Sökning: "NEXAFS"
Visar resultat 11 - 15 av 38 avhandlingar innehållade ordet NEXAFS.
11. Characterization of Self-Assembled Monolayers of Oligo(phenyleneethynylene) Derivatives on Gold
Sammanfattning : Oligo(phenyleneethynylene) (OPE) molecules are a class of fully conjugated aromatic molecules, that attract attention for their application as “molecular wires” in molecular electronic devices. In this thesis work, self-assembled monolayers (SAMs) formed from a variety of OPE derivatives have been studied. LÄS MER
12. The morphology of polyfluorene : fullerene blend films for photovoltaic applications
Sammanfattning : Polymer photovoltaic systems whose photoactive layer is a blend of a semiconducting polymer with a fullerene derivative in a bulk heterojunction configuration are amongst the most successful organic photovoltaic devices nowadays. The three-dimensional organization in these layers (the morphology) plays a crucial role in the performance of the devices. LÄS MER
13. Theoretical studies on electronic structure and x-ray spectroscopies of 2D materials
Sammanfattning : Extraordinary chemical and physical properties have been discovered from the studies of two-dimensional (2D) materials, ever since the successful exfoliation of graphene, the first 2D material. Theoretical investigations of electronic structure and spectroscopies of these materials play a fundamental role in deep understanding the various properties. LÄS MER
14. Morphology and material stability in polymer solar cells
Sammanfattning : Polymer solar cells are promising in that they are inexpensive to produce, and due to their mechanical flexibility have the potential for use in applications not possible for more traditional types of solar cells. The performance of polymer solar cells depends strongly on the distribution of electron donor and acceptor material in the active layer. LÄS MER
15. First Principles Studies of Carbon Based Molecular Materials
Sammanfattning : The aim of this thesis was to investigate carbon based molecular materials at first principles levels. Special attention has been paid to simulations of X-ray spectroscopies, including near edge X-ray absorption fine structure (NEXAFS), X-ray photoelectron, and X-ray emission spectroscopy, which can provide detailed information about core, occupied and unoccupied molecular orbitals of the systems under investigation. LÄS MER