Pyridine-Induced Dimensionality Change in Hybrid Perovskite Nanocrystals
Pyridine-Induced Dimensionality Change in Hybrid Perovskite Nanocrystals
复制标题
DOI：
10.1021/acs.chemmater.7b00872
复制
发表时间：
2017-05-23
影响因子：
8.6
通讯作者：
Mohammed, Omar F.
中科院分区：
文献类型：
--
作者：
Ahmed, Ghada H.;Yin, Jun;Mohammed, Omar F.
通过仔细操纵表面化学来设计表面能是在纳米晶体生长期间控制量子限制和结构维度的方便方法。在这里，我们证明了在甲基溴化铅铵（MAPbBr（3））钙钛矿纳米晶体的合成过程中引入吡啶可以将三维（3D）立方体转化为二维（2D）纳米结构。密度泛函理论（DFT）计算表明，吡啶优先结合到铅原子终止的表面，驱动选择性的二维生长的纳米结构。这些2D纳米结构表现出强的量子限制效应，在可见光谱范围内的高光致发光量子产率，以及有效的电荷转移到分子受体。这些品质表明合成的2D纳米结构适用于广泛的光电应用。
Engineering the surface energy through careful manipulation of the surface chemistry is a convenient approach to control quantum confinement and structure dimensionality during nanocrystal growth. Here, we demonstrate that the introduction of pyridine during the synthesis of methylammonium lead bromide (MAPbBr(3)) perovskite nanocrystals can transform three-dimensional (3D) cubes into two-dimensional (2D) nanostructures. Density functional theory (DFT) calculations show that pyridine preferentially binds to Pb atoms terminating the surface, driving the selective 2D growth of the nanostructures. These 2D nanostructures exhibit strong quantum confinement effects, high photoluminescence quantum yields in the visible spectral range, and efficient charge transfer to molecular acceptors. These qualities indicate the suitability of the synthesized 2D nanostructures for a wide range of optoelectronic applications.