TY - JOUR
T1 - Photoelectrochemically active and environmentally stable cspbbr3/tio2 core/shell nanocrystals
AU - Li, Zhi Jun
AU - Hofman, Elan
AU - Li, Jian
AU - Davis, Andrew Hunter
AU - Tung, Chen Ho
AU - Wu, Li Zhu
AU - Zheng, Weiwei
N1 - Funding Information:
W.Z. acknowledges support from a start-up grant of Syracuse University. Z.-J.L. thanks support from the National Science Foundation of China (21403260). TEM and XPS measurements were performed at the Cornell Center for Materials Research (CCMR), which are supported through the NSF MRSEC program (DMR-1120296). The authors also thank Dr. Yan-Yeung Luk, Dr. Mathew M. Maye, and Laxmikant Pathade for assistance with FTIR, TGA, and XRD measurements, respectively.
Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
PY - 2018/1/4
Y1 - 2018/1/4
N2 - Inherent poor stability of perovskite nanocrystals (NCs) is the main impediment preventing broad applications of the materials. Here, TiO2 shell coated CsPbBr3 core/shell NCs are synthesized through the encapsulation of colloidal CsPbBr3 NCs with titanium precursor, followed by calcination at 300 °C. The nearly monodispersed CsPbBr3/TiO2 core/shell NCs show excellent water stability for at least three months with the size, structure, morphology, and optical properties remaining identical, which represent the most water-stable inorganic shell passivated perovskite NCs reported to date. In addition, TiO2 shell coating can effectively suppress anion exchange and photodegradation, therefore dramatically improving the chemical stability and photostability of the core CsPbBr3 NCs. More importantly, photoluminescence and (photo)electrochem-ical characterizations exhibit increased charge separation efficiency due to the electrical conductivity of the TiO2 shell, hence leading to an improved photoelectric activity in water. This study opens new possibilities for optoelectronic and photocatalytic applications of perovskites-based NCs in aqueous phase.
AB - Inherent poor stability of perovskite nanocrystals (NCs) is the main impediment preventing broad applications of the materials. Here, TiO2 shell coated CsPbBr3 core/shell NCs are synthesized through the encapsulation of colloidal CsPbBr3 NCs with titanium precursor, followed by calcination at 300 °C. The nearly monodispersed CsPbBr3/TiO2 core/shell NCs show excellent water stability for at least three months with the size, structure, morphology, and optical properties remaining identical, which represent the most water-stable inorganic shell passivated perovskite NCs reported to date. In addition, TiO2 shell coating can effectively suppress anion exchange and photodegradation, therefore dramatically improving the chemical stability and photostability of the core CsPbBr3 NCs. More importantly, photoluminescence and (photo)electrochem-ical characterizations exhibit increased charge separation efficiency due to the electrical conductivity of the TiO2 shell, hence leading to an improved photoelectric activity in water. This study opens new possibilities for optoelectronic and photocatalytic applications of perovskites-based NCs in aqueous phase.
KW - Charge transport
KW - Core/shell nanoparticles
KW - Functional coatings
KW - Titanium dioxide
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U2 - 10.1002/adfm.201704288
DO - 10.1002/adfm.201704288
M3 - Article
AN - SCOPUS:85032958474
SN - 1057-9257
VL - 28
JO - Advanced Materials for Optics and Electronics
JF - Advanced Materials for Optics and Electronics
IS - 1
M1 - 1704288
ER -