Silicon Photonics IV: Innovative Frontiers

0554097 - FZÚ 2022 RIV CH eng M - Část monografie knihy
Dohnalová, K. - Kůsová, Kateřina
Optical properties of Si nanocrystals enhanced by ligands.
Topics in Applied Physics. In: Silicon Photonics IV: Innovative Frontiers. Cham: Springer, 2021 - (Lockwood, D.; Pavesi, L.), Roč. 139 (2021), s. 3-65. Topics in Applied Physics, 139. ISBN 978-3-030-68221-7
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA18-05552S
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: silicon nanocrystal * photoluminescence * surface * theory
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

Compared to bulk silicon, silicon nanocrystals (Si-NCs) show modified properties, such as tunable emission and enhanced radiative rate, as a result of the quantum confinement, surface chemistry and environment. While the effect of quantum confinement is well understood and experimentally confirmed on the hydrogen-capped Si-NCs, the surface effects in Si-NC with other types of ligands can be very complex and hard to predict. In our work, we argue that the surface chemistry, be it ligands and/or shell, can be designed to further improve the radiative rate of the Si-NCs, beyond what is achievable by the quantum confinement alone. Our experimental work shows a number of effects that indicate that in many instances, the core and surface capping cannot be separated, and optical properties cannot be clearly interpreted as “extrinsic” (related to the surface capping agent) or “intrinsic” (related to the core only).
Trvalý link: http://hdl.handle.net/11104/0328736