On May 30, 2023, the Photonic Nose and Molecular Materials Group invited researcher Ren Zefeng from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, to give a report to group members in the Lecture Hall of the Institute of New Concept Sensors and Molecular Materials building. The report was hosted by Prof. Bian Hongtao, and attended by group teachers, doctoral and master’s students.

Ren’s research group has recently developed two ultrafast spectroscopic techniques: 1. Using time-resolved optical emission electron microscopy (PEEM) to study the carrier dynamics of single-particle photocatalysts; 2. Using highly sensitive transient absorption spectroscopy to study the carrier dynamics of perovskite solar cell materials under sunlight, which is crucial to understanding the properties and dynamics of photogenerated carriers of semiconductor materials, solar cells and photocatalysis. The combination of ultrafast laser and PEEM can study the performance of semiconductor materials from multiple dimensions such as time resolution, spatial resolution, and electron energy/momentum resolution, realize the carrier dynamics of a single Cu2O photocatalytic particle, and promote the understanding of the photoelectron-hole dynamics of photocatalyst materials in different crystal planes of Cu2O. In addition, Ren also briefly introduced the highly sensitive transient absorption spectroscopy technology developed by them, which has important guiding significance for the synthesis of solar cell materials and the preparation of devices.

After the report, Ren discussed with the teachers and students present about his report content, and took a photo with them.