Sökning: "band gap narrowing"
Hittade 4 avhandlingar innehållade orden band gap narrowing.
1. Atomic Scale Design of Clean Energy Materials : Efficient Solar Energy Conversion and Gas Sensing
Sammanfattning : The focus of this doctoral thesis is the atomic level design of photocatalysts and gas sensing materials. The band gap narrowing in the metal oxides for the visible-light driven photocatalyst as well as the interaction of water and gas molecules on the reactive surfaces of metal oxides and the electronic structure of kaolinite has been studied by the state-of-art calculations. LÄS MER
2. Electronic Structure of intrinsic and doped Silicon Carbide and Silicon
Sammanfattning : Silicon (Si) is the most exploited material within the semiconductor device technology, mainly due to its relatively good electron and hole mobilities and the simplicity to fabricate and process the material. Silicon carbide (SiC) has, however, a wider band gap, a higher breakdown electric field strength, and a higher thermal conductivity, which makes SiC one of the most promising materials for high-power devices. LÄS MER
3. Optical studies of carrier transport and fundamental absorption in 4H-SiC and Si
Sammanfattning : The Fourier transient grating (FTG) technique and a novelspectroscopic technique, both based on free carrier absorption(FCA) probing, have been applied to study the carrierdiffusivity in 4H-SiC and the fundamental absorption edge in4H-SiC and Si, respectively. FTG is a unique technique capable of detecting diffusioncoefficient dependence over a broad injection interval rangingfrom minority carrier diffusion to the ambipolar case. LÄS MER
4. Conjugated Luminescent Molecular Materials : An Experimental and Theoretical Study of Electronic, Optical and Chemical Properties of some Conjugated Molecules, Polymers and Interfaces
Sammanfattning : In recent years intensive studies of conjugated polymers and molecules have been carried out all over the world. The most promising use for these materials appears at the moment to be as the active luminescent component in flat panel displays. LÄS MER
