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This book highlights the rapidly emerging field of
solution-processed halide perovskite lasers. These amazing
materials not only possess exceptional photovoltaic properties, but
are also outstanding optical gain media. Halide perovskites are the
latest member of solution-processed optical gain media, joining
organics and traditional semiconductor colloidal quantum dots.
Amplified spontaneous emission and lasing have been demonstrated in
various halide perovskite configurations and nanostructures with
wavelengths tunable over the visible and infrared wavelengths
(400-1000 nm). This book provides comprehensive information on
perovskite lasing, starting with some fundamentals of lasers and
their basic operating principles. Unambiguous methods for
identifying lasing light emission are presented, while the basic
optoelectronic properties of perovskite materials are also
discussed, with an emphasis on their photophysics, using ultrafast
optical spectroscopy techniques. The viability of perovskites as a
gain media within a suitable resonator, as well as the
characterization methods for optical gain, are highlighted. The
book closes with a discussion on the remaining challenges (such as
electrical driven lasing and material stabilities) that need to be
tackled, and the future of this new family of lasers.
This book explores the incorporation of plasmonic nanostructures
into organic solar cells, which offers an attractive light trapping
and absorption approach to enhance power conversion efficiencies.
The authors review the latest advances in the field and discuss the
characterization of these hybrid devices using a combination of
optical and electrical probes. Transient optical spectroscopies
such as transient absorption and transient photoluminescence
spectroscopy offer powerful tools for observing charge carrier
dynamics in plasmonic organic solar cells. In conjunction with
device electrical characterizations, they provide unambiguous proof
of the effect of the plasmonic nanostructures on the solar cells'
performance. However, there have been a number of controversies
over the effects of such integration - where both enhanced and
decreased performance have been reported. Importantly, the new
insights into the photophysics and charge dynamics of plasmonic
organic solar cells that these spectroscopy methods yield could be
used to resolve these controversies and provide clear guidelines
for device design and fabrication.
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