Subject：Growth and Assembly of Advanced Shaped Perovskite Nanocrystals for Photoelectronic Applications
Emcee：Dr. Weiwei Zheng
Time：3:00pm, 22th July, 2019
Place：Science Building A814
Abstract：
Inorganic halide perovskites are fantastic materials and have wide applications in solar cells, LEDs, photo-catalysis, and etc.
Shape control is critical and offers an efficient way to tune the properties of nanocrystals (NCs). We present the surface ligand-mediated assembly of 1 dimensional (1D) nanorods is highly effective for producing 2D nanoplatelets (NPLs) and nanosheets (NSs). The present work provides a general strategy
for rational fabrication of 2D CsPbX3 (X = Cl, Br, I) perovskite NCs without the assistance of anion exchange. The broad lateral size range of the 2D perovskite NCs from ~100 nm up to ~1 μm can provide great opportunities in practical photovoltaic applications.
For optoelectronic and photocatalytic applications of perovskite NCs in aqueous phase, TiO2 shell coated CsPbBr3 core/shell NCs were synthesized. The core/shell NCs show excellent water stability for at least 3 months,which represent the most water-stable inorganic shell passivated perovskite NCs reported to date. More importantly, the core/shell NCs exhibit increased charge separation efficiency due to the electrical conductivity of the TiO2 shell, hence leading to an improved photoelectric activity in water.
