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 13 of 13 for “"Energy level alignment"”.
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Energy Level Alignment in Hybrid Bulk Heterojunctions and New Redox Mediators for Quantum Dot Solar Cells
… with lowest unoccupied molecular orbital levels higher in energy than the conduction band of TiO2 for thermodynamically favorable electron transfer. Currently, the energy level values used to guide solar cell design are referenced from the separated materials, neglecting the fact that upon …
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Interfacial Electronic Structure of Dipolar Vanadyl Naphthalocyanine Thin Films
… is shown in this work that molecular electronic levels in both the ground and excited state manifolds can shift independently of the vacuum level. Further, electron transfer between close lying electron donor and acceptor energy levels may be influenced by energy level shifts caused by …
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Single Molecule Junction Conductance and Binding Geometry
… Tunneling Microscope (STM) we image, probe energy-level alignment and perform STM-based break junction (BJ) measurements on molecules bound to a gold surface. Using Scanning Tunneling Microscope-based break-junction (STM-BJ) techniques, we explore the effect of binding geometry on …
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Comparative study of zinc bis-quinolates and lithium mono-quinolates: Investigation of the effect of coordination geometry on electroluminescence performance
… as the emitter layer or host material the energy level-alignment affecting charge injection efficiency and charge mobility properties are of equal importance. Substitution of the 8-quinolinolato ligand or substitution of different metal ions has been shown to shift absorption and emission …
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Functional heterointerfaces via electromodulation spectroscopy
… This thesis is primarily concerned with the energy level alignment and the interfacial electronic structures at functional heterojunctions encountered in electronic devices made with solution-processable semiconducting polymers. Investigations on the electronic structures across these …
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Charge Transfer at Metal Oxide/Organic Interfaces
… spectroscopy was used to determine the energy level alignment of model systems. Additional computational studies allowed the examination of the properties of the charged organic molecules involved in charge transfer and modeling of the molecule-surface interaction. Calculations of the …
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Correlated electron transport across atomic and molecular tunnel junctions
… sensitivity to boundary conditions, and the level of treatment of electron correlation are tested. Comparisons with single particle methods yield agreement for systems with a lower degree of electron correlation such as alkane-based molecular junctions, with a larger disagreement between …
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Advancing inorganic perovskite solar cells for application in tandem architectures
… to the rapid transition towards renewable energy sources. While inorganic perovskite solar cells show superior temperature stability as compared to organic-inorganic perovskite solar cells, they have lower PCEs and lower open-circuit voltages (VOC), i.e. a higher voltage loss. In addition, …
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Electronic Structure Based Investigations of Hybrid Perovskites and Their Nanostructures
… electronic properties, related to alloying, energy level alignment in quantum wells, impact of chiral organic constituents on the atomic structure of 2D perovskites and resulting spin character of the electronic levels, and on the structure of related perovskite nanostructures.First, to …
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Behaviour of Perovskite Solar Cells Under Reverse Bias and Interface Engineering for Efficient and Stable Solar Cells
… deeper conduction bands, leading to preferable energy level alignment between SnO2 and perovskite. Consequently, the open-circuit voltage and fill factor of the devices increased, and target cells presented better stability, retaining 98% of initial efficiencies after more than 10000 h storage …
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Behaviour of Perovskite Solar Cells Under Reverse Bias and Interface Engineering for Efficient and Stable Solar Cells
… deeper conduction bands, leading to preferable energy level alignment between SnO2 and perovskite. Consequently, the open-circuit voltage and fill factor of the devices increased, and target cells presented better stability, retaining 98% of initial efficiencies after more than 10000 h storage …
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Μελέτη διεπιφανειών οργανικών ημιαγωγών με ανόργανα υποστρώματα με εφαρμογή σε οργανικά ηλεκτρονικά
Το ερευνητικό ενδιαφέρον για τους οργανικούς ημιαγωγούς είναι συνεχώς αυξανόμενο τα τελευταία χρόνια, καθώς η αγορά των οργανικών ηλεκτρονικών είναι από τις πιο αναπτυσσόμενες. Για την καλή απόδοση των διατάξεων αυτών σημαντικός είναι ο ρόλος των διεπιφανειών. Οι οικογένειες των n-type οργανικών …
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Development and characterization of solar energy conversion devices based on nanocomposite semiconductors
… of the development and characterization of solar energy conversion devices based on nanocomposite semiconductors. The PhD research is focused on third generation solar cells, namely in dye−sensitized solar cells (DSSCs) and perovskite solar cells (PSCs). The innovation of this study is detected on …