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Gao, Yao; Shi, Enzheng; Deng, Shibin; Shiring, Stephen B; Snaider, Jordan M; Liang, Chao; Yuan, Biao; Song, Ruyi; Janke, Svenja M; Liebman-Peláez, Alexander; Yoo, Pilsun; Zeller, Matthias; Boudouris, Bryan W; Liao, Peilin; Zhu, Chenhui; Blum, Volker; Yu, Yi; Savoie, Brett M; Huang, Libai; Dou, Letian
Nature chemistry, 12/2019, Letnik: 11, Številka: 12Journal Article
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.
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