院士大讲堂
报告题目： Are exciton dynamics in thin films representative of actual solar cells? Addressing the question using artifact-free ultrafast 2D photocurrent spectroscopy
报告时间：2025-12-03 09:00
报告人： Martin T. Zanni 院士
威斯康星大学麦迪逊分校
报告地点：化学楼234会议室
转播地点：翔安校区能源材料大楼3号楼会议室5，漳州校区生化主楼307教室
报告摘要：
The performance of many photoactive devices is impacted by the dynamics of excitons within the photoactive layer. Typically, these dynamics are deduced by independently conducted transient absorption measurements on films outside of the devicyee with the assumption that the photophysics in free standing films inform the photophysics of the film inside the device. But there are interfaces in devices that are not present in films and the morphology and atomic packing might be impact by device construction. Moreover, photoabsorption experiments measure all excitons whereas the best photovoltaic devices are perhaps 20% efficient, meaning that only 1 in 5 excitons actually produce electricity. Thus, the conclusions drawn from free standing films might not be directly relevant to devices. This talk will cover results made possible by new advances in ultrafast 2D photocurrent spectroscopy that enable ultrafast exciton dynamics to be directly compared between films and devices. In photovoltaics made from semiconducting carbon nanotubes, we find that the conclusions drawn from the ultrafast photocurrent measurements are very different from those we had drawn from films, leading us to reinterpret long standing experiments and reevaluate our goals for device architecture.
报告人简介：
Martin T. Zanni is the F. Fleming Crim Professor and Meloche-Bascom Professor of Chemistry at the University of Wisconsin-Madison. He received his PhD from the University of California-Berkeley, working with Dan Neumark, and was an NIH Postdoctoral Fellow at the University of Pennsylvania with Robin Hochstrasser. He is one of the early pioneers of 2D IR spectroscopy and has made many technological innovations that have broadened the capabilities and scope of multidimensional spectroscopies and microscopies. He utilizes these new techniques to study topics in biophysics, chemical physics, photovoltaics, and surfaces. He has received many national and international accolades for his research. Notably, he is the only person to have received the ACS Nobel Laureate Signature Award as both a student and a mentor and the first person to receive the Craver, Coblentz, and Lippincott Awards. He founded PhaseTech Spectroscopy Inc., which is the first company to commercialize 2D IR and 2D Electronic spectroscopies. He was elected into the National Academy of Sciences in 2025. He also has 15 years of experience as an editor. He was a Senior Editor with the Journal of Physical Chemistry from 20011-2019, Deputy Editor of JPC B from 2020-2023, and is now an Associated Editor with Chemical Reviews.
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