Molecular engineering of organic-inorganic hybrid perovskites quantum wells
Molecular engineering of organic-inorganic hybrid perovskites quantum wells
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DOI：
10.1038/s41557-019-0354-2
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发表时间：
2019-12-01
期刊：
影响因子：
21.8
通讯作者：
Dou, Letian
中科院分区：
文献类型：
--
作者：
Gao, Yao;Shi, Enzheng;Dou, Letian
半导体量子阱结构和超晶格是现代光电子学中的关键构件，但是难以同时实现无缺陷外延生长，同时微调每层的化学成分、层厚度和能带结构以实现期望的性能。在这里，我们展示了调制的电子结构，从而光学性能的有机半导体构建块，通过一个简单的解决方案处理步骤之间的钙钛矿层。共轭的有机分子的自聚集被抑制功能化与空间要求的基团和单晶有机钙钛矿混合量子威尔斯（下至一个单元电池厚）获得。相邻的有机和无机层之间的能量和电荷转移被证明是快速和有效的，由于原子级平坦的界面和超小的层间距离的钙钛矿材料。由于大体积疏水有机基团的保护，所得的二维杂化钙钛矿非常稳定。
Semiconductor quantum-well structures and superlattices are key building blocks in modern optoelectronics, but it is difficult to simultaneously realize defect-free epitaxial growth while fine tuning the chemical composition, layer thickness and band structure of each layer to achieve the desired performance. Here we demonstrate the modulation of the electronic structure-and consequently the optical properties-of organic semiconducting building blocks that are incorporated between the layers of perovskites through a facile solution processing step. Self-aggregation of the conjugated organic molecules is suppressed by functionalization with sterically demanding groups and single crystalline organic-perovskite hybrid quantum wells (down to one-unit-cell thick) are obtained. The energy and charge transfers between adjacent organic and inorganic layers are shown to be fast and efficient, owing to the atomically flat interface and ultrasmall interlayer distance of the perovskite materials. The resulting two-dimensional hybrid perovskites are very stable due to protection given by the bulky hydrophobic organic groups.