About this Research Topic
All inorganic and organic-inorganic metal halide perovskite nanocrystals (PNCs) have gained explosive interest as a superior source of photons and charges with high luminescence quantum yield and long carrier diffusion length compared to many other semiconductor NCs. The emergent photovoltaic application of such PNCs has raised the demand for a better understanding of the fundamental photophysical properties upon photoexcitation. Because of similar electron and hole effective masses, the free carrier (realized on above-bandgap excitation) and exciton (produced on resonant excitation) dynamics in PNCs are quite different from the conventional II-VI and III-V semiconductors. Addressing such processes, which take place on the ultrafast timescale, is of high scientific interest from the aspects of physics, chemistry, material science and device engineering. The proper insight of the ultrafast exciton and free carrier dynamics of these materials will enable the utilization of PNCs in photovoltaic as well as light-emitting devices.
This Research Topic mainly focuses on the recent advances on the fundamental properties that take place on the ultrafast timescale of the newly developed PNCs for enhanced optoelectronic performances. Research articles on the modification of optical and electronic properties through doping, alloying, by forming core-shell as well as changing dimensionality, which affects the ultrafast processes, are welcome under this topic. We also encourage contributions on multi-photon absorption and emission, multi-exciton generation, Auger processes, bi-exciton generation, spin-relaxation, trion and polaron formation which have direct consequences on the future development of these materials. Furthermore, we welcome detailed insights into the electron-phonon coupling due to the lattice vibrations of these soft PNCs, which can provide significant development towards fundamentally understanding of PNCs in terms of their stability, charge-carrier mobility and polaronic properties.
We invite submissions of Original Research articles and Reviews/Mini-reviews/Perspectives on ultrafast processes that deal with the optical and electronic properties of different perovskite nanocrystals, including (but not limited to):
• Exciton and free-carrier dynamics
• Electron transfer, hole transfer involving PNCs
• Doping induced optical and electronic properties
• Phonon vibrational dynamics
• Defect bound carrier dynamics
• Ultrafast processes in perovskite heterostructures
• Polarization anisotropy and spin dynamics
• Direct and indirect PNCs
Keywords: perovskite nanocrystals, ultrafast spectroscopy, exciton dynamics, electron and hole transfer, phonons
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