Determination of absorption cross-section of Si nanocrystals by two independent methods based on either absorption or luminescence
-
- J. Valenta
- Charles University 1 Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, , Ke Karlovu 3, 121 16 Prague 2, Czechia
-
- M. Greben
- Charles University 1 Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, , Ke Karlovu 3, 121 16 Prague 2, Czechia
-
- Z. Remeš
- Institute of Physics 2 , Academy of Sciences of the Czech Republic, Cukrovarnická 10, Prague 6, Czechia
-
- S. Gutsch
- Albert-Ludwigs-University Freiburg 3 Faculty of Engineering, IMTEK, , Georges-Köhler-Allee 103, 79110 Freiburg, Germany
-
- D. Hiller
- Albert-Ludwigs-University Freiburg 3 Faculty of Engineering, IMTEK, , Georges-Köhler-Allee 103, 79110 Freiburg, Germany
-
- M. Zacharias
- Albert-Ludwigs-University Freiburg 3 Faculty of Engineering, IMTEK, , Georges-Köhler-Allee 103, 79110 Freiburg, Germany
書誌事項
- 公開日
- 2016-01-11
- DOI
-
- 10.1063/1.4939699
- 公開者
- AIP Publishing
この論文をさがす
説明
<jats:p>Absorption cross-section (ACS) of silicon nanocrystals (SiNCs) is determined via two completely independent approaches: (i) Excitation-intensity-dependent photoluminescence (PL) kinetics under modulated (long square pulses) pumping and (ii) absorbance measured by the photothermal deflection spectroscopy combined with morphology information obtained by the high-resolution transmission electron microscopy. This unique comparison reveals consistent ACS values around 10−15 cm2 for violet excitation of SiNCs of about 3–5 nm in diameter and this value is comparable to most of direct band-gap semiconductor nanocrystals; however, it decreases steeply towards longer wavelengths. Moreover, we analyze the PL-modulation technique in detail and propose an improved experimental procedure which enables simpler implementation of this method to determine ACS of various (nano)materials in both solid and liquid states.</jats:p>
収録刊行物
-
- Applied Physics Letters
-
Applied Physics Letters 108 (2), 023102-, 2016-01-11
AIP Publishing