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 30 for “"charge generation"”.
-
Electrostatic charge generation in hydrocarbon liquids
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1979.
-
Spectroscopic Studies of Charge Dynamics in Non-Fullerene Organic Solar Cells
… achieved. Furthermore, they have shown efficient charge separation with negligible energy loss, overcoming one of the crucial limitations of fullerene based OSC. Here, we present a study on the charge generation, separation, and recombination dynamics of non-fullerene solar cells. We investigate …
-
Generation, recombination and extraction of charges in polymer
… organic materials systems, the yield of charge generation can be very efficient. However, a detailed understanding of the free charge carrier generation mechanisms at the donor acceptor interface and the energy loss associated with it needs to be established. Moreover, organic solar cells …
-
DESIGN, SYNTHESIS, AND CHARACTERIZATION OF NANOCOMPOSITES TO IMPROVE THE PERFORMANCE OF PHOTOVOLTAIC CELLS
… optimized to improve the optical absorption and charge transport properties. The PV cells fabricated with these materials exhibited improved power conversion efficiencies (PCE). The origin of charge generation and charge transfer was studied using different photoactive materials such as CdSe …
-
Field Induced Polymer Electroluminescence
… conductor, polymer dielectric layers, charge generation layers, a conjugated polymer-based emissive layer, and reflecting electrode. Emphasis is placed on a solution-processed fabrication approach, favoring organic polymers and small molecules. The phenomena of phosphorescence is …
-
Removing the Spin-Triplet Loss Pathway in Organic Solar Cells: A Strategy to Enhance Radiative Efficiency and Minimise Energy Loss
… created as a result of unavoidable non-geminate charge recombination processes. Triplet excitons represent a major non-radiative loss pathway in organic solar cells and through this work, we demonstrate tactics to reduce the non-radiative decay of photo-generated charges and thereby enhance the …
-
High open-circuit voltage in heterojunction photovoltaics containing a printed colloidal quantum-dot photosensitive layer
… heterojunction photovoltaics. Absorption and charge generation occur primarily in the QD layer and indium tin oxide (ITO) provides the top contact, allowing for exceptional device stability and full transparency below the QD bandgap of 2.0 eV. Overall power conversion efficiencies remain low …
-
Charge transfer engineering in Phenyl-modified Carbon Nitride-based hybrid systems: from powder Photocatalysts to Thin films
… however, its performance is limited by rapid charge carrier recombination, low mobility, and inefficient charge utilization. To overcome these intrinsic drawbacks, this thesis adopts charge transfer engineering as a central design strategy, focusing on controlling charge generation, …
-
Organic photovoltaics and concentrators
The separation of light harvesting and charge generation offers several advantages in the design of organic photovoltaics and organic solar concentrators for the ultimate end goal of achieving a lower cost solar electric conversion. In this work, we explore two new device architectures. In antenna …
-
A model for the initiation and propagation of electrical streamers in transformer oil and transformer oil based nanofluids
… of this thesis a comprehensive analysis of the charge generation mechanisms that could play a role in streamer development is presented.
-
Nano and Nanostructured Materials for Optical Applications
… The faster build-up time is attributed to better charge generation and mobility due to the presence of graphenes in the composite. Lastly, a facile nanofabrication technique is developed to produce metallic nanostructures with a tunable plasmonic response. The enhancement of the light-matter …
-
Development of detectors for the monitoring of mixed radiation fields
… by evaluating neutron capture probability, charge generation, transport, and collection efficiency. The integration of detailed particle interaction modeling with advanced charge transport simulations enables an efficient exploration of detector geometries and accurate estimation of …
-
Photophysics of cadmium selenide quantum dot solids
… structure, the optical absorption ~ross-section, charge separation, and transport in cadmium selenide colloidal quantum dots. The electronic states and optical absorption cross-section are found to be less sensitive to changes in the dielectric environment than predicted from theory unless …
-
The development of MRI-compatible SPECT system
… it is crucial to develop a precise model of the charge- collection behavior for CdTe detectors operated in strong magnetic field for reconstruction. In this study, a comprehensive Monte Carlo model has been developed for predicting the response function of the small-pixel CdTe detectors operated …
-
Probing charge motion in next-generation semiconductors with scanned probe microscopy
… researchers to explore spatial variations in charge generation and transport in solar-cell films prepared on a conductive substrate with a best-case resolution of 2 nanometers. In this thesis, we introduce new scanned probe measurements to measure light- and voltage-induced changes to …
-
Soft matter engineering for cellular bioelectronic interfaces
… nature, interactions between living systems and charged entities occur across multiple scales (cells, tissues, organ systems). These interfaces between electrical and living systems, known as bioelectronics, can be leveraged to monitor and modulate biological functions. In partic- ular, …
-
Correlation between dynamic parameters and device performance of organic solar cells
… of organic solar cells is determined by the generation of free charge carriers upon light absorption and their transport to the electrodes in competition to the loss of charge carriers due to recombination. The object of this thesis is to provide a comprehensive understanding of the dynamic …
-
Investigation on Transport Mechanisms and Interfacial Properties of Solar Cells By Simulation
Understanding the charge transport mechanisms and the surface interfacial properties of polymer-based solar cells is the prerequisite to crack the working mechanisms and improve the performances of photovoltaic devices. In order to increase the power conversion efficiency of dye sensitized solar …
-
Topology optimization and physical realization of magnetically active soft materials: from reprogrammable metamaterials to biomedical robots
… magnetic soft materials with electrets (immobile charges) inducing coupled electric field. These magnetoelectric materials generate electric output through magnetically induced deformation and deformation-induced charge redistribution. We successfully optimize these structures for both charge …
-
Ultrafast Spectroscopic Studies of Solution-Processing Organic Photovoltaic Materials and Devices
… efficiency from molecular excited states into charge carriers. Chapter 2 presents a historical review of different material combination, device architecture and key processes relevant for solar cell performance. This leads to the key questions that this thesis addresses: which molecular …
Page 1 of 2