In:
physica status solidi c, Wiley, Vol. 8, No. 3 ( 2011-03), p. 979-984
Abstract:
We report on ultrafast photoluminescence (PL) spectroscopy of blue and red‐emitting silicon nanostructures. We prepared samples of porous Si with different dominating PL bands in time‐integrated PL spectrum. These samples show also striking differences in ultrafast PL dynamics. For the red‐emitting samples we observe rapid PL onset followed by a two‐exponential decay, which is spectrally dependent. For the blue‐emitting porous Si the PL builds up several picoseconds and decays mono‐exponentially with spectrally independent PL rise and decay times. Our results indicate that a dominant part of the blue and red emission comes from two distinct species with different energy states structures. This is furthermore supported by two‐photon absorption induced PL mea‐surements. The two‐photon and one‐photon absorption induced PL spectra, which are identical for the red‐emitting samples, differ substantially for the blue‐emitting ones. However, polarization properties of PL suggest that the blue PL band originates from several overlapping PL bands with sample‐dependent importance. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Type of Medium:
Online Resource
ISSN:
1862-6351
,
1610-1642
DOI:
10.1002/pssc.201000394
Language:
English
Publisher:
Wiley
Publication Date:
2011
detail.hit.zdb_id:
2105580-4
detail.hit.zdb_id:
2102966-0
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