||I U P A C
Organizations & People
Pure Appl. Chem. Vol.
72, Nos. 1-2, pp. 237-243, 2000
Special Topic Issue on the Theme of
Optical absorption property of oxidized free-standing porous silicon
Dongsheng Xu, Guolin Guo*, Linlin Gui, Youqi Tang, and G. G. Qin
*Institute of Physical Chemistry, Peking University,
Beijing 10871, P. R.China
Abstract: We have systematically studied the evolution of the
optical absorption of free-standing PS films during thermal oxidation
at 200°C in air. Our experiment results show the evolution of transmission
curve is quite complicated, which red-shifts first and then blue-shifts
during thermal oxidation. At the same time, the transmission at the
low energy decreases first and then increases. We propose an explanation
as follows: (1) the energy gap associated with each crystallite should
increase during thermal oxidation process, due to the quantum confinement
effect; (2) the energy gap should decrease with an increase in oxygen
termination atoms. Both the increasing of the gap due to the quantum
confinement effect and the decreasing of the gap due to the Si-O bond
formation cause a complicated evolution of optical absorption.
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