Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.117
Publication date: 18th July 2019
The major efficiency limit in conventional solar cells is imposed by the rapid relaxation of above-bandgap “hot” carriers via electron-phonon coupling. To battle this limitation a number of non-trival photophysical phenonmena are investigated including singlet fission, carrier multiplication and hot carrier extraction. Lead-halide perovskites (LHPs) currently hold the efficiency record for solution-processable solar cells, and previous observations of slow hot-carrier cooling in these materials have piqued a deeper interest into their application in disruptive next-generation photovoltaics. However a coherent picture of carrier-carrier and carrier-phonon interactions in these systems is still under development.
Here we implement an ultrafast “pump-push-probe” technique to study the sub-ps cooling in LHP materials and use the observed cooling dynamics as probes for carrier-carrier and carrier-phonon interactions. We demonstrate that cooling in the all-inorganic CsPbBr3 is slower than its hybrid counterparts (e.g. FAPbBr3) in the high carrier density regime, owing to the relative abundance of optical phonon modes associated with the organic cation. The specific rates of cooling and their dependence on the hot and cold carrier densities are used to extract polaron sizes and coupling parameters for different perovskite materials. We scrutinise the thermal equilibration between cold and hot states in the single- and multiple-exciton-per-NC cases, and remark on the effect of surface ligands on the cooling dynamics.
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.