Catalyst Project: Age and temperature-dependent millimeter-wave charge carrier dynamics in hybrid perovskite films

催化剂项目：混合钙钛矿薄膜中与年龄和温度相关的毫米波载流子动力学

• 批准号: 2200518
• 负责人: Marvin Wu
• 金额: $ 15万
• 依托单位: North Carolina Central University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-15 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2200518&HistoricalAwards=false
• 关键词: Catalyst; Project; Age; temperature; dependent

Catalyst Projects provide support for Historically Black Colleges and Universities (HBCU) to work towards establishing research capacity of faculty to strengthen science, technology, engineering, and mathematics (STEM) undergraduate education and research. It is expected that the award will further the faculty member's research capability, improve research and teaching at the institution, and involve undergraduate students in research experiences. This award to North Carolina Central University supports faculty and undergraduate research experiences investigating the effects of aging and temperature on hybrid organic-inorganic perovskites to predict charge carrier density. Specifically, the project seeks to utilize high-throughput testing and a machine learning algorithm for data analyses to understand aging related stability and the causes of degradation of organometallic halide perovskites.Perovskite in 3-D form is a very attractive material for applications such as a field-effect transistor (FET), light-emitting diodes (LED), photo- and radiation detection, scintillation, biochemical applications, and has direct industrial application for hydrogen production. Since monomolecular (trap-assisted) recombination trends in methylammonium lead-halide (MAL3I) and its cation engineered variants can be directly measured using the time-resolved microwave conductivity (TRMC) measurements, this project aims to use a free-space time-resolved millimeter-wave conductivity apparatus (TR-mmWC), developed at NCCU, to observe the age-peak voltage and non-radiative age-recombination decay trends in MAL3I and its structural variants at different exposure temperature regimes. The experimental data collection and analysis will help inform two questions: (1) Does the sample develop shallow defects over time for a better charge transport with aging, or does the reverse process hold? and (2) How do the positive peak and negative photoconductivity behave in an hybrid organic (MA) – inorganic (L3I) system? These studies have the potential to reveal the frequency dependence of electromagnetic interaction with material dielectric properties and conductivity, and the systematical collection of frequency-swept absorption profiles in a large temperature range, demonstrating how the charge dynamical properties at millimeter-wave frequencies change by age at different temperatures.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.

催化剂项目为历史上的黑人学院（HBCU）提供了支持，以努力建立教师的研究能力，以增强科学，技术，工程和数学（STEM）本科教育和研究。可以预期，该奖项将进一步进一步促进教职员工的研究能力，改善机构的研究和教学，并让本科生参与研究经验。该奖项授予北卡罗来纳州中央大学，支持教师和本科研究经验，研究了衰老和温度对混合有机无机钙钛矿的影响，以预测电荷载体密度。 Specifically, the project seeks to utilize high-throughput testing and a machine learning algorithm for data analyses to understand aging related stability and the causes of degradation of organic halide perovskites.Perovskite in 3-D form is a very attractive Material for applications such as a field-effect transistor (FET), light-emitting speech (LED), photo- and radiation detection, scintillation, biochemical应用，并具有直接的氢生产工业应用。 Since monomolecular (trap-assisted) recombination trends in methylammonium lead-halide (MAL3I) and its cation engineered variants can be directly measured using the time-resolved microwave conductivity (TRMC) measurements, this project aims to use a free-space time-resolved millimeter-wave conductivity apparatus (TR-mmWC), developed at NCCU, to observe the age-peak voltage MAL3I及其在不同暴露温度方案下的结构变异的非辐射性年龄衰变趋势。实验数据收集和分析将有助于提出两个问题：（1）样本开发随着时间的推移会随着时间的推移而造成的较浅的缺陷，以通过老化的衰老来更好地运输电荷，还是反向过程成立？ （2）在杂交有机（MA） - 无机（L3I）系统中，正峰和负光电导率如何？这些研究具有揭示电磁相互作用与材料动态特性和电导率的频率依赖性，以及在较大温度范围内的频率扫描抽象曲线的系统收集，证明了毫米波频率的电荷动态性能如何按年龄在不同的温度下随着年龄而变化。这些奖项通过不同的智力进行了良好的智力，并依靠NSF的智力梅尔特（NSF）的支持，并依赖于成立的智力，并依赖于建立良好的支持。 标准。