Unravelling the Abnormal Thermo-Mechanical Behavior of 2D Hybrid Organic-Inorganic Perovskites

揭示二维杂化有机-无机钙钛矿的异常热机械行为

• 批准号: 2311573
• 负责人: Qing Tu
• 金额: $ 33.89万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-06-01 至 2026-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2311573&HistoricalAwards=false
• 关键词: Unravelling; Abnormal; Thermo; Mechanical; Behavior

This award supports research which aims to investigate how temperature influences the mechanical behavior of 2D hybrid organic-inorganic perovskites and uncover the origin of such thermo-mechanical behavior. These materials are burgeoning low-cost, high-performance semiconductor materials with great potential in various energy and electronics applications, including solar cells, transistors, sensors, and flexible electronics. The coexistence of mechanical strain and temperature fluctuations is universally found in such applications and causes mechanical failure issues that significantly hinder commercial viability. However, the thermo-mechanical behavior of 2D hybrid organic-inorganic perovskites remains elusive. This research project will bridge this knowledge gap by systematically measuring the mechanical property change of these materials as a function of temperature using atomic force microscopy. The findings of this research have the potential to extend the lifetime of energy and electronic devices using 2D hybrid organic-inorganic perovskites. Additionally, it can expedite the commercialization of low cost and efficient solar cells made of these materials, greatly facilitating the realization of the US government’s clean energy goals. This project will also provide opportunities to educate and train graduate and undergraduate students at Texas A&M University, a Hispanic Serving Institute, and promote STEM education/careers through on-campus K-12 and community outreach activities. 2D hybrid organic-inorganic perovskites manifest a uniquely different in-plane thermo-mechanical behavior compared to their 3D counterparts or other low-dimensional materials. The overarching goal of this project is to form a fundamental and comprehensive understanding of the thermo-mechanical behavior and unveil the structural origin found in 2D hybrid organic-inorganic perovskites. Advanced scanning probe-based nanomechanical characterization techniques at controlled temperatures will be employed to systematically investigate the temperature-dependent mechanical properties of these materials along both in-plane and out-of-plane directions. The project will test the central hypothesis that the thermal response of the organic spacer molecules and their interfaces give rise to the interesting thermo-mechanical behavior of 2D hybrid organic-inorganic perovskites. The thermal response of the organic spacer molecules will be engineered by tuning the structural parameters of 2D hybrid organic-inorganic perovskites, and directly correlated to the attendant thermo-mechanical behavior of the materials, where the mechanistic explanation will be provided by the interfacial shear strength between the 2D layers measured with friction force microscopy. The research outcomes will offer indispensable insights to engineer, design, and optimize mechanical reliability and the strain-coupled semiconductor performance of 2D hybrid organic-inorganic perovskites across the technologically interested temperature 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.

该奖项支持旨在研究温度如何影响2D杂交有机无机钙钛矿的机械行为并发现这种热力学行为的起源的研究。这些材料是在各种能源和电子应用中具有巨大潜力的低成本，高性能的半导体材料，包括太阳能电池，晶体管，传感器和柔性电子设备。机械应变和温度波动的共存是在这种应用中普遍发现的，并导致机械故障问题显着阻碍了商业生存能力。然而，2D杂交有机 - 无机钙钛矿的热机械行为仍然弹性。该研究项目将通过系统地测量这些材料的机械性能变化作为温度的函数，使用原子力显微镜来弥合这一知识差距。这项研究的发现有可能使用2D杂交有机无机钙钛矿来延长能量和电子设备的寿命。此外，它可以加快由这些材料制成的低成本和高效太阳能电池的商业化，从而极大地支持了美国政府清洁能源目标的实现。该项目还将为德克萨斯A＆M大学，西班牙裔服务学院教育和培训毕业生和本科生提供教育和培训的机会，并通过校园K-12和社区外展活动来促进STEM教育/职业。与3D对应物或其他低维材料相比，2D混合有机无机钙壶表现出一种独特的平面内部机电行为。该项目的总体目标是对热机械行为形成基本和全面的理解，并揭示2D混合有机无机钙钛矿中发现的结构起源。基于探针的高级扫描基于受控温度下的纳米力学特征技术将用于系统地研究这些材料沿面内和面外方向的这些材料的温度依赖性机械性能。该项目将测试中心假设，即有机间隔分子的热响应及其界面会产生2D混合有机无机钙钛矿的有趣热机械行为。有机隔离分子的热响应将通过调整2D混合有机无机钙钛矿的结构参数来设计，并与材料的伴随热机械行为直接相关，其中机械解释将由2D层之间的界面剪切强度通过frictional offiction friction friction friction friction friction friction friction friction friction friction friction offirtical sirtiction sirtical sirtict offictial posecoppoy提供。研究结果将为工程师，设计和优化机械可靠性以及在技术有趣的温度范围内的2D混合有机无机钙钛矿的应变耦合的半导体性能提供必不可少的见解。该奖项反映了NSF的法定任务，反映了NSF的法定任务，并通过使用基金会的范围进行了评估，并通过评估了Crcriatial和Broadia and tocriatial和Broadia and tocriatial and Broadia and crowia and tocria and tocria and tocria and tobrodia and Interviacia and throbia和broadiacia and broadia and robleit。