期刊
CRYSTENGCOMM
卷 22, 期 10, 页码 1853-1857出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ce01826c
关键词
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资金
- Key Program for International Science and Technology Cooperation Projects of Shaanxi Province [2018KWZ-08]
- National Natural Science Foundation of China [NSFC 61904148]
- Key Research and Development Program of Shaanxi Province [2018GY-025]
- Special Scientific Research Project of Education Department of Shaanxi Province [17JK0756]
- Hongwu Weng Original Research Foundation of Peking University
Here, we present that the shape and optical properties of CsPbBr3 nanocrystals (NCs) could be tuned by addition of various hydrohalic acids (HX, X = Cl, Br, I). The addition of hydrochloric acid (HCl) and hydrobromic acid (HBr) turns the nanocrystals from nanocubes (NCUs) to quantum dots (QDs). The optical properties are regulated by the composition and quantum confinement effect, while the hydrobromic acid (HBr) addition results in nanosheets (NSs), without a photoluminescence (PL) peak shift. Based on various characteristics, we speculate that the addition of HX leads to protonation of oleylamine from oleylamine into oleylammonium cations that compete with Cs+ during crystallization. The oleylammonium cations at the growing surface of NCs block further growth in the favored direction. Our study provides a facile strategy for tuning and manipulating the shape, size, and optical properties of all-inorganic CsPbX3 NCs and aids in the further exploration of the growth mechanism of perovskite NCs.
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