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Silicon Nanophotonics. Basic Principles, Present Status, and Perspectives
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SYSNO ASEP 0471613 Document Type M - Monograph Chapter R&D Document Type Monograph Chapter Title Band structure of silicon nanocrystals Author(s) Kůsová, Kateřina (FZU-D) RID, ORCID
Hapala, Prokop (FZU-D) RID, ORCID
Jelínek, Pavel (FZU-D) RID, ORCID
Pelant, Ivan (FZU-D) RID, ORCID, SAISource Title Silicon Nanophotonics. Basic Principles, Present Status, and Perspectives. - Singapore : Pan Stanford Publishing, 2016 / Khriachtchev L. - ISBN 978-981-4669-76-4 Pages s. 109-144 Number of pages 36 s. Number of pages 503 Publication form Print - P Language eng - English Country SG - Singapore Keywords silicon nanocrystals ; band structure ; luminescence properties Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GBP108/12/G108 GA ČR - Czech Science Foundation (CSF) GPP204/12/P235 GA ČR - Czech Science Foundation (CSF) GA14-02079S GA ČR - Czech Science Foundation (CSF) Institutional support FZU-D - RVO:68378271 DOI 10.1201/9781315364797-5 Annotation This chapter puts on a rigorous basis the concept of electronic band structure in semiconductor nanocrystals. We show that, down to a certain limit, this concept has still reasonable meaning, even if the band structure becomes gradually “fuzzy” and minigaps appear within the allowed energy bands with decreasing nanocrystal size. The nanocrystals basically remember the basic features of their “parent” bulk material. In particular, we demonstrate that hydrogen-capped silicon nanocrystals, fully relaxed geometrically and electronically, retain the indirect-bandgap structure down to ≤2 nm. Moreover, we reveal, both computationally and experimentally, that mechanical (tensile) strain applied to the Si nanocrystals via proper surface capping makes these nanocrystals a direct-bandgap material, putting them on a par with standard direct-bandgap semiconductors like GaAs. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2017
Number of the records: 1