Open AccessInfluence of Annealing Temperature on Structural Properties and Stability of CsPbBr3/TiO2 Core/Shell
Author(s) -
Pariuket,
Tetsuya Kida,
Paravee Vas-Umnuay
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/965/1/012023
Subject(s) - crystallinity , materials science , anatase , annealing (glass) , transmission electron microscopy , photoluminescence , chemical engineering , spectroscopy , crystallization , nanotechnology , optoelectronics , photocatalysis , composite material , chemistry , biochemistry , physics , quantum mechanics , engineering , catalysis
Although all-inorganic CsPbBr 3 perovskites quantum dots exhibit an excellent photophysical properties, which could be applied in various applications, they still suffer from poor structural stability owing to environment factors. Therefore, TiO 2 was coated on the CsPbBr 3 QDs as a protecting shell to enhance their stability. Moreover, anatase phase of TiO 2 shell was obtained by annealing at more than 300°C due to its most effective electron extraction properties among other crystalline forms of TiO 2 . However, the CsPbBr 3 QDs can be degraded under high temperature. Herein, the annealing temperatures ranging from 300-500°C were optimized to obtain the anatase TiO 2 shell and good crystallinity of CsPbBr 3 QDs core. The morphology and optical properties of CsPbBr 3 QDs, CsPbBr 3 /TiO x and CsPbBr 3 /TiO 2 were studied by using transmission electron microscope (TEM), photoluminescence (PL) measurement and UV-Visible spectroscopy, respectively. Finally, the CsPbBr 3 /TiO 2 annealed at the optimum temperature was compared with the bare CsPbBr 3 QDs to prove the enhancement of their structural stability under ambient air by using X-ray diffraction (XRD).