RII Track-4:NSF: Understanding Perovskite Solar Cell Passivation at The Level of Organic Functional Groups through Ultrafast Spectroscopy

这个EPSCoR研究基础设施改善轨道-4：EPSCoR研究员项目提供奖学金，以助理教授在杰克逊州立大学（JSU），历史上的黑人学院和大学（HBCU）。该项目还将支持JSU研究生在超快光谱学的培训机会。首席研究员（PI）和研究生将在埃默里大学进行为期六个月的访问，以将专业知识扩展到JSU研究社区的超快光谱学。JSU的研究人员将学习实践技能，测量原理，数据收集，数据分析和数据绘制在连组，以充分了解这种先进的超快光谱技术。由于复杂性和知识深度，拟议的超快光谱技术和知识只能通过扩展的现场访问获得，这是NSF EPSCoR RII Track-4计划的独特支持。通过这项新技术，JSU的研究能力将在更好地了解钙钛矿太阳能电池方面得到显着提高。通过这个项目，PI的职业轨迹可以受到积极的影响，并有可能从太阳能电池器件工程转变为对光电器件接口的基本理解。JSU和埃默里大学通过该项目的密切合作也有利于JSU的其他研究领域，如纳米材料，晶体管，电池和生物材料。这个NSF EPSCoR RII Track-4奖学金项目提供了一个独特的机会，支持PI和JSU的一名研究生访问埃默里大学，以扩展他们在超快光谱学方面的专业知识，以了解受有机官能团（OFG）影响的电荷转移过程在钙钛矿太阳能电池（PSC）的界面。本项目的研究目标包括：1）探索OFG类型与钙钛矿薄膜缺陷类型之间的关系，并研究OFG类型对电荷输运的影响; 2）研究十四种常用OFG在钙钛矿薄膜钝化中对电荷分离、电荷复合和电荷转移过程的具体影响。PSC中的14个OFG将通过钝化钙钛矿薄膜的三种常见的特定类型的缺陷来研究，例如有机组分空位，金属空位和碘空位，使用可见，飞秒和纳秒瞬态吸收光谱，以及纳秒，飞秒和皮秒的时间分辨光致发光。该项目将提供对钙钛矿薄膜缺陷类型与钝化OFG类型之间关系的基本理解，以了解基于钙钛矿薄膜缺陷的钝化程序和OFG选择。不同的光纤光栅对器件中电荷分离、电荷复合和电荷转移过程的影响也将在本项目中展示，这将为界面处的电荷传输过程提供新的见解，并通过OFG钝化对器件界面的器件性能提供新的理解。该奖项反映了NSF的法定使命，并被认为值得通过评估予以支持使用基金会的知识价值和更广泛的影响审查标准。

This EPSCoR Research Infrastructure Improvement Track-4: EPSCoR Research Fellows project provides a fellowship to an Assistant Professor at Jackson State University (JSU), a Historically Black Colleges and Universities (HBCU). The project will also support a JSU graduate student with a training opportunity in ultrafast spectroscopy. The principal investigator (PI) and the graduate student will have a six-month visit at Emory University to extend the expertise to ultrafast spectroscopy for the JSU research community. JSU researchers will learn hands-on skills, measurement principles, data collection, data analysis, and data plotting at Lian group to fully understand this advanced technique of ultrafast spectroscopy. The proposed ultrafast spectroscopy skills and knowledge could only be obtained through an extended on-site visit due to the complexity and the knowledge depth, which is uniquely supported by this NSF EPSCoR RII Track-4 program. With this new technique, the research capacity of the JSU will be significantly enhanced in terms of a better understanding of the perovskite solar cells. Through this project, PI’s career trajectory can be positively impacted and potentially transformed from solar cell device engineering to fundamental understanding of interfaces of optoelectronic devices. The close collaboration between JSU and Emory through this project also benefits other research fields at JSU such as nanomaterials, transistors, batteries, and biomaterials. This NSF EPSCoR RII Track-4 fellowship project provides a unique opportunity to support the PI and one graduate student at JSU to visit Emory University to extend their expertise in ultrafast spectroscopy to understand the charge transfer process affected by organic functional groups (OFGs) at the interfaces in the perovskite solar cells (PSCs). The research goals of this project include: 1) probing the relationship between the types of OFGs and the types of perovskite film defects and investigating the charge transport affected by the types of OFGs; and 2) studying the detailed effects of charge separation, charge recombination, and charge transfer process by fourteen commonly used OFGs in the passivation of the perovskite films. The fourteen OFGs in PSCs will be investigated by passivation of three common specific types of defects of perovskite films such as organic component vacancies, metal vacancies, and iodine vacancies using visible, femtosecond, and nanosecond transient absorption spectra, and time-resolved photoluminescence in nanoseconds, femtoseconds, and picoseconds. This project will provide a fundamental understanding of the relationship between the types of defects of the perovskite films and the types of passivation OFGs to understand the passivation procedures and OFG selection based on the defects of the perovskite films. The influence of different OFGs on the charge separation, charge recombination, and charge transfer processes in the devices will also be demonstrated in this project, which will provide new insights into the charge transport process at the interfaces and a new understanding of the device performance by the interface of the devices via OFG passivation.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.