Search for dissertations about: "hot carrier"

Showing result 1 - 5 of 40 swedish dissertations containing the words hot carrier.

2. 1. Hot-carrier extraction in nanowires

   Author : Jonatan Fast; NanoLund: Centre for Nanoscience; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Nanowire; Hot carrier; photovoltaic; Thermoelectric; Fysicumarkivet A:2023:Fast;

   Abstract : A hot-carrier solar cell aims to generate power from energetic, photoexcited, charge carriers, so called hot carriers, in order to reach higher conversion efficiencies than current solar cell technology.Creating a hot-carrier solar cell has proven challenging for two main reasons: hot carriers lose their energy very quickly, and they need to be extracted over distances of a few hundrednanometers via energy selective filters. READ MORE

4. 2. Charge Separation on Localized Surface Plasmon and Hot Carrier Transfer to Semiconductors

   Author : Yocefu Hattori; Jacinto Sá; Stephan Link; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Plasmonics; hot carrier; metal nanoparticles; semiconductors; ultrafast transient absorption spectroscopy; Chemistry with specialization in Physical Chemistry; Kemi med inriktning mot fysikalisk kemi;

   Abstract : The relatively recent discovery that plasmonic nanoparticles generate energetic electron-hole pairs known as hot carriers has been the source of interest from many scientific groups. The capability to extract these short-lived hot carriers from metal nanoparticles (NPs) might potentially lead to applications in solar cells, photodetection, and photocatalysis. READ MORE

5. 3. Graphene Hot-electron Transistors

   Author : Sam Vaziri; Mikael Östling; Max Lemme; Suman Datta; KTH; []
   Keywords : Graphene; hot-electron transistors; graphene base transistors; GBT; cross-plane carrier transport; tunneling; ballistic transport; heterojunction transistors; graphene integration; graphene transfer; Informations- och kommunikationsteknik; Information and Communication Technology;

   Abstract : Graphene base transistors (GBTs) have been, recently, proposed to overcome the intrinsic limitations of the graphene field effect transistors (GFETs) and exploit the graphene unique properties in high frequency (HF) applications. These devices utilize single layer graphene as the base material in the vertical hot-electron transistors. READ MORE

6. 4. Hot-carrier generation and strong coupling in metal nanoparticles

   Author : Jakub Fojt; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; hot carriers; strong coupling; nanoparticles; nanoplasmonics;

   Abstract : Metal nanoparticles are an emerging platform for energy applications such as photovoltaics, solar-to-fuel conversion and photocatalysis. Nanoparticles confine the oscillating electromagnetic field of visible light to very small volumes, which allows for efficient absorption and scattering of light in the solar spectral range. READ MORE

7. 5. Time-Resolved Photoemission Electron Microscopy: Development and Applications

   Author : Lukas Wittenbecher; NanoLund: Centre for Nanoscience; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; PEEM; time-resolved PEEM; ultrafast optics; pulse shaping; plasmonics; semiconductor nanowires; hot electrons; ultrafast microscopy; charge carrier relaxation;

   Abstract : 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. READ MORE