Sökning: "Ray cells"

Visar resultat 6 - 10 av 259 avhandlingar innehållade orden Ray cells.

1. 6. Chemical Structure and Physical Properties of Organic-Inorganic Metal Halide Materials for Solid State Solar Cells

   Författare :Majid Safdari; James M. Gardner; Timothy Kelly; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Perovskite; Solar cells; Organic-inorganic lead halide; Dimensionality; Bandgap; X-ray diffraction; X-ray spectroscopy.; Kemi; Chemistry;

   Sammanfattning : AbstractMethylammonium lead (II) iodide has recently attracted considerable interest which may lead to substantial developments of efficient and inexpensive industrial photovoltaics. The application of this material as a light-absorbing layer in solid-state solar cells leads to impressive efficiency of over 22% in laboratory devices. LÄS MER

3. 7. Modeling hybrid halide perovskites for solar cell applications : Simulations of electronic structure and X-ray spectroscopy

   Författare :Cody M. Sterling; Michael Odelius; Alison B. Walker; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Solar cells; perovskites; computational chemistry; simulations; electronic structure; density functional theory; X-ray spectroscopy; kemisk fysik; Chemical Physics;

   Sammanfattning : Over the past 13 years, perovskites have become a very promising candidate in the search for cheap and effective photovoltaic materials for solar cells.  Perovskite solar cell power conversion efficiency has increased from 3. LÄS MER

4. 8. Phase-Contrast and High-Resolution Optics for X-Ray Microscopy

   Författare :Olof von Hofsten; Ulrich Vogt; Ian McNulty; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Microscopy; X-ray optics; X-ray microscopy; Soft X-ray physics; Optics; Optik; Physics; Fysik;

   Sammanfattning : X-ray microscopy is a well-established technique for nanoscale imaging. Zone plates are used as microscope objectives and provide high resolution, approaching 10 nm, currently limited by fabrication issues. This Thesis presents zone plate optics that achieve either high resolution or phase contrast in x-ray microscopy. LÄS MER

5. 9. Ion dynamics in insulin-producing cells : elemental changes after momentary stimulation detected by electron and proton induced X-ray emission

   Författare :Eva Pålsgård; Uppsala universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

   Sammanfattning : .... LÄS MER

7. 10. Ab initio simulations of core level spectra : Towards an atomistic understanding of the dye-sensitized solar cell

   Författare :Ida Josefsson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; multiconfigurational quantum chemistry; CASSCF calculations; core-level spectroscopy; x-ray photoelectron spectroscopy; x-ray absorption; resonant x-ray scattering; dye solar cells; transition metals; kemisk fysik; Chemical Physics;

   Sammanfattning : The main focus of this thesis is ab initio modeling of core level spectra with a high-level quantum chemical description both of the chemical interactions and of local atomic multiplet effects. In particular, the combination of calculations and synchrotron-based core-level spectroscopy aims at understanding the local structure of the electronic valence in transition metal complexes, and the details of the solvation mechanisms of electrolyte solutions, systems relevant for the dye-sensitized solar cell. LÄS MER