Organic–inorganic hybrid perovskite materials are emerging as highly attractive semiconductors for use in optoelectronics. In addition to their use in photovoltaics, perovskites are promising for realizing light-emitting diodes (LEDs) due to their high colour purity, low non-radiative recombination rates and tunable bandgap. Here, we report highly efficient perovskite LEDs enabled through the formation of self-assembled, nanometre-sized crystallites. Large-group ammonium halides added to the perovskite precursor solution act as a surfactant that dramatically constrains the growth of 3D perovskite grains during film forming, producing crystallites with dimensions as small as 10 nm and film roughness of less than 1 nm. Coating these nanometre-sized perovskite grains with longer-chain organic cations yields highly efficient emitters, resulting in LEDs that operate with external quantum efficiencies of 10.4% for the methylammonium lead iodide system and 9.3% for the methylammonium lead bromide system, with significantly improved shelf and operational stability.
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Nanoscale Research Letters Open Access 02 August 2022
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We acknowledge a DARPA Young Faculty Award (award no. D15AP00093) for research funding. B.P.R. acknowledges the support of a DuPont Young Professor Award for research funding. R.A.K. acknowledges support from the National Science Foundation Graduate Research Fellowship under grant no. DGE 1148900.
The authors declare no competing financial interests.
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Xiao, Z., Kerner, R., Zhao, L. et al. Efficient perovskite light-emitting diodes featuring nanometre-sized crystallites. Nature Photon 11, 108–115 (2017). https://doi.org/10.1038/nphoton.2016.269
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