报告题目：From GaN Laser Diodes to Contact Electrification Induced Interface Spectroscopy
报告人：李丁 副研究员（中国科学院大学/中国科学院北京纳米能源与系统研究所）
报告时间：2025年5月9日（周五）14:00-15:30
报告地点：北洋园校区49教410室
报告摘要：
I would cherish this chance to report to my Alma Mater with the discoveries I have made after my graduation in Tianjin University. The multiphase interatomic electron transfer and GaN laser diodes as carriers to introduce their developments in Piezo-optoelectronics, and Contact Electrification Induced Interface Spectroscopy (CEIIS), covering from basic principles to typical field applications. Firstly, I will introduce the developments on GaN laser diodes and their relations with Piezo-optoelectronics Effects. Next, I will focus on an emerging field – CEIIS. We observed the atomic featured photon emission spectra during CE between two solid materials for the first time. The photon emissions are the evidences that electrons transfer takes place at the interface from one atom in one material to another atom in the other material during CE. It conveys a wealth of information about the energy structure at the interface and naturally paves a way to a spectroscopy corresponding to the contact-electrification at an interface, which might have fundamental impacts to understand the interaction among solids, liquids and gases. Although we only focused on photon emission in CE for solid-solid case in this study, it could be expanded to Auger electron excitation, X-ray emission and electron emission in CE for general cases, which remain to be explored.
报告人简介：
中国科学院大学/中国科学院北京纳米能源与系统研究所博士生导师、副研究员。2006年在天津大学获得理学学士和文学学士双学位；2012年在北京大学获得理学博士学位；2010年1月至2010年7月是美国亚利桑那州立大学访问学者；2012年至2014年在北京大学物理学院从事博士后研究工作；2014年至2017年在德国莱布尼茨联合会费迪南德布劳恩研究所（Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH), Germany）从事博士后研究；2017年8月至今加入中国科学院北京纳米能源与系统研究所担任副研究员。中国科学院高层次引进人才，北京市特聘专家。主要研究方向：宽禁带半导体/半导体光电学、界面光谱学、压电光电子学及其应用。
参考文献：
1. D Li, C Xu, Y J Liao, W Z Cai, Y Q Zhu, Z L Wang. Interface inter-atomic electron-transition induced photon emission in contact-electrification. SCIENCE ADVANCES. 2021, 7(39): eabj0349.
2. Z L Wang W Wu. Recent advances in piezotronics and piezo‑phototronics. MRS BULLETIN. 2025, 50: 115.
3. S Lin, Z L Wang. The Tribovoltaic Effect. MATERIALS TODAY. 2022, 62:111.
