Publication date: 28th August 2024
Suppression of ion migration for stable perovskite LEDs
The external quantum efficiency (EQE) of perovskite LEDs (PeLEDs) has dramatically improved to above 20% in the past few years. Operation stability becomes the one of the most challenging issue for the application of perovskite LEDs. Ion migration was acknowledged to be one of the main causes of degradation of perovskite LEDs.
In this talk, we will first discuss the effect of ion migration on the device performance and stability. We then will present our efforts to improve the stability of PeLEDs, including 1) suppressed ion migration in tin halide PeLEDs under device working conditions. In contrast to lead halide perovskites, no ion migration or phase segregation was observed in tin halide perovskites under illumination or an electric field. The origin was attributed to a much stronger Sn-halide bond and higher ion migration activation energy (Ea), which remain nearly constant under illumination. We further figured out the threshold Ea for the absence of ion migration to be around 0.65 eV. 2) Suppressed ion migration in perovskite single-crystal LEDs with enhanced operation stability. We used a space-confined inverse-temperature crystallization method to directly grow thin single crystals on top of hole transport layer. The MA0.8FA0.2PbBr3 based single crystal PeLEDs exhibited a decent EQE of 11.2%, a peak luminance of 84000 cd/m2, and a T50 lifetime of 12,500 hours at an initial luminance of 100 cd m−2, representing a 16,000-fold enhancement relative to the polycrystal PeLEDs.
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.