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Fig. 7.14 The polarization
charge distributions on the
surface of the cavity at the
wavelengths denoted with the
arrows of Fig.
7.13
. 2011
OSA; Ref. [
33
]
0.4
620 nm
650 nm
750 nm
0.2
0
−0.2
−0.4
−0.6
−0.8
−1
35
40
45
50
55
60
65
z (nm)
modes show more concentrated field at the gap between the DC-MS sphere and the
cavity, which can be seen in the inset of Fig.
7.13
. For the bonding mode, the
polarity of its polarization charge is marked in Fig.
7.9
. Due to the in-phase
plasmon oscillation
and
hybridization,
the
bonding
mode
is
superradiant
or
strongly radiative, and provides a great help for the optical enhancement.
In conclusion, the hybrid plasmonic system, which comprises the plasmonic
cavity coupled with the DC-MS nanosphere, can increase the optical absorption of
the OSC by fourfold. The significant enhancement mainly results from the cou-
pling of symmetric surface wave modes supported by the cavity resonator and
strongly depends on the decay length of surface plasmon waves penetrated into the
active layer. Furthermore, the coherent interplay between the cavity and the DC-
MS nanosphere is strongly demonstrated by our theoretical model. The bonding
coupling mode in the hybrid plasmonic system enhances the optical absorption
further. The work provides detailed physical explanations for the hybrid plasmonic
cavity device structure to enhance the optical absorption of organic photovoltaics.
7.5 Conclusion
In this topic chapter, we have reviewed the basic concepts, physical mechanisms,
and theoretical models for plasmonic effects in OSCs. Our results show that the
absorption and performance of OSCs can be significantly enhanced by incorpo-
rating metallic nanostructures. The unparalleled near-field concentration inherent
from plasmon resonances can break the half-wavelength limit in the optical design
of thin-film OSCs, which is particularly useful for high-performance ultracompact
photovoltaics.
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