Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
DOI: https://doi.org/10.29363/nanoge.nipho.2019.013
Publication date: 21st November 2018
The low defect density in halide perovskites (HaPs) is a welcome present for most device applications, one that has certainly increased the popularity of these materials. Still, we should pause a minute and ask what are the fundamental reasons that allow a material that can be made in “quick and dirty” (albeit not always reproducible) fashion at low temperatures (around RT), at times in ambient, as films or single crystals to have such low defect density (down to 1014 cm-3 for solution-grown and 1013 cm-3 for vacuum-deposited films and 1010 cm-3 or less for single crystals). I note that these defect densities are all deduced from the common measurements for charged or neutral imperfections, which are indirect ones. Still also more direct, qualitative measurements, such as surface photovoltage, differential external quantum efficiency, scanning tunneling and photothermal deflection spectroscopies, all indicate GaAs-like or lower defect densities.
I hope to show in 3.5 months from writing these lines that this behaviour reflects a fundamental property of these materials, with a rather simple basis. The talk will combine experimental results from several sources, including our own, for thermodynamic, optical, and electrical data. It is plausible that our conclusions can be generalized to help look for other ultra-low defect density materials.
The work is done with Igor Lubomirsky, Yevgeny Rakita (part of his PhD thesis) and Gary Hodes.
I thank David Egger (Regensburg), Omer Yaffe, Leeor Kronik (Weizmann Inst.) and others for ongoing discussions.
Support,from the Minerva Centre for Self-Repairing Systems for Energy & Sustainability at the Weizmann Institute, is gratefully acknowledged.
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.