Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.025
Publication date: 6th July 2018
Recently, the low-temperature solution-processed metal-halide perovskites have demonstrated great potential in light harvesting applications. The light to electricity power conversion efficiency up to 23.25% has been achieved. The primary advantages of these lead based perovskites for solar cells are the large photon absorption coefficient, long-range balanced charge carrier diffusion lengths, low trap density, high charge carrier mobility, fast and efficient photo-generated exciton dissociation and slow electron-hole bimolecular recombination. Additional to these properties, the tunable optical direct bandgap over a wide range also makes these perovskites good candidates for using in light emission applications (Lasing & Electroluminescence). However, the relatively slow electron-hole bimolecular recombination in the traditional three-dimensional perovskites that drives their outstanding photovoltaic performance is a fundamental limitation for the light emission. Here, we show that the perovskite light emission efficiency could be greatly enhanced by tailoring the bimolecular-type recombination in three-dimensional crystals to excitonic-type recombination in low-dimensional crystals.
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Acknowledgements: Financial support from the Macau Science and Technology Development Fund (FDCT-116/2016/A3 and FDCT-091/2017/A2), Research Grant (SRG2016-00087-FST and MYRG2018-00148-IAPME) from the University of Macau, the Natural Science Foundation of China (91733302, 61605073 and 2015CB932200) is gratefully acknowledged.
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