期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-019-14084-3
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资金
- ETH
- ETH [ETH-33 18-2]
- Swiss National Science Foundation [200021178944]
- European Research Council [N849229 CQWLED]
- EPSRC [EP/P020267/1, ec019, EP/P020194/1]
- University of Edinburgh
- Queen's Fellow Award [M8407MPH]
- Department for the Economy [USI 097]
- Advanced Research Center for Green Materials Science and Technology from The Featured Area Research Center Program [108L9006]
- Ministry of Science and Technology in Taiwan [MOST 108-3017-F-002-002, 108-2221-E-011 -047]
- EPSRC [EP/P022626/1, EP/P020194/1] Funding Source: UKRI
Miniaturized photonic sources based on semiconducting two-dimensional (2D) materials offer new technological opportunities beyond the modern III-V platforms. For example, the quantum-confined 2D electronic structure aligns the exciton transition dipole moment parallel to the surface plane, thereby outcoupling more light to air which gives rise to high-efficiency quantum optics and electroluminescent devices. It requires scalable materials and processes to create the decoupled multi-quantum-well superlattices, in which individual 2D material layers are isolated by atomically thin quantum barriers. Here, we report decoupled multi-quantum-well superlattices comprised of the colloidal quantum wells of lead halide perovskites, with unprecedentedly ultrathin quantum barriers that screen interlayer interactions within the range of 6.5 angstrom. Crystallographic and 2D k-space spectroscopic analysis reveals that the transition dipole moment orientation of bright excitons in the superlattices is predominantly in-plane and independent of stacking layer and quantum barrier thickness, confirming interlayer decoupling.
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