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[资源] 最新nature文章量子点复合钙钛矿材料Quantum-dot-in-perovskite solids

题目：Quantum-dot-in-perovskite solids
作者：Zhijun Ning1*, Xiwen Gong1*, Riccardo Comin1*, GrantWalters1, Fengjia Fan1, Oleksandr Voznyy1, Emre Yassitepe1,
Andrei Buin1, Sjoerd Hoogland1 & Edward H. Sargent1
摘要：Heteroepitaxy—atomically aligned growth of a crystalline filmatop a different crystalline substrate—is the basis of electrically driven
lasers, multijunction solar cells, and blue-light-emitting diodes1–5. Crystalline coherence is preserved even when atomic identity is
modulated, a fact that is the critical enabler of quantum wells, wires, and dots6–10. The interfacial quality achieved as a result of heteroepitaxial
growth allows new combinations of materials with complementary properties, which enables the design and realization of functionalities that are not available in the single-phase constituents. Herewe showthat organohalide perovskites and preformed colloidal quantum dots, combined in the solution phase, produce epitaxially
aligned ‘dots-in-a-matrix’ crystals. Using transmission electron microscopy and electron diffraction,we reveal heterocrystals as large as about 60 nanometres and containing at least 20 mutually aligned dots that inherit the crystalline orientation of the perovskite matrix. The heterocrystals exhibit remarkable optoelectronic properties
that are traceable to their atom-scale crystalline coherence: photoelectrons and holes generated in the larger-bandgap perovskites are transferred with 80% efficiency to become excitons in the quantum dot nanocrystals, which exploit the excellent photocarrier diffusion of perovskites to produce bright-light emission
from infrared-bandgap quantum-tuned materials. By combining the electrical transport properties of the perovskite matrix with the
high radiative efficiency of the quantum dots, we engineer a new platform to advance solution-processed infrared optoelectronics.
发表时间：2 0 1 5年7月16日
不同材质材料连接一直存在难点。该group设计出了一种方法，能让两种晶体结构在原子末端相连，从而保证它们能够顺利对齐，实现无缺陷的无缝结合。钙钛矿材料可以通过溶解的方法来生产，允许电子在最小损耗的情况下快速移动，而量子点则能高效发光。两者强强结合，互利互补，实现了效率的最大化。

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