Films minces à base de Si nanostructuré pour des cellules ...

two kinds of emitters in SRSO sublayer and one kind of emitter in SRSN sublayers
towards a deeper understanding.
5.7 Summary
This chapter deals with modeling the pump prole within the thin lm, and emission
from the thin lm. The results obtained can be summarized as follows:
ˆ The pump intensity varies with angle of incidence. With 45° incidence of Ar
laser during PL experiments, the pump intensity is lower than that obtained
from normal incidence.
tel-00916300, version 1 - 10 Dec 2013
ˆ For a given condition, the position and intensity of the pump varies nonmonotonously
only by varying the thin lm thickness. This is attributed to
the thickness dependent reections in the lm.
ˆ With increasing losses, the pump intensity decreases. The pump prole varies
monotonously with refractive index.
ˆ Even if the emitters are homogeneously distributed within the thin lm, they
are subjected to a variable pump prole. Consequently, the distribution of
excited emitters follows the pump prole.
ˆ When the dynamic gain exceeds the dynamic losses, emission peak is evidenced
in medium 1.
ˆ The emission spectra varies non-monotonously with thickness, and refractive
index. Even slight variations of these parameters inuence the shape of the
curves.
ˆ Simulation of SRSO/SiO 2 MLs conrms the presence of two kinds of emitters
in SRSO sublayers.
ˆ Simulation of SRSO/SRSN MLs indicates that both SRSO and SRSN sublayers
contain emitters.
ˆ The low energy peak (peak 1) is attributed to the second kind of emitter in
SRSO sublayer.
ˆ The eect of optical cavity is noticed on the emission spectra.
165