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 23 for “"Device Stability"”.
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Synthesis, Characterization and Device Studies of Conjugated Foldamers
… organic solar cells has improved to above 10%, device stability has remained a major issue. Conjugated foldamers can be considered as a viable option to achieve the desired stability. Conjugated foldamers are generally driven by secondary interactions such as π-π stacking, H-bonding, and …
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Improved dynamic stability using FACTS devices with phasor measurement feedback
… of power electronic controllers and compensation devices known as F1exible AC Transmission Systems (FACTS) technology. This thesis will examine the ability of FACTS technology to improve dynamic stability when controlled with data obtained from another recent advancement, phasor measurement units …
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Ab initio Study of Atomic Dynamics and Thermal Properties of Inorganic Clathrates, Chalcogenides and Perovskite Oxides
… semiconductors are important materials for devices used every day. One property that is crucial to device performance is thermal behaviour. This can be directly related to the efficiency of devices; for example, in thermoelectric power generators, a lower thermal conductivity gives a larger …
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Toward efficient and stable quantum dot solar cells : design and characterization
… cells still show unsatisfactory efficiency and stability. In this thesis work, room-temperature solution-processed ZnO/PbS solar cells with high efficiencies and unprecedented air-stability have been successfully demonstrated. The major limiting factors in present QD solar cells and potential …
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High open-circuit voltage in heterojunction photovoltaics containing a printed colloidal quantum-dot photosensitive layer
… form a unique planar heterojunction photovoltaic device. This structure is found to produce much higher VOC than previously predicted for donor/acceptor heterojunction photovoltaics. Absorption and charge generation occur primarily in the QD layer and indium tin oxide (ITO) provides the top …
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Evaluation Of The Photo-induced Structural Mechanisms In Chalcogenide
… and in geometries representative of actual devices. This study evaluates compositional dependencies and photo-induced structural mechanisms in As-S-Se chalcogenide glasses. An effective fabrication method for the reproducible processing of bulk chalcogenide materials has been demonstrated …
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Finite Element Modelling and Experimental Characterisation of Auricle Mechanics for Earable Design
Wearable devices are rapidly evolving into the next generation of smart technologies with the potential to transform daily life. Among these, auricle-mounted “earables” are emerging as a promising platform for neural interfaces, leveraging the ear’s anatomical accessibility, social acceptability, …
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Design and in vitro development of resorbable urologic drug delivery device
Implantable, controlled release drug delivery devices offer several advantages over systemic oral administration routes and immediate drug release treatments including direct therapy to target organ, more continuous maintenance of plasma and tissue drug levels and the potential for reduced side …
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Vacuum Transistors Based on III-Nitrides Field Emitter Arrays with Self-Aligned Gate
… future high-frequency and harsh-environment devices thanks to their scattering-free and radiation-robust vacuum channels. Field-emission vacuum transistors based on silicon and metals have been demonstrated over past 30 years, however the power consumption and long-term device stability are …
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Microstructured Halide Perovskites for Energy Applications
… them especially promising for application in devices. Perovskites can adopt different structural forms, including the polycrystalline one, where the high density of charge traps due to grain boundaries presents a major challenge. These traps not only compromise the device’s efficiency but also …
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Enhancing Stability in Quantum-Dot and Perovskite Optoelectronic Devices through Compositional Engineering and Surface Treatment
… progress is hampered today by limited operating stability. In this thesis, I study how compositional engineering and surface treatment can address these stability challenges to increase durability at high efficiency. My investigation begins with stable, environment-friendly blue emitters for …
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Liquid crystalline semiconductors for organic electronics
… transition temperatures, which is important for device stability as these materials are not reactive mesogens. A White-Light OLED has been demonstrated by the mixing of two LCs. This nematic binary mixture when used as the emissive layer in an OLED emits white-light that is voltage independent …
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Thick Conducting Polymer Coatings for Safe Electric Field Delivery to the Spinal Cord
… low interfacial impedance, and electrochemical stability under continuous stimulation. In vitro studies confirm neuronal viability under stimulation. Ex vivo studies demonstrate device stability and anatomical conformance. In vivo implantation in rodent models demonstrates mechanical stability …
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Efficient Organic Light-emitting Diodes with Singlet, Triplet and Doublet Excitons
… great electroluminescent behaviour and improved device stability. We then explore the triplet and singlet exciton harvesting for energy transfer to doublets. In the first CMA−CF3:TTM-3PCz system, ultrafast intersystem crossing process in CMA− CF3 leads to the generation of triplet excitons in …
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Characterization of a Viscoelastic Response from Thin Metal Films Deposited on Silicon for Microsystem Applications
… actuation are used in many applications where device stability and reliability are critical. The material response to the stress developed within the hinge during actuation controls how the actuator will respond to the actuating force. A fully recoverable non-linear viscoelastic response has …
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Stabilising Semiconducting Polymers Using Solid State Molecular Additives
… extrinsic environmental species that cause device instabilities as they are difficult to remove during low temperature processing and are able to penetrate into organic electronics after fabrication. This dissertation is centered on the search for and development of solid state molecular …
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Photophysical Properties of Emerging 2D Materials
… (2D) materials into nanostructure-based devices has played a vital role in enhancing physical and chemical properties, particularly for optoelectronic applications. Since their introduction, 2D ultra-thin materials, with their efficient performance and low cost, have attracted …
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Influence of Structural Disorder on Charge Transport and Stability in Organic Field-Effect Transistors with Molecular Semiconductors
… properties, as well as the optimization of device components to eliminate extrinsic factors that limit transport. Despite these achievements, the full potential of OSCs is often constrained by an incomplete comprehension of structure-property relationships and challenges posed by device …
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Role of polythiophene- based interlayers from electrochemical processes on organic light-emitting diodes
… as enhanced luminous efficiency compared to the devices without PbT. Investigations have also been made on the influence of PbT thickness on the efficiency and I-V feature as well as device stability of the OLED. It is demonstrated that the use of an electropolymerization step into the production …
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Stability study in lead-halide perovskite light-emitting diodes
… emitting diode (LED) technologies. However, poor device stability continues to be the limiting factor for perovskite LEDs (PeLEDs) to be realised towards commercialisa- tion. In this thesis, the stability study was first demonstrated on methylammonium lead bromide (MAPbBr3) PeLED device under …
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