Halide perovskite is a promising candidate for high-performance and ultra-compact light emitters which are the core of the next-gen display technology. Despite various µ-Perovskite-LED array design availability, achieving finely controlled emission patterns, by implementing nanopatterns on the active media (metasurfaces), is a key challenge. In this work, we demonstrate a design and fabrication procedure for perovskite metasurface LED whose optical properties are controlled by nanopatterning. The obtained results pave the way for radiation control in perovskite LEDs and micro-LEDs.
The active layer morphology of vacuum deposited organic solar cells based on phthalocyanine-perylene donor-acceptor couple have been studied, comparing coevaporated bulk heterojunction with multilayer structures consisting in alternated donor and acceptor very thin layers. These latter devices show current-voltage behaviour indicating that their active layer acts as an interpenetrated network. They show better photovoltaic parameters, with power conversion efficiencies 2.5 time higher than the bulk heterojunctions, and better external quantum efficiencies. A compromise with vacuum evaporation growth rate has to be taken in order to realize the multilayer solar cells: high growth rate produces a better bulk interpenetrated structure giving rise to a better external quantum efficiency, but low growth rate favours the planar molecular arrangement that gives a better absorption of the perylene molecules. From the comparison between measurements held in open air and under dry nitrogen atmosphere, we think that multilayer solar cells seem to be far less sensible to open air condition than the coevaporated solar cells.
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