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.
Results
Showing 1 to 20 of 79 for “"organic semiconductor"”.
-
Organic semiconductor lasers with two-dimensional distributed feedback
… lasers based on thin films of a disordered organic semiconductors (OS). The high luminescence yield of OS together with their conductivity and the ease of processing them into sub-micron thick films on substrates of virtually any shape and size open vast opportunities both for the …
-
The synthesis of liquid crystalline materials for organic semiconductor device applications
… the potential fabrication of multi-layer, organic semiconductor devices due to the insoluble, cross-linked polymer network obtained after polymerisation of the analogous reactive mesogens (RMs).
-
Physics and simulation of transport processes in hybrid organic semiconductor devices
Organic semiconductors and nanomaterials promise to potentially form the basis for future efficient and cost-effective large area optoelectronic devices, such as lightemitting diodes and solar cells. Although these materials' amorphous nature allow utilization of cheap, high-throughput …
-
Fluid characterisation and drop impact in inkjet printing for organic semiconductor devices
An inkjet printer can deposit a very small volume of liquid with high positional accuracy, high speed and low cost. As a maskless, non-contact additive patterning method, inkjet printing technology is increasingly being explored as an alternative to lithography, etching and vapour deposition …
-
DNA Directed Organic Semiconductor Interactions Controlling Excitons, Charge Transfer States, and Singlet Fission
Excited states in organic semiconductors are generated, transported, and converted through π-orbital interactions between multiple molecules. Hence, efficiency depends on the relative geometries between molecules. Yet, control over spatial assembly of organic semiconductors is challenging. Large …
-
Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells
Organic semiconductor photovoltaics hold the promise of cheap production and low manufacturing setup costs. The highest efficiency seen in research labs, ~10% today, is still too low for production. In this work we explore implementations of a multiple exciton generation process, singlet exciton …
-
Improved Organic Semiconductor Thin-Film Formation through the Addition of Vibrations to the Solution Shearing Method
… conditions for the solution shearing of organic semiconductors for organic field-effect transistors (OFETs) are investigated. Electrical performance for OFETs is currently still limited by the charge carrier mobility, especially when high fabrication speeds are required. In this work, …
-
IN SITU SPECTROSCOPY INVESTIGATION OF ALKALI METAL INTERACTION MECHANISM WITH ORGANIC SEMICONDUCTOR FOR STABILIZING ALKALI METAL ANODES
… investigations through surface techniques, using organic semiconductor model systems with unique functional groups, which can provide direct evidence without the influence of complex battery systems.
-
Charge-carrier transport in amorphous organic semiconductors
… of efficient luminescence and absorption in organic semiconductors, organic light-emitting devices (OLEDs) and photovoltaics (OPVs) have attracted increasing interest. Organic semiconductors have proven to be a promising material set for novel optical and/or electrical devices. Not only do …
-
Flexible and solution-processed organic thin film transistors for high voltage applications
… and pentacene high-voltage organic thin film transistors (HVOTFTs) were fabricated on solid and flexible substrates via a low temperature (< 120 °C) solution-processed and vacuum-deposited fabrication methods, achieving breakdown voltages and on/off current ratios beyond -550 …
-
A novel sublimable mask lift-off method for patterning thin films
… sub-micron-scale definition of single-crystal semiconductor devices for over half a century. Unfortunately, organic semiconductor devices are chemically incompatible with the types of resists, solvents, and etchants traditionally used. This work investigates the use of a chemically inert resist …
-
Correlation between interface-dependent properties and electrical performances in OFETs
… in determining the electrical performances in organic devices is that, even though they are usually thought as macroscopic devices, their behaviour is strongly driven by interfacial phenomena taking place in the nano scale. The focus of this thesis is the realization and characterization of …
-
Spin injection and manipulation in organic semiconductors
The use of organic semiconductors to enable organic spintronic devices requires the understanding of transport and control of the spin state of the carriers. This thesis deals with the above issue, focusing on the interface between the organic semiconductor and the spin source. The morphology of …
-
High efficiency top-emitting organic light-emitting diodes: design and fabrication
… as follows: In Chapter 2, the basic physics of organic semiconductor materials are reviewed, including the electronic properties of organic semiconductor materials, molecular excitations and their electronic transitions etc., which are believed to be critical for understanding of the work. Then, …
-
The bias-stress effect in pentacene organic thin-film transistors
Organic thin-film transistors (OTFTs) are promising for flexible large-area electronics. However, the bias-stress effect (BSE) in OTFTs causes operational instability that limits the usefulness of the OTFT technology in a wide range of circuit applications. Currently, most existing studies on OTFT …
-
CHARGE TRANSPORT IN ORGANIC AND HYBRID PEROVSKITE FIELD EFFECT TRANSISTORS
Organic semiconductors and hybrid organic/inorganic perovskite semiconductors can address new applications, which are off-limits for conventional silicon-based electronics. We fabricate organic field-effect transistors (OFETs) and through the use of several device architectures, in combination with …
-
Perylene Diimide Molecular Glass: Investigations of Charge Transport
A new glass-forming organic semiconductor material was synthesized using a known electron transport material, perylene diimide, and attaching it to a molecular glass in order to allow the material to be solution processed. Devices were made using a simple metal-semiconductor-metal structure and …
-
Hydrogenation of nanostructured carbon, synthesis of organic semiconductors and progress towards synthesis of fullerenes and nanoribbons from polyaromatic hydrocarbons
… was also synthesized, a stable organic semiconductor that exhibits poor solubility. A new type of organic semiconductor, trithiapentacenone (TTPO), was also synthesized. TTPO exhibits superior thermal and photooxidative stability, and is in fact stable in air at 400 °C. The …
-
Nanoparticle-based Organic Energy Storage with Harvesting Systems
A new form of organic energy storage devices (organic capacitors) is presented in the first part of this dissertation. The storage devices are made out of an organic semiconductor material and charge storage elements from synthesized nanoparticles. The semiconducting polymer is obtained by blending …
-
Light scattering studies of organic field effect transistors
Organic semiconductors hold a great promise of enabling new technology based on low cost and flexible electronic devices. While much work has been done in the field of organic semiconductors, the field is still quite immature when compared to that of traditional inorganic based devices. More work …
Page 1 of 4