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Showing 1 to 10 of 10 for “"multiple exciton generation"”.
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NANOSCALE ENERGY TRANSPORT IN PHOTOVOLTAIC AND THERMOELECTRIC NANOMATERIALS
… wavelength range. Their small size also makes multiple exciton generation possible in certain situations. However, their device performance is usually limited by the poor charge transport. Tellurium-based nanoparticle studies were performed in the form of photovoltaic film research, and later, …
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Anisotropic Heterostructures of Nanocrystals
… of materials with type II band offset and multiple exciton generation, TiO2/CdS and TiO2/PbS NC heterostructures have been synthesized as potential photocatalysts. While there is a need for improvement in yield and controlling of geometries by modifying synthetic method, new paradigm in …
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Photoluminescence Characterization of Patterned Quantum dots and Inverse Quantum dots
… increase the efficiency of solar cells through multiple exciton generation. In this thesis, the fabrication and characterization of defect-free quantum dots and anti-dots are discussed.
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Langmuir Blodgett films of colloidal silicon quantum dots for hot carrier photovoltaics
… practical low-cost and high-efficiency third generation solar cells. The solution processability of colloidal QDs enables low-cost fabrication of various kinds of colloidal QDs solar cells. Moreover, favourable carrier dynamics are revealed in colloidal QDs, such as multiple exciton generation …
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Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells
… In this work we explore implementations of a multiple exciton generation process, singlet exciton fission, to work around the Shockley-Queisser limit, according to which, all single junctions cells have a theoretical efficiency limit of 33.7%. This is the first implementation of a singlet …
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Theoretical characterisation of spheroidal PbSe/PbS Core/Shell colloidal quantum dot heterostructures
… efficiency of 42% through the exploitation of multiple exciton generation (MEG). In this process, several electron-hole pairs are created by the absorption of a single high energy photon, as opposed to the single excitons created in conventional solar cell devices. IV-VI semiconductor …
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Electronic Structure Modelling of Singlet Fission in Organic Photovoltaics
Singlet fission is a multiple-exciton-generation process found in organic materials that could help to enhance the efficiency of future photovoltaic devices, by overcoming the Shockley-Queisser limit. In spite of considerable experimental and theoretical attention, different aspects of the process …
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Generalized detailed balance theory of solar cells
… model has to include the continuity equation for excitons, which are relevant in organic materials due to the higher exciton binding energy. The special geometry of organic solar cells, which usually consist of a bulk heterojunction, is also considered. The model for organic polymer-fullerene …
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Understanding electronic and optical properties of PbS QDs for improved photovoltaic performance
… sizes or shapes, wide spectral responses, and multiple exciton generation. To date, the efficiency advances of QD solar cells have been carried out almost exclusively through tremendous numbers of trial and error experiments. Examples include materials set variations, donor and acceptor layer …
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Overcoming Efficiency Limits in Photovoltaic Devices
… In organic materials, an excited singlet exciton splits to form two triplet excitons on neighbouring molecules. The process in organics is referred to as singlet fission. Producing a device that can make use of the singlet fission process however, has proved difficult, limited in part by …