Sökning: "carrier lifetimes"
Visar resultat 1 - 5 av 10 avhandlingar innehållade orden carrier lifetimes.
1. InP-based photonic crystals : Processing, Material properties and Dispersion effects
Sammanfattning : Photonic crystals (PhCs) are periodic dielectric structures that exhibit a photonic bandgap, i.e., a range of wavelength for which light propagation is forbidden. The special band structure related dispersion properties offer a realm of novel functionalities and interesting physical phenomena. LÄS MER
2. Impact of carrier localization on recombination in InGaN quantum wells with nonbasal crystallographic orientations
Sammanfattning : The modern InGaN technology demonstrates high efficiencies only in the blue spectral region and low current operation modes. The growth of InGaN quantum wells (QWs) on nonbasal crystallographic planes (NBP) has potential to deliver high-power blue and green light emitting diodes and lasers. LÄS MER
3. Carrier Lifetime Relevant Deep Levels in SiC
Sammanfattning : Silicon carbide (SiC) is currently under development for high power bipolar devices such as insulated gate bipolar transistors (IGBTs). A major issue for these devices is the charge carrier lifetime, which, in the absence of structural defects such as dislocations, is influenced by point defects and their associated deep levels. LÄS MER
4. 4H-SiC epitaxy investigating carrier lifetime and substrate off-axis dependence
Sammanfattning : Silicon carbide (SiC) is a wide bandgap semiconductor with unique material properties making it useful for various device applications using high power, high frequency and high temperature. Compared to Si-based electronics, SiC based electronics have an improved energy efficiency. LÄS MER
5. Time-Resolved Photoemission Electron Microscopy: Development and Applications
Sammanfattning : Time-resolved photoemission electron microscopy (TR-PEEM) belongs to a class of experimental techniquescombining the spatial resolution of electron-based microscopy with the time resolution of ultrafast opticalspectroscopy. This combination provides insight into fundamental processes on the nanometer spatial andfemto/picosecond time scale, such as charge carrier transport in semiconductors or collective excitations ofconduction band electrons at metal surfaces. LÄS MER