Repurposing low-dimensional hybrid perovskites for the detection of low-energy photons

重新利用低维杂化钙钛矿来检测低能光子

• 批准号: 2313648
• 负责人: Peijun Guo
• 金额: $ 60万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-15 至 2027-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2313648&HistoricalAwards=false
• 关键词: Repurposing; low; dimensional; hybrid; perovskites

Nontechnical DescriptionMetal halide perovskites are a new class of solution-processible semiconductors. These are hybrid materials, using a variety of organic and inorganic components as building blocks. This allows tuning of their optical, electrical and thermal-transport properties for the desired use. They have shown particular promise for use in applications such as solar energy harvesting, displays, and solid-state lighting. This project focuses on understanding the fundamental properties of a sub-class of metal halide perovskites. These two-dimensional (2D) materials consist of interpenetrating organic and inorganic layers arranged by design. The team will study the structure and optical properties of 2D perovskites to gain insight into what governs their thermal conductivity and how charge carriers interact with the crystal lattice. Understanding the unique properties of 2D perovskites will help to evaluate their potential for device applications and accelerate their adoption into advanced device technologies. In particular, the goal is to establish 2D perovskites for detection of infrared led, which has traditionally relied on vapor-phase grown semiconductors that are expensive to process. The project will train graduate and undergraduate students in synthesis and characterization of novel semiconductors, including building and modifying instrumentation.Technical DescriptionThe ability to detect light is crucial in areas ranging from photography and bio-imaging to materials characterization and precision metrology. The difficulty of light detection depends on the energy carried by each photon, the smallest energy quanta of light. While silicon-based detectors are mature and sensitive, the detection of photons whose energies fall below the bandgap of silicon is generally more challenging. The goal of this project is to understand how the thermal conductivity and exciton-lattice interactions of two-dimensional metal halide perovskites can be influenced and ultimately controlled through the type of organic spacers, the intentionally introduced stacking disorders, and the connectivity mode of the inorganic octahedral layers. A variety of techniques, including time-resolved vibrational-pump visible-probe spectroscopy, pump-probe optical imaging, and synchrotron x-ray diffraction, will be employed to characterize the structure-property relationships of judiciously chosen two-dimensional perovskite compositions. The understanding gained will provide a fundamental understanding of the thermal and optical properties of these solution-processable materials and establish the knowledge base to use them for detecting low-energy photons in the near-infrared to the mid-infrared range.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术描述金属卤化物钙钛矿是一类新型的可溶液加工的半导体。这些是混合材料，使用各种有机和无机成分作为构建块。这允许调整它们的光学、电学和热传输特性以达到所需的用途。它们在太阳能收集、显示器和固态照明等应用中显示出特别的前景。该项目的重点是了解金属卤化物钙钛矿子类的基本特性。这些二维 (2D) 材料由按设计排列的相互渗透的有机层和无机层组成。该团队将研究二维钙钛矿的结构和光学特性，以深入了解控制其导热性的因素以及载流子如何与晶格相互作用。了解二维钙钛矿的独特性质将有助于评估其在设备应用中的潜力，并加速其在先进设备技术中的采用。特别是，我们的目标是建立用于检测红外 LED 的 2D 钙钛矿，传统上红外 LED 依赖于加工成本昂贵的气相生长半导体。该项目将培训研究生和本科生学习新型半导体的合成和表征，包括构建和修改仪器。技术描述探测光的能力在从摄影和生物成像到材料表征和精密计量等领域至关重要。光检测的难度取决于每个光子携带的能量，即光的最小能量量子。虽然硅基探测器成熟且灵敏，但检测能量低于硅带隙的光子通常更具挑战性。该项目的目标是了解如何通过有机间隔物的类型、有意引入的堆叠紊乱以及无机八面体层的连接模式来影响并最终控制二维金属卤化物钙钛矿的热导率和激子-晶格相互作用。各种技术，包括时间分辨振动泵可见光探针光谱、泵浦探针光学成像和同步加速器X射线衍射，将用于表征明智选择的二维钙钛矿成分的结构-性能关系。所获得的理解将使人们对这些可溶液加工材料的热和光学特性有一个基本的了解，并建立知识库，以使用它们来检测近红外到中红外范围内的低能光子。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。