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 Å. 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.

中文翻译：

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使用二维卤化钙钛矿超晶格的可扩展光子源。

基于半导体二维（2D）材料的微型光子源提供了超越现代III-V平台的新技术机遇。例如，量子受限的二维电子结构将激子跃迁偶极矩平行于表面平面对齐，从而将更多的光与空气耦合，从而产生了高效的量子光学器件和电致发光器件。它需要可伸缩的材料和工艺来创建解耦的多量子阱超晶格，其中单个2D材料层被原子薄的量子势垒隔离。在这里，我们报告解耦的多量子阱超晶格由卤化钙钛矿的胶体量子阱组成，具有前所未有的超薄量子势垒，可屏蔽6.5范围内的层间相互作用。