AUTHOR=Liu Min , Li Zhichun , Zheng Weilin , Kong Long , Li Liang 

TITLE=Improving the Stability of CsPbBr3 Perovskite Nanocrystals by Peroxides Post-treatment

JOURNAL=Frontiers in Materials

VOLUME=6

YEAR=2019

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2019.00306

DOI=10.3389/fmats.2019.00306

ISSN=2296-8016

ABSTRACT=<p>Metal oxides exhibit excellent barrier properties against moisture and oxygen, which are regarded as the powerful candidate for boosting the stability of perovskite nanocrystals (NCs). Here, we develop a simple method to coat perovskite NCs with PbO by peroxides post-treatment. Firstly, the didodecyl dimethyl ammonium sulfide (DDAS) was used to modify the CsPbBr<sub>3</sub> NCs (DDAS-CsPbBr<sub>3</sub>), and then sequentially treated with benzoyl peroxide (BPO). By this way, the self-metal source (lead) can be easily oxidized, leading to the quick growth of lead oxide (PbO) on the surface of individual CsPbBr<sub>3</sub> NCs. Under illumination with a 450 nm LED light (175 mW/cm<sup>2</sup>), the PbO coated CsPbBr<sub>3</sub> NCs maintained at ~90% of the initial intensity for 20 h of operations; in contrast, the emission from the CsPbBr<sub>3</sub> NCs completely quenched.</p>