Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
DOI: https://doi.org/10.29363/nanoge.hopv.2024.009
Publication date: 6th February 2024
Halide perovskites display outstanding photoluminescence quantum yield, tunable emission and simple deposition, which make them attractive for optoelectronics. At the same time, their facile ion migration and transformation under optical, electrical and chemical stress are seen as a major limitation. Mixed halide perovskites are particularly problematic since optical excitation can cause changes in the bandgap that are detrimental for solar cell and light-emitting diode efficiency and stability. Instead of preventing such changes, in this work I will discuss how we are exploiting photo-induced halide segregation in perovskites to enable responsive, reconfigurable and self-optimizing materials. First, I will detail how we can train a mixed halide perovskite film to give directional light emission using a nanophotonic microlens: through a self-optimized process of halide photosegregation, the system mimics the training stimulus.[1] Longer training leads to more highly directional emission, while different halide migration kinetics in the light (fast training) and dark (slow forgetting) allow for material memory. This self-optimized material performs significantly better than lithographically aligned quantum dots, because it eliminates lens-emitter misalignment and automatically corrects for lens aberrations. The system shows a combination of mimicking, improving over time, and memory, which comprise the basic requirements for learning, and give the intriguing prospect of intelligent optoelectronic materials. Second, I will show how we are trying to use this phenomenon to make self-tracking solar concentrators that can utilize diffuse light, including optical and full device simulations benchmarked by absorption and luminescence measurements.[2] I will conclude by discussing some surprising results we find in the time-dependence of photoluminescence quantum yield, which vary dramatically with slight changes in material composition and interfacial passivation layer.
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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.
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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.
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