Proceedings of nanoGe Fall Meeting 2021 (NFM21)
Publication date: 23rd September 2021
Metal halide perovskites are emerging as promising semiconductors for cost-effective and high performance light emitting diodes (LEDs). Previous investigations have focused on the optimization of the emissive perovskites. However, an in depth understanding of how the buried charge transport layers affect the perovskite crystallization is missing. Here, we reveal that efficient deprotonation of the undesirable organic cations by a metal oxide interlayer with a high isoelectric point, e.g. ZnO is critical to achieve highly emissive and fine tunable bandgap perovskite films for perovskite LEDs (Per LEDs). (1, 2) Combining our findings, we achieve high efficiency and bright NIR LEDs with fine tuning emission continuously filling the gap between CsPbI3 (700 nm) and FAPbI3 (800 nm). It is demonstrated that the interface induced cation exchange process is critical for achieving tunable bandgap values. Notably, all the resulting devices demonstrate high peak EQEs of over 15 %, representing the best-performing solution-processed NIR LEDs with tunable emissions.
This work was supported by the ERC Starting Grant (717026), the European Commission Marie Skłodowska-Curie Actions (691210), the National Key Research and Development Program of China (2016YFA0202402), Jiangsu High Educational Natural Science Foundation (18KJA430012), the Priority Academic Program Development of Jiangsu Higher Education Institutions, the 111 program and Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC). Z.Y. would like to thank the financial support from the China Scholarship Council. W.X. thanks the National Natural Science Foundation of China (61704077), the Natural Science Foundation of Jiangsu Province (BK20171007). W.X. is a Wenner-Gren Postdoc Fellow. F.G. is a Wallenberg Academy Fellow.
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.