Synthesis of highly efficient and stable CH3NH3PbBr3 perovskite nanocrystals within mesoporous silica through excess CH3NH3Br method

Su, Mei1,2,3; Wu, Dan3; Fan, Bo1; Wang, Fang1; Wang, Kai3; Luo, Zhongkuan1

2018-08

10.1016/j.dyepig.2018.02.010

DYES AND PIGMENTS   影响因子和分区

0143-7208

1873-3743

Templated synthesis of CH3NH3PbBr3 perovskite nanocrystals is facile, high-yield, ligand-free, and is another effective method aside from the colloidal method. However, the quantum yield (QY) is still inferior to that of the colloidal synthesized ones. In this report, we show that CH3NH3PbBr3 nanocrystal within mesoporous silica with QY of 75% and full width at half-maximum (FWHM) of 22 nm are obtained through manipulating the molar ratio of CH3NH3Br versus PbBr2 in precursor solution. It is found that excess CH3NH3Br can passivate the surface trap states, reduce nanocrystal size and narrow down the size distribution effectively. These features contribute to the rising of QY, blue-shifting of emission maximum and narrowing down of FWHM. The influence of excess CH3NH3Br can be interpreted in terms of enrichment on the interface of solvent/air because of amphipathy. Moreover, these CH3NH3PbBr3 - mesoporous silica composites present good stability. They preserve 90% of its initial QY after a storage in wet weather with relative humidity of 70 +/- 5% for 3 months. The synthesis method proposed in this research provides an effective way to achieve perovskite nanocrystals within mesoporous silica with high efficiency and stability.

Template Perovskite nanocrystals Stability Trap state Amphipathy

SCI ; EI

英语

通讯

Foshan Innovation Project[2014IT100072]

Chemistry ; Engineering ; Materials Science

Chemistry, Applied ; Engineering, Chemical ; Materials Science, Textiles

WOS:000433650300004

ELSEVIER SCI LTD

20181204919984

Charge trapping ; Chelation ; Convergence of numerical methods ; Full width at half maximum ; Lead compounds ; Mesoporous materials ; Nanocrystals ; Perovskite ; Silica

Minerals:482.2 ; Nanotechnology:761 ; Chemical Reactions:802.2 ; Mathematics:921 ; Numerical Methods:921.6 ; Atomic and Molecular Physics:931.3

CHEMISTRY

Web of Science

1.Shenzhen Univ, Coll Chem & Environm Engn, Shenzhen 518000, Peoples R China
2.Shenzhen Univ, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Coll Optoelect Engn, Shenzhen 518000, Peoples R China
3.Southern Univ Sci & Technol, Shenzhen 518000, Peoples R China

Su, Mei,Wu, Dan,Fan, Bo,et al. Synthesis of highly efficient and stable CH3NH3PbBr3 perovskite nanocrystals within mesoporous silica through excess CH3NH3Br method[J]. DYES AND PIGMENTS,2018,155:23-29.

Su, Mei,Wu, Dan,Fan, Bo,Wang, Fang,Wang, Kai,&Luo, Zhongkuan.(2018).Synthesis of highly efficient and stable CH3NH3PbBr3 perovskite nanocrystals within mesoporous silica through excess CH3NH3Br method.DYES AND PIGMENTS,155,23-29.

Su, Mei,et al."Synthesis of highly efficient and stable CH3NH3PbBr3 perovskite nanocrystals within mesoporous silica through excess CH3NH3Br method".DYES AND PIGMENTS 155(2018):23-29.