Search for dissertations about: "surface recombination."

Showing result 1 - 5 of 85 swedish dissertations containing the words surface recombination..

2. 1. Dissociative Adsorption of CO2 on Copper: The Role of Steps

   Author : Benjamin Hagman; Synkrotronljusfysik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; koppar; CO2; Copper surface; Carbon Dioxide : chemistry; Dissociative adsorption; Surface oxidation; Ambient pressure X-ray photoelectron spectroscopy APXPS ; Surface X-ray diffraction SXRD ;

   Abstract : CO2 chemistry has received significant interest in recent time, due to the greenhouse effects of CO2 emissions and the resulting climate change. CO2 reduction reactions, such as methanol synthesis and reverse water-gas shift, is providing a route for recycling of CO2 and thus limiting the CO2 emissions. 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. Alternative Redox Couples for Dye-Sensitized Solar Cells

   Author : Sandra Feldt; Anders Hagfeldt; Gerrit Boschloo; Petra Cameron; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; redox mediator; triphenylamine; cobalt; ferrocene; titanium dioxide; regeneration; recombination; Physical Chemistry; Fysikalisk kemi;

   Abstract : Dye-sensitized solar cells (DSCs) convert sunlight to electricity at a low cost. In the DSC, a dye anchored to a mesoporous TiO2 semiconductor is responsible for capturing the sunlight. READ MORE

6. 4. Endonuclease II - a GIY-YIG enzyme of bacteriophage T4

   Author : Pernilla Lagerbäck; Karin Carlson; Elisabeth Raleigh; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; GIY-YIG; EndoII; endonuclease; structure; tetramer; binding; nicking; recombination; Microbiology; Mikrobiologi;

   Abstract : Endonuclease II (EndoII) of bacteriophage T4 is a GIY-YIG enzyme involved in host DNA breakdown during phage infection of E. coli. EndoII combines features of restriction endonucleases with those of homing endonucleases in that it breaks down DNA foreign to itself but recognizes a 16 bp long asymmetric and ambiguous sequence. READ MORE

7. 5. Fabrication and Characterization of Silicon Carbide Power Bipolar Junction Transistors

   Author : Hyung-Seok Lee; Carl-Mikael Zetterling; Tat-Sing Chow; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicon carbide; power device; BJT; current gain; specific on resistance RSP_ON ; breakdown voltage; forward voltage drop; surface recombination; ohmic contact.; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

   Abstract : Silicon carbide bipolar junction transistors (BJTs) are attractive power switching devices because of the unique material properties of SiC with high breakdown electric field, high thermal conductivity and high saturated drift velocity of electrons. The SiC BJT has potential for very low specific on-resistances and this together with high temperature operation makes it very suitable for applications with high power densities. READ MORE