Zn-Alloyed CsPbI<sub>3</sub> Nanocrystals for Highly Efficient Perovskite Light-Emitting Devices.
basic_science · Level V
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- Record sourced from PubMed, PMID 30741555.
- Also identified by DOI 10.1021/acs.nanolett.8b04339.
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Abstract
We alloyed Zn<sup>2+</sup> into CsPbI<sub>3</sub> perovskite nanocrystals by partial substitution of Pb<sup>2+</sup> with Zn<sup>2+</sup>, which does not change their crystalline phase. The resulting alloyed CsPb<sub>0.64</sub>Zn<sub>0.36</sub>I<sub>3</sub> nanocrystals exhibited an improved, close-to-unity photoluminescence quantum yield of 98.5% due to the increased radiative decay rate and the decreased non-radiative decay rate. They also showed an enhanced stability, which correlated with improved effective Goldschmidt tolerance factors, by the incorporation of Zn<sup>2+</sup> ions with a smaller radius than the Pb<sup>2+</sup> ions. Simultaneously, the nanocrystals switched from n-type (for CsPbI<sub>3</sub>) to nearly ambipolar for the alloyed nanoparticles. The hole injection barrier of electroluminescent LEDs was effectively eliminated by using alloyed CsPb<sub>0.64</sub>Zn<sub>0.36</sub>I<sub>3</sub> nanocrystals, and a high peak external quantum efficiency of 15.1% has been achieved.