large-scale production using role to role technique. Improving the performance of the organic solar cells and their lifetime …
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