CAREER: Synthesis of Emerging Chalcogenide and Chalcohalide Semiconductor Nanomaterials

职业：新兴硫族化物和硫卤化物半导体纳米材料的合成

• 批准号: 2237082
• 负责人: Sidney Creutz
• 金额: $ 65.29万
• 依托单位: Mississippi State 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: 2023-04-01 至 2028-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2237082&HistoricalAwards=false
• 关键词: CAREER; Synthesis; Emerging; Chalcogenide; Chalcohalide

Non-Technical SummaryMany modern technologies rely on semiconductor materials for their function. For example, solar cells use semiconductors to absorb light and generate electricity. Scientists and engineers are continuously working to improve the efficiency and cost-effectiveness of solar cells to help decrease global dependence on non-renewable energy sources. Many promising new semiconductor materials have been proposed based on computations. Some of the materials that have been predicted to have excellent properties have been, so far, difficult to synthesize under the mild conditions that would make it possible to incorporate them into devices. This includes a class of materials known as chalcogenide perovskites, and certain other materials which contain mixtures of halide and chalcogenide ions. Through this award, jointly funded by the Solid State and Materials Chemistry program in the Division of Materials Research and the Established Program to Stimulate Competitive Research (EPSCoR) at NSF, Prof. Sidney Creutz is developing new methods to make some of these materials on the nanoscale under relatively mild conditions and is studying their electronic and optical properties to better understand their potential applicability in solar cells and other devices. Undergraduate and graduate students are trained in materials chemistry and gain exposure to alternative energy concepts, contributing to the development of a green energy workforce. This includes the development of a materials chemistry bootcamp to introduce new undergraduate students to research in this area. Additionally, outreach is carried out to high school students in the state of Mississippi to increase awareness about and interest in chemistry and its relationship to energy. Technical Summary There is a critical need for the development of new potential photovoltaic materials that may help spur the widespread global adoption of solar energy. With this CAREER project, Prof. Creutz will develop new synthetic approaches to emerging semiconductor nanomaterials, and to probe the properties of the resulting materials using a range of spectroscopic and chemical approaches. This work focuses on two general classes of materials: chalcogenide perovskites and chalcohalides, including split-anion perovskites. The first major objective is to study in detail the structure and optoelectronic properties (including luminescence and tunable absorbance) of nanocrystals of the chalcogenide perovskite barium zirconium sulfide and the related material barium titanium sulfide. The second major objective is to extend these synthetic methods to several classes of closely related materials that have been proposed to have promising optoelectronic properties, including alloys, layered phases, rare earth chalcogenide perovskites, and doped materials. The third major objective is to develop new synthetic approaches to mixed-anion chalcohalide materials, focused on a detailed fundamental understanding of heterovalent anion exchange between chalcogenides and halides. Integrated with these research objectives is an educational program targeted at K-12 students and early undergraduates, focused on increasing interest and achievement in materials science and chemistry, especially related to applications in energy and sustainability, through activities and outreach programs at local high schools and an intensive materials chemistry bootcamp to prepare new undergraduates for research positions.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.

许多现代技术依赖于半导体材料来实现其功能。 例如，太阳能电池使用半导体来吸收光并发电。 科学家和工程师正在不断努力提高太阳能电池的效率和成本效益，以帮助减少全球对不可再生能源的依赖。 许多有前途的新型半导体材料已经在计算的基础上提出。 到目前为止，一些被预测具有优异性能的材料很难在温和的条件下合成，从而有可能将它们纳入设备中。 这包括一类被称为硫属钙钛矿的材料，以及含有卤化物和硫属离子的混合物的某些其他材料。通过这个奖项，由材料研究部的固态和材料化学计划以及NSF的刺激竞争研究（EPSCoR）的既定计划共同资助，Sidney Creutz教授正在开发新的方法，在相对温和的条件下在纳米级上制造这些材料，并正在研究它们的电子和光学特性，以更好地了解它们在太阳能电池中的潜在适用性，其他设备. 本科生和研究生接受材料化学方面的培训，并接触替代能源概念，为绿色能源劳动力的发展做出贡献。 这包括材料化学训练营的发展，介绍新的本科生在这一领域的研究。 此外，还向密西西比州的高中生开展外联活动，以提高他们对化学及其与能源关系的认识和兴趣。 目前迫切需要开发新的潜在光伏材料，这可能有助于刺激全球广泛采用太阳能。 通过这个职业项目，Creutz教授将开发新兴半导体纳米材料的新合成方法，并使用一系列光谱和化学方法来探测所得材料的特性。这项工作的重点是两个一般类别的材料：硫属钙钛矿和硫属卤化物，包括分裂阴离子钙钛矿。第一个主要目标是详细研究硫属钙钛矿钡锆硫化物和相关材料钡钛硫化物的纳米晶体的结构和光电性质（包括发光和可调吸收）。 第二个主要目标是将这些合成方法扩展到几类密切相关的材料，这些材料已被提出具有有前途的光电性能，包括合金，层状相，稀土硫属钙钛矿和掺杂材料。 第三个主要目标是开发新的合成方法，混合阴离子的硫卤材料，专注于详细的基本理解硫族化物和卤化物之间的杂价阴离子交换。与这些研究目标相结合的是一个针对K-12学生和早期本科生的教育计划，重点是提高材料科学和化学的兴趣和成就，特别是与能源和可持续性应用有关的兴趣和成就。通过当地高中的活动和推广计划以及强化材料化学训练营，为新的本科生提供研究职位。该奖项反映了NSF的法定使命并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。