Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Mixed-halide lead perovskites have attracted intense attention in the field of photovoltaics and other optoelectronic applications over the past few years. The remarkable properties of this material including high photoluminescence quantum yields (PLQYs) and easy bandgap tunability opens up applications for perovskites as coloured emitters and lasers; high emission yields are also a prerequisite for excellent solar cells. Recently, substantial enhancements have been achieved in the external quantum efficiencies of perovskite light-emitting diodes (PLEDs). However, these devices still have limitations associated with their bandgap stability, lifetime, and reproducibility. Here, we report a significant enhancement in the electroluminescence quantum efficiency, and operational lifetime in PLEDs by adding potassium additives to the emitting triple-cation perovskite layer. We also demonstrate the inhibition of bandgap instability and photoinduced ion-migration in passivated perovskite devices. Transient photoluminescence measurements show the reduction in the fast non-radiative decay with passivation when interfaced with LED device contacts. From STEM–EDX elemental analyses, we observe that potassium passivated LEDs are more chemically stable under continuous operation due to reduced ionic migration within and between layers of the device stack. These results are promising for pushing LEDs and solar cells towards their radiative limits and necessary operational stability requirements for commercialisation.
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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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