We focus on fabricating organic/inorganic halide perovskites with controlled dimensionality, size and composition and studying the optical and electrical properties of the resulting nanocrystals. By partially exchanging the most commonly used organic cation methylammonium for a cation with a larger chain we are able to fabricate two-dimensional nanoplatelets down to a single unit cell thickness.1 Through absorption and photoluminescence measurements we find that this leads to a strong-quantum size effect in the perovskites while additionally increasing the exciton bind energy to several hundreds of meV. We employ several fabrication techniques to increase the fluorescence quantum yield to be able to investigate single particles, and to study energy transport between individual nanocrystals by time-resolved spectroscopic methods. Our findings can lead to improvements in not only photovoltaic devices, but also for light-harvesting and light-emitting devices, such as LEDs and lasers.
(1) Sichert, J. A.; Tong, Y.; Mutz, N.; Vollmer, M.; Fischer, S.; Milowska, K. Z.; García Cortadella, R.; Nickel, B.; Cardenas-Daw, C.; Stolarczyk, J. K.; Urban, A. S.; Feldmann, J. Nano Letters 2015, 15, 6521.
Alexander S. Urban, Jasmina A. Sichert, Yu Tong, Verena Hintermayr, Lakshminarayana Polavarapu, Jacek K. Stolarczyk, and Jochen Feldmann, "Perovskite nanocrystals for light-emitting and energy harvesting applications
(Conference Presentation)," Proc. SPIE 9919, Nanophotonic Materials XIII, 99190Y (Presented at SPIE Nanoscience + Engineering: August 31, 2016; Published: 7 November 2016); https://doi.org/10.1117/12.2237583.5159519608001.
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