Search for dissertations about: "conductivity mechanism"

Showing result 1 - 5 of 96 swedish dissertations containing the words conductivity mechanism.

2. 1. Understanding Ionic Conductivity in Crystalline Polymer Electrolytes

   Author : Daniel Brandell; Josh Thomas; Torbjörn Gustafsson; Peter G. Bruce; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Polymer electrolyte; molecular dynamics; conductivity mechanism; aliovalent anion substitution; smectic; nematic; polymer chain length; Kemi; Chemistry; Kemi;

   Abstract : Polymer electrolytes are widely used as ion transport media in vital applications such as energy storage devices and electrochemical displays. To further develop these materials, it is important to understand their ionic conductivity mechanisms. READ MORE

4. 2. Exploring Dye-Sensitized Mesoporous NiO Photocathodes : from Mechanism to Applications

   Author : Lei Tian; Haining Tian; Leif Hammarström; Fabrice Odobel; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NiO; p-type; dye-sensitized solar cells; solid state; charge separation; charge recombination; charge diffusion; transport time; surface states; electron conductor; dye regeneration; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

   Abstract : Increasing attention has been paid on solar energy conversion since the abundant solar energy possesses the potential to solve the problems on energy crisis and climate change. Dye-sensitized mesoporous NiO film was developed as one of the attractive photocathodes to fabricate p-type dye-sensitized solar cells (p-DSCs) and dye-sensitized photoelectrosynthetic cells (p-DSPECs) for electricity and chemical fuels generation, respectively. READ MORE

5. 3. Thermal conductivity of wide and ultra-wide bandgap semiconductors

   Author : Dat Tran; Plamen Paskov; Vanya Darakchieva; Martin Kuball; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; III-nitrides; β-Ga2O3; Thermal conductivity; Thermal transport;

   Abstract : This PhD thesis presents experimental and theoretical studies of the thermal conductivity of wide and ultra-wide bandgap semiconductors including GaN, AlN, β-Ga2O3 binary compounds, and AlxGa1−xN, ScxAl1−xN, YxAl1−xN ternary alloys. Thermal conductivity measurements are conducted using the transient thermoreflectance (TTR) technique and the results are interpreted using analytical models based on the solution of the Boltzmann transport equation (BTE) within the relaxation time approximation (RTA). READ MORE

6. 4. Electrochemical Characterizations of Conducting Redox Polymers : Electron Transport in PEDOT/Quinone Systems

   Author : Mia Sterby; Martin Sjödin; Maria Strömme; Rikard Emanuelsson; Adolf Gogoll; Robert Hillman; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Conducting Redox Polymer; PEDOT; Quinone; Charge transport; Conductivity; Organic Battery; Engineering Science with specialization in Nanotechnology and Functional Materials; Teknisk fysik med inriktning mot nanoteknologi och funktionella material;

   Abstract : Organic electrode materials for rechargeable batteries have caught increasing attention since they can be used in new innovative applications such as flexible electronics and smart fabrics. They can provide safer and more environmentally friendly devices than traditional batteries made from metals. READ MORE

7. 5. Building Systems for Electronic Probing of Single Low Dimensional Nano-objects : Application to Molecular Electronics and Defect Induced Graphene

   Author : Syed Hassan Mujtaba Jafri; Klaus Leifer; Aidan Quinn; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Graphene; defect induced graphene; molecular electronics; nanoelectrodes; nanoparticles; conductivity; junction; nanomaterial; focused ion beam; surface functionalization; electrical characterization; Teknisk fysik med inriktning mot materialanalys; Engineering Science with specialization in Materials Analysis;

   Abstract : Nano-objects have unique properties due to their sizes, shapes and structure. When electronic properties of such nano-objects are used to build devices, the control of interfaces at atomic level is required. READ MORE