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

EPSCoR研究基础设施改善轨道4:EPSCoR研究人员项目为杰克逊州立大学（JSU）的助理教授提供奖学金，这是一所历史悠久的黑人学院和大学（HBCU）。该项目还将为JSU的一名研究生提供超快光谱学培训机会。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，为JSU研究界扩展超快光谱的专业知识。JSU的研究人员将在Lian小组学习实际操作技能，测量原理，数据收集，数据分析和数据绘图，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，所提出的超快光谱技能和知识只能通过长时间的现场访问获得，这是NSF EPSCoR RII Track-4计划唯一支持的。有了这项新技术，JSU的研究能力将大大提高，更好地了解钙钛矿太阳能电池。通过这个项目，PI的职业轨迹可能会受到积极的影响，并有可能从太阳能电池器件工程转向对光电器件接口的基本理解。JSU和Emory在这个项目上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。NSF EPSCoR RII track4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方面的专业知识，以了解钙钛矿太阳能电池（psc）界面上受有机官能团（OFGs）影响的电荷转移过程。本课题的研究目标包括：1)探讨ofg类型与钙钛矿薄膜缺陷类型的关系，研究ofg类型对电荷输运的影响；2)研究了14种常用OFGs对钙钛矿膜钝化过程中电荷分离、电荷复合和电荷转移过程的详细影响。利用可见光、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，通过钝化钙钛矿薄膜中三种常见的特定缺陷，如有机成分空位、金属空位和碘空位，来研究PSCs中的14个OFGs。本项目将对钙钛矿薄膜缺陷类型与钝化OFG类型之间的关系有一个基本的了解，从而了解基于钙钛矿薄膜缺陷的钝化程序和OFG的选择。本项目还将展示不同OFG对器件中电荷分离、电荷重组和电荷转移过程的影响，这将为器件接口处的电荷传输过程提供新的见解，并通过OFG钝化器件的接口对器件性能有新的认识。该奖项反映了美国国家科学基金会的法定使命，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。

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.