https://doi.org/10.1140/epjd/e2011-10513-x
Regular Article
Photoluminescence dynamics of organic molecule-passivated Si nanoclusters
1
Synchrotron Light Application Center/Saga
University, 1 Honjo,
840-8502
Saga,
Japan
2
Department of Mechanical Engineering/Kobe
University, Nada-ku,
Kobe,
Japan
3
Research Center for Ultra-High Voltage Electron Microscopy/Osaka
University, Ibaraki, Osaka,
Japan
4
Department of Applied Chemistry/Tokyo University of
Science, Shinjuku,
Tokyo,
Japan
a e-mail: mimamura@cc.saga-u.ac.jp
Received:
16
September
2010
Received in final form:
22
January
2011
Published online:
17
June
2011
The size-selected phenyl-passivated Si nanoclusters with the mean diameters of 1.5 and 1.3 nm have been prepared in the solution route. The intense PL observed in Si nanoclusters, in which the band gap energies increase up to approximately 4 eV, originates from electron-hole pair recombination. From time-resolved PL, two kinds of exponential PL decay components with fast and slow lifetime were observed. The identical decays with slow lifetime will be derived from the surface states of Si nanoclusters passivated by phenyl molecules. The size-dependent zero-phonon assisted optical transitions by quantum size effects occur at a high rate of sub-nanosecond timescale.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011
