Publication date: 18th August 2023
Colloidal lead halide perovskite (LHP) nanocrystals (NCs) can be considered a promising class of quantum light emitter for the next generation of optoelectronic devices. Anisotropic shapes of LHP NCs play an important role in their optical properties. Thus, it is highly required to implement an in-depth study of structure and property correlations. There have been plenty of reports on the CsPbBr3 nanoplatelets (NPs), nanowires (NWs), and a few investigations on the CsPbBr3 NRs. Semiconductor NRs offer a linearly polarized light emission. Thus, the 1D anisotropy along with strong confinement make these structures interesting for further study.[1]
In this study, CsPbI3 NRs have been synthesized based on an improved chemical transformation method where the addition of water to Cs4PbI6 NCs induces transformation to CsPbI3 NRs with different controlled aspect ratios and photoluminescence quantum yields (PLQY) of up to 80%. Previously, the instability of NRs hampered their detailed study leaving a gap in the detailed discussion of geometry-specific optical properties. However, we have developed a synthesis scheme for strong confined CsPbI3 NRs with increasing stability that enables further structural and optical study.
NRs are known to emit linearly polarized light, indicating the existence of dipole moment along with the long axis of the NRs.[1] Optical anisotropy can originate both from the asymmetry of the crystal lattice, or the habit of the finite crystal. In this work, we wish to explore the emission anisotropy of inorganic LHP NRs using a newly developed approach that combines defocused imaging with heralded spectroscopy of single NRs.[2] For this we have used an innovative single photon avalanche diode (SPAD) array onto which the out-of-focus dipole emission pattern can be imaged, and resolved in time and space, allowing the direct observation and quantification of the difference between the emission transition dipole of the first and second excited states revealing multi-excitonic interactions in single perovskite NRs.[1-2]
The authors would like to thank Daniel for assisting with the measurements and characterization of the SPAD23 detector and Gur for the fruitful discussion and technical support in the SPAD23 system and Miri Kazes for assistance with supporting experiments.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.