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Molecular Engineering of Hybrid Perovskites Quantum Wells for Nano-Photonics

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[Technical Report, Final Report]

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University of Washington

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Breakthroughs in science and technologies often come with the discovery of new material systems with advancement in synthesis methods. An outstanding example is the development of quantum wells QWs and heterostructures made of three dimensional semiconductors, which have provided the foundation for repeated breakthroughs in key solid-state device technologies, such as light-emitting diodes, diode lasers, photovoltaics and many optoelectronic components. The goal of this project is to elucidate the processing, structure, function relationships of two-dimensional 2D layered perovskites and their heterostructures to enable them to serve as advanced optoelectronic materials. 2D layered perovskites represent a new class of low-dimensional semiconductors that offer unprecedented possibilities for technological applications in nanoelectronics and nanophotonics, which can be used by Air Force to improve our national securities and peacekeeping capabilities. The advantages of 2D hybrid layered perovskites arise from their intrinsic material structure, which comprises alternating organic and inorganic layers to form an extended ordered structure naturally. The organic and inorganic parts in such hybrid perovskites contributes very differently to the overall physical properties of the material, permitting one to separately tune the organic and inorganic contributions to the overall optoelectronic properties, but also making the chemistry, processing, and function relationship of 2D layered perovskites subtly different from either purely organic or purely inorganic materials. In this project, we have systematically studied the effect of organic spacer cations on the optoelectronic properties and device performance using the 2D layered perovskites. We observed that both larger and more hydrophobic organic cations can improve perovskite stability against moisture, while larger size can adversely influence the device performance.


Subject Categories:

  • Quantum Theory and Relativity
  • Fiber Optics and Integrated Optics
  • Atomic and Molecular Physics and Spectroscopy

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[A, Approved For Public Release]