Electron-phonon coupling and localization of excitons in single silicon nanocrystals

Nano Letters
Jörg MartinChristian von Borczyskowski

Abstract

We report a detailed photoluminescence (PL) study on single silicon nanocrystals produced by laser pyrolysis. The PL spectra reveal nearly homogeneously broadened zero-phonon lines coupled to Si-O-Si phonon transitions in the SiO2 shell. A systematic investigation of electron-phonon coupling is reported on the basis of single nanocrystals. The stepwise localization of electron and hole at the Si-SiO2 interface for nanocrystals smaller than d approximately 2.7 nm is driven by electron-phonon coupling. From the localization energies the effective Bohr radii of the (localized) electron and hole are estimated to be in the range of 1-2 bond lengths of Si-O and Si-Si.

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Citations

Jul 26, 2008·Nature Nanotechnology·Charles H Mielke, Alexander V Balatsky
Jun 8, 2013·The Journal of Chemical Physics·Jonathan MooneyPatanjali Kambhampati
Feb 20, 2016·Scientific Reports·Freddy T RabouwCelso de Mello Donega
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Dec 17, 2016·Nanotechnology·Ilya SychugovJan Linnros
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Nov 10, 2017·Small·Bart van DamKaterina Dohnalová
Jan 17, 2014·Science and Technology of Advanced Materials·Batu Ghosh, Naoto Shirahata
May 12, 2021·Chemical Society Reviews·Mohammad Malekzadeh, Mark T Swihart
Jul 25, 2020·Journal of the American Chemical Society·Hui WangYi Xie
Apr 16, 2019·Nano Letters·Andre NeumannAlexander Högele

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